This patch will make all print functions receive the fp, add the 
fp_selection_helper
function to select the fp(stdout or the dump_event fp) and open the dump file 
for
all print functions. When the perf script is over, closes the dump_event file 
and
calculate its size.

Changes since v3:
- free the evsel->priv by zfree()

Changes since v2:
- remove the file_name variable and get the data file name from struct 
perf_session
- remove the per_event_dump_file variable and get the dump_event fp from struct
 perf_evsel
- add the fp_selection_helper function to select the fp(stdout or the dump_event
 fp) and open the dump file for all print functions if evname and last evsel 
name is not
 the same.
- close the dump file for all the evsels and calculate the dump file's size at 
the end of
 the perf script.
- solve the segmentation fault generated by perf script --per-event-dump 
--show-mmap-events

Changes since v1:
- modify the dump file name to <ORIGINAL PERF DATA FILE 
NAME>-script-dump-<EVENT NAME>.txt
 ect. perf.data-script-dump-cycles.txt, perf.data-script-dump-cs.txt
- split the original patch(Make all those related functions receive the file 
pointer)
 to two patches, and this is the second part of the original one.

Signed-off-by: yuzhoujian <yuzhouj...@didichuxing.com>
---
 tools/perf/builtin-script.c | 438 +++++++++++++++++++++++++-------------------
 tools/perf/util/session.c   |  20 +-
 2 files changed, 273 insertions(+), 185 deletions(-)

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 8c297f0..b49d380 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -501,7 +501,7 @@ static int perf_session__check_output_opt(struct 
perf_session *session)
 }
 
 static void fprint_sample_iregs(struct perf_sample *sample,
-                         struct perf_event_attr *attr, FILE *fp __maybe_unused)
+                         struct perf_event_attr *attr, FILE *fp)
 {
        struct regs_dump *regs = &sample->intr_regs;
        uint64_t mask = attr->sample_regs_intr;
@@ -512,12 +512,12 @@ static void fprint_sample_iregs(struct perf_sample 
*sample,
 
        for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
                u64 val = regs->regs[i++];
-               fprintf(stdout, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
+               fprintf(fp, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
        }
 }
 
 static void fprint_sample_uregs(struct perf_sample *sample,
-                         struct perf_event_attr *attr, FILE *fp __maybe_unused)
+                         struct perf_event_attr *attr, FILE *fp)
 {
        struct regs_dump *regs = &sample->user_regs;
        uint64_t mask = attr->sample_regs_user;
@@ -526,17 +526,17 @@ static void fprint_sample_uregs(struct perf_sample 
*sample,
        if (!regs || !regs->regs)
                return;
 
-       fprintf(stdout, " ABI:%" PRIu64 " ", regs->abi);
+       fprintf(fp, " ABI:%" PRIu64 " ", regs->abi);
 
        for_each_set_bit(r, (unsigned long *) &mask, sizeof(mask) * 8) {
                u64 val = regs->regs[i++];
-               fprintf(stdout, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
+               fprintf(fp, "%5s:0x%"PRIx64" ", perf_reg_name(r), val);
        }
 }
 
 static void fprint_sample_start(struct perf_sample *sample,
                               struct thread *thread,
-                              struct perf_evsel *evsel, FILE *fp 
__maybe_unused)
+                              struct perf_evsel *evsel, FILE *fp)
 {
        struct perf_event_attr *attr = &evsel->attr;
        unsigned long secs;
@@ -544,25 +544,25 @@ static void fprint_sample_start(struct perf_sample 
*sample,
 
        if (PRINT_FIELD(COMM)) {
                if (latency_format)
-                       fprintf(stdout, "%8.8s ", thread__comm_str(thread));
+                       fprintf(fp, "%8.8s ", thread__comm_str(thread));
                else if (PRINT_FIELD(IP) && symbol_conf.use_callchain)
-                       fprintf(stdout, "%s ", thread__comm_str(thread));
+                       fprintf(fp, "%s ", thread__comm_str(thread));
                else
-                       fprintf(stdout, "%16s ", thread__comm_str(thread));
+                       fprintf(fp, "%16s ", thread__comm_str(thread));
        }
 
        if (PRINT_FIELD(PID) && PRINT_FIELD(TID))
-               fprintf(stdout, "%5d/%-5d ", sample->pid, sample->tid);
+               fprintf(fp, "%5d/%-5d ", sample->pid, sample->tid);
        else if (PRINT_FIELD(PID))
-               fprintf(stdout, "%5d ", sample->pid);
+               fprintf(fp, "%5d ", sample->pid);
        else if (PRINT_FIELD(TID))
-               fprintf(stdout, "%5d ", sample->tid);
+               fprintf(fp, "%5d ", sample->tid);
 
        if (PRINT_FIELD(CPU)) {
                if (latency_format)
-                       fprintf(stdout, "%3d ", sample->cpu);
+                       fprintf(fp, "%3d ", sample->cpu);
                else
-                       fprintf(stdout, "[%03d] ", sample->cpu);
+                       fprintf(fp, "[%03d] ", sample->cpu);
        }
 
        if (PRINT_FIELD(TIME)) {
@@ -571,11 +571,11 @@ static void fprint_sample_start(struct perf_sample 
*sample,
                nsecs -= secs * NSEC_PER_SEC;
 
                if (nanosecs)
-                       fprintf(stdout, "%5lu.%09llu: ", secs, nsecs);
+                       fprintf(fp, "%5lu.%09llu: ", secs, nsecs);
                else {
                        char sample_time[32];
                        timestamp__scnprintf_usec(sample->time, sample_time, 
sizeof(sample_time));
-                       fprintf(stdout, "%12s: ", sample_time);
+                       fprintf(fp, "%12s: ", sample_time);
                }
        }
 }
@@ -592,7 +592,7 @@ static void fprint_sample_start(struct perf_sample *sample,
 static void fprint_sample_brstack(struct perf_sample *sample,
                                 struct thread *thread,
                                 struct perf_event_attr *attr,
-                                FILE *fp __maybe_unused)
+                                FILE *fp)
 {
        struct branch_stack *br = sample->branch_stack;
        struct addr_location alf, alt;
@@ -612,21 +612,21 @@ static void fprint_sample_brstack(struct perf_sample 
*sample,
                        thread__find_addr_map(thread, sample->cpumode, 
MAP__FUNCTION, to, &alt);
                }
 
-               fprintf(stdout, " 0x%"PRIx64, from);
+               fprintf(fp, "0x%"PRIx64, from);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alf.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alf.map, fp);
+                       fprintf(fp, ")");
                }
 
-               fprintf(stdout, "/0x%"PRIx64, to);
+               fprintf(fp, "/0x%"PRIx64, to);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alt.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alt.map, fp);
+                       fprintf(fp, ")");
                }
 
-               fprintf(stdout, "/%c/%c/%c/%d ",
+               fprintf(fp, "/%c/%c/%c/%d ",
                        mispred_str( br->entries + i),
                        br->entries[i].flags.in_tx? 'X' : '-',
                        br->entries[i].flags.abort? 'A' : '-',
@@ -637,7 +637,7 @@ static void fprint_sample_brstack(struct perf_sample 
*sample,
 static void fprint_sample_brstacksym(struct perf_sample *sample,
                                    struct thread *thread,
                                    struct perf_event_attr *attr,
-                                   FILE *fp __maybe_unused)
+                                   FILE *fp)
 {
        struct branch_stack *br = sample->branch_stack;
        struct addr_location alf, alt;
@@ -661,20 +661,20 @@ static void fprint_sample_brstacksym(struct perf_sample 
*sample,
                if (alt.map)
                        alt.sym = map__find_symbol(alt.map, alt.addr);
 
-               symbol__fprintf_symname_offs(alf.sym, &alf, stdout);
+               symbol__fprintf_symname_offs(alf.sym, &alf, fp);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alf.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alf.map, fp);
+                       fprintf(fp, ")");
                }
-               fputc('/', stdout);
-               symbol__fprintf_symname_offs(alt.sym, &alt, stdout);
+               fputc('/', fp);
+               symbol__fprintf_symname_offs(alt.sym, &alt, fp);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alt.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alt.map, fp);
+                       fprintf(fp, ")");
                }
-               fprintf(stdout, "/%c/%c/%c/%d ",
+               fprintf(fp, "/%c/%c/%c/%d ",
                        mispred_str( br->entries + i),
                        br->entries[i].flags.in_tx? 'X' : '-',
                        br->entries[i].flags.abort? 'A' : '-',
@@ -685,7 +685,7 @@ static void fprint_sample_brstacksym(struct perf_sample 
*sample,
 static void fprint_sample_brstackoff(struct perf_sample *sample,
                                    struct thread *thread,
                                    struct perf_event_attr *attr,
-                                   FILE *fp __maybe_unused)
+                                   FILE *fp)
 {
        struct branch_stack *br = sample->branch_stack;
        struct addr_location alf, alt;
@@ -709,19 +709,19 @@ static void fprint_sample_brstackoff(struct perf_sample 
*sample,
                if (alt.map && !alt.map->dso->adjust_symbols)
                        to = map__map_ip(alt.map, to);
 
-               fprintf(stdout, " 0x%"PRIx64, from);
+               fprintf(fp, "0x%"PRIx64, from);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alf.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alf.map, fp);
+                       fprintf(fp, ")");
                }
-               fprintf(stdout, "/0x%"PRIx64, to);
+               fprintf(fp, "/0x%"PRIx64, to);
                if (PRINT_FIELD(DSO)) {
-                       fprintf(stdout, "(");
-                       map__fprintf_dsoname(alt.map, stdout);
-                       fprintf(stdout, ")");
+                       fprintf(fp, "(");
+                       map__fprintf_dsoname(alt.map, fp);
+                       fprintf(fp, ")");
                }
-               fprintf(stdout, "/%c/%c/%c/%d ",
+               fprintf(fp, "/%c/%c/%c/%d ",
                        mispred_str(br->entries + i),
                        br->entries[i].flags.in_tx ? 'X' : '-',
                        br->entries[i].flags.abort ? 'A' : '-',
@@ -794,9 +794,9 @@ static int grab_bb(u8 *buffer, u64 start, u64 end,
 
 static void fprint_jump(uint64_t ip, struct branch_entry *en,
                       struct perf_insn *x, u8 *inbuf, int len,
-                      int insn, FILE *fp __maybe_unused)
+                      int insn, FILE *fp)
 {
-       fprintf(stdout, "\t%016" PRIx64 "\t%-30s\t#%s%s%s%s",
+       fprintf(fp, "\t%016" PRIx64 "\t%-30s\t#%s%s%s%s",
               ip,
               dump_insn(x, ip, inbuf, len, NULL),
               en->flags.predicted ? " PRED" : "",
@@ -804,17 +804,17 @@ static void fprint_jump(uint64_t ip, struct branch_entry 
*en,
               en->flags.in_tx ? " INTX" : "",
               en->flags.abort ? " ABORT" : "");
        if (en->flags.cycles) {
-               fprintf(stdout, " %d cycles", en->flags.cycles);
+               fprintf(fp, " %d cycles", en->flags.cycles);
                if (insn)
-                       fprintf(stdout, " %.2f IPC", (float)insn / 
en->flags.cycles);
+                       fprintf(fp, " %.2f IPC", (float)insn / 
en->flags.cycles);
        }
-       fputc('\n', stdout);
+       fputc('\n', fp);
 }
 
 static void fprint_ip_sym(struct thread *thread, u8 cpumode, int cpu,
                         uint64_t addr, struct symbol **lastsym,
                         struct perf_event_attr *attr,
-                        FILE *fp __maybe_unused)
+                        FILE *fp)
 {
        struct addr_location al;
        int off;
@@ -840,13 +840,13 @@ static void fprint_ip_sym(struct thread *thread, u8 
cpumode, int cpu,
                off = al.addr - al.sym->start;
        else
                off = al.addr - al.map->start - al.sym->start;
-       fprintf(stdout, "\t%s", al.sym->name);
+       fprintf(fp, "\t%s", al.sym->name);
        if (off)
-               fprintf(stdout, "%+d", off);
-       fputc(':', stdout);
+               fprintf(fp, "%+d", off);
+       fputc(':', fp);
        if (PRINT_FIELD(SRCLINE))
-               map__fprintf_srcline(al.map, al.addr, "\t", stdout);
-       fputc('\n', stdout);
+               map__fprintf_srcline(al.map, al.addr, "\t", fp);
+       fputc('\n', fp);
        *lastsym = al.sym;
 }
 
@@ -854,7 +854,7 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
                                     struct thread *thread,
                                     struct perf_event_attr *attr,
                                     struct machine *machine,
-                                    FILE *fp __maybe_unused)
+                                    FILE *fp)
 {
        struct branch_stack *br = sample->branch_stack;
        u64 start, end;
@@ -873,7 +873,7 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
        x.thread = thread;
        x.cpu = sample->cpu;
 
-       fputc('\n', stdout);
+       fputc('\n', fp);
 
        /* Handle first from jump, of which we don't know the entry. */
        len = grab_bb(buffer, br->entries[nr-1].from,
@@ -881,15 +881,15 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
                        machine, thread, &x.is64bit, &x.cpumode, false);
        if (len > 0) {
                fprint_ip_sym(thread, x.cpumode, x.cpu,
-                            br->entries[nr - 1].from, &lastsym, attr, stdout);
+                            br->entries[nr - 1].from, &lastsym, attr, fp);
                fprint_jump(br->entries[nr - 1].from, &br->entries[nr - 1],
-                           &x, buffer, len, 0, stdout);
+                           &x, buffer, len, 0, fp);
        }
 
        /* Print all blocks */
        for (i = nr - 2; i >= 0; i--) {
                if (br->entries[i].from || br->entries[i].to)
-                       fprintf(stdout, "%d: %" PRIx64 "-%" PRIx64 "\n", i,
+                       fprintf(fp, "%d: %" PRIx64 "-%" PRIx64 "\n", i,
                                 br->entries[i].from,
                                 br->entries[i].to);
                start = br->entries[i + 1].to;
@@ -899,7 +899,7 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
                /* Patch up missing kernel transfers due to ring filters */
                if (len == -ENXIO && i > 0) {
                        end = br->entries[--i].from;
-                       fprintf(stdout, "\tpatching up to %" PRIx64 "-%" PRIx64 
"\n", start, end);
+                       fprintf(fp, "\tpatching up to %" PRIx64 "-%" PRIx64 
"\n", start, end);
                        len = grab_bb(buffer, start, end, machine, thread, 
&x.is64bit, &x.cpumode, false);
                }
                if (len <= 0)
@@ -909,12 +909,12 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
                for (off = 0;; off += ilen) {
                        uint64_t ip = start + off;
 
-                       fprint_ip_sym(thread, x.cpumode, x.cpu, ip, &lastsym, 
attr, stdout);
+                       fprint_ip_sym(thread, x.cpumode, x.cpu, ip, &lastsym, 
attr, fp);
                        if (ip == end) {
-                               fprint_jump(ip, &br->entries[i], &x, buffer + 
off, len - off, insn, stdout);
+                               fprint_jump(ip, &br->entries[i], &x, buffer + 
off, len - off, insn, fp);
                                break;
                        } else {
-                               fprintf(stdout, "\t%016" PRIx64 "\t%s\n", ip,
+                               fprintf(fp, "\t%016" PRIx64 "\t%s\n", ip,
                                        dump_insn(&x, ip, buffer + off, len - 
off, &ilen));
                                if (ilen == 0)
                                        break;
@@ -938,7 +938,7 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
        start = br->entries[0].to;
        end = sample->ip;
        len = grab_bb(buffer, start, end, machine, thread, &x.is64bit, 
&x.cpumode, true);
-       fprint_ip_sym(thread, x.cpumode, x.cpu, start, &lastsym, attr, stdout);
+       fprint_ip_sym(thread, x.cpumode, x.cpu, start, &lastsym, attr, fp);
        if (len <= 0) {
                /* Print at least last IP if basic block did not work */
                len = grab_bb(buffer, sample->ip, sample->ip,
@@ -946,12 +946,12 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
                if (len <= 0)
                        return;
 
-               fprintf(stdout, "\t%016" PRIx64 "\t%s\n", sample->ip,
+               fprintf(fp, "\t%016" PRIx64 "\t%s\n", sample->ip,
                        dump_insn(&x, sample->ip, buffer, len, NULL));
                return;
        }
        for (off = 0; off <= end - start; off += ilen) {
-               fprintf(stdout, "\t%016" PRIx64 "\t%s\n", start + off,
+               fprintf(fp, "\t%016" PRIx64 "\t%s\n", start + off,
                        dump_insn(&x, start + off, buffer + off, len - off, 
&ilen));
                if (ilen == 0)
                        break;
@@ -961,11 +961,11 @@ static void fprint_sample_brstackinsn(struct perf_sample 
*sample,
 static void fprint_sample_addr(struct perf_sample *sample,
                          struct thread *thread,
                          struct perf_event_attr *attr,
-                         FILE *fp __maybe_unused)
+                         FILE *fp)
 {
        struct addr_location al;
 
-       fprintf(stdout, "%16" PRIx64, sample->addr);
+       fprintf(fp, "%16" PRIx64, sample->addr);
 
        if (!sample_addr_correlates_sym(attr))
                return;
@@ -973,17 +973,17 @@ static void fprint_sample_addr(struct perf_sample *sample,
        thread__resolve(thread, &al, sample);
 
        if (PRINT_FIELD(SYM)) {
-               fprintf(stdout, " ");
+               fprintf(fp, " ");
                if (PRINT_FIELD(SYMOFFSET))
-                       symbol__fprintf_symname_offs(al.sym, &al, stdout);
+                       symbol__fprintf_symname_offs(al.sym, &al, fp);
                else
-                       symbol__fprintf_symname(al.sym, stdout);
+                       symbol__fprintf_symname(al.sym, fp);
        }
 
        if (PRINT_FIELD(DSO)) {
-               fprintf(stdout, " (");
-               map__fprintf_dsoname(al.map, stdout);
-               fprintf(stdout, ")");
+               fprintf(fp, " (");
+               map__fprintf_dsoname(al.map, fp);
+               fprintf(fp, ")");
        }
 }
 
@@ -991,7 +991,7 @@ static void fprint_sample_callindent(struct perf_sample 
*sample,
                                    struct perf_evsel *evsel,
                                    struct thread *thread,
                                    struct addr_location *al,
-                                   FILE *fp __maybe_unused)
+                                   FILE *fp)
 {
        struct perf_event_attr *attr = &evsel->attr;
        size_t depth = thread_stack__depth(thread);
@@ -1026,9 +1026,9 @@ static void fprint_sample_callindent(struct perf_sample 
*sample,
        }
 
        if (name)
-               len = fprintf(stdout, "%*s%s", (int)depth * 4, "", name);
+               len = fprintf(fp, "%*s%s", (int)depth * 4, "", name);
        else if (ip)
-               len = fprintf(stdout, "%*s%16" PRIx64, (int)depth * 4, "", ip);
+               len = fprintf(fp, "%*s%16" PRIx64, (int)depth * 4, "", ip);
 
        if (len < 0)
                return;
@@ -1041,26 +1041,26 @@ static void fprint_sample_callindent(struct perf_sample 
*sample,
                spacing = round_up(len + 4, 32);
 
        if (len < spacing)
-               fprintf(stdout, "%*s", spacing - len, "");
+               fprintf(fp, "%*s", spacing - len, "");
 }
 
 static void fprint_insn(struct perf_sample *sample,
                       struct perf_event_attr *attr,
                       struct thread *thread,
                       struct machine *machine,
-                      FILE *fp __maybe_unused)
+                      FILE *fp)
 {
        if (PRINT_FIELD(INSNLEN))
-               fprintf(stdout, " ilen: %d", sample->insn_len);
+               fprintf(fp, " ilen: %d", sample->insn_len);
        if (PRINT_FIELD(INSN)) {
                int i;
 
-               fprintf(stdout, " insn:");
+               fprintf(fp, " insn:");
                for (i = 0; i < sample->insn_len; i++)
-                       fprintf(stdout, " %02x", (unsigned 
char)sample->insn[i]);
+                       fprintf(fp, " %02x", (unsigned char)sample->insn[i]);
        }
        if (PRINT_FIELD(BRSTACKINSN))
-               fprint_sample_brstackinsn(sample, thread, attr, machine, 
stdout);
+               fprint_sample_brstackinsn(sample, thread, attr, machine, fp);
 }
 
 static void fprint_sample_bts(struct perf_sample *sample,
@@ -1068,14 +1068,14 @@ static void fprint_sample_bts(struct perf_sample 
*sample,
                             struct thread *thread,
                             struct addr_location *al,
                             struct machine *machine,
-                            FILE *fp __maybe_unused)
+                            FILE *fp)
 {
        struct perf_event_attr *attr = &evsel->attr;
        unsigned int type = output_type(attr->type);
        bool print_srcline_last = false;
 
        if (PRINT_FIELD(CALLINDENT))
-               fprint_sample_callindent(sample, evsel, thread, al, stdout);
+               fprint_sample_callindent(sample, evsel, thread, al, fp);
 
        /* print branch_from information */
        if (PRINT_FIELD(IP)) {
@@ -1088,31 +1088,31 @@ static void fprint_sample_bts(struct perf_sample 
*sample,
                        cursor = &callchain_cursor;
 
                if (cursor == NULL) {
-                       fputc(' ', stdout);
+                       fputc(' ', fp);
                        if (print_opts & EVSEL__PRINT_SRCLINE) {
                                print_srcline_last = true;
                                print_opts &= ~EVSEL__PRINT_SRCLINE;
                        }
                } else
-                       fputc('\n', stdout);
+                       fputc('\n', fp);
 
-               sample__fprintf_sym(sample, al, 0, print_opts, cursor, stdout);
+               sample__fprintf_sym(sample, al, 0, print_opts, cursor, fp);
        }
 
        /* print branch_to information */
        if (PRINT_FIELD(ADDR) ||
            ((evsel->attr.sample_type & PERF_SAMPLE_ADDR) &&
             !output[type].user_set)) {
-               fprintf(stdout, " => ");
-               fprint_sample_addr(sample, thread, attr, stdout);
+               fprintf(fp, " => ");
+               fprint_sample_addr(sample, thread, attr, fp);
        }
 
        if (print_srcline_last)
-               map__fprintf_srcline(al->map, al->addr, "\n  ", stdout);
+               map__fprintf_srcline(al->map, al->addr, "\n  ", fp);
 
-       fprint_insn(sample, attr, thread, machine, stdout);
+       fprint_insn(sample, attr, thread, machine, fp);
 
-       fprintf(stdout, "\n");
+       fprintf(fp, "\n");
 }
 
 static struct {
@@ -1135,7 +1135,7 @@ static void fprint_sample_bts(struct perf_sample *sample,
        {0, NULL}
 };
 
-static void fprint_sample_flags(u32 flags, FILE *fp __maybe_unused)
+static void fprint_sample_flags(u32 flags, FILE *fp)
 {
        const char *chars = PERF_IP_FLAG_CHARS;
        const int n = strlen(PERF_IP_FLAG_CHARS);
@@ -1162,9 +1162,9 @@ static void fprint_sample_flags(u32 flags, FILE *fp 
__maybe_unused)
        str[pos] = 0;
 
        if (name)
-               fprintf(stdout, "  %-7s%4s ", name, in_tx ? "(x)" : "");
+               fprintf(fp, "  %-7s%4s ", name, in_tx ? "(x)" : "");
        else
-               fprintf(stdout, "  %-11s ", str);
+               fprintf(fp, "  %-11s ", str);
 }
 
 struct printer_data {
@@ -1181,33 +1181,34 @@ struct printer_data {
 {
        unsigned char ch = (unsigned char)val;
        struct printer_data *printer_data = extra;
+       FILE *fp = printer_data->fp;
 
        switch (op) {
        case BINARY_PRINT_DATA_BEGIN:
-               fprintf(stdout, "\n");
+               fprintf(fp, "\n");
                break;
        case BINARY_PRINT_LINE_BEGIN:
-               fprintf(stdout, "%17s", !printer_data->line_no ? "BPF output:" :
+               fprintf(fp, "%17s", !printer_data->line_no ? "BPF output:" :
                                                        "           ");
                break;
        case BINARY_PRINT_ADDR:
-               fprintf(stdout, " %04x:", val);
+               fprintf(fp, " %04x:", val);
                break;
        case BINARY_PRINT_NUM_DATA:
-               fprintf(stdout, " %02x", val);
+               fprintf(fp, " %02x", val);
                break;
        case BINARY_PRINT_NUM_PAD:
-               fprintf(stdout, "   ");
+               fprintf(fp, "   ");
                break;
        case BINARY_PRINT_SEP:
-               fprintf(stdout, "  ");
+               fprintf(fp, "  ");
                break;
        case BINARY_PRINT_CHAR_DATA:
                if (printer_data->hit_nul && ch)
                        printer_data->is_printable = false;
 
                if (!isprint(ch)) {
-                       fprintf(stdout, "%c", '.');
+                       fprintf(fp, "%c", '.');
 
                        if (!printer_data->is_printable)
                                break;
@@ -1217,14 +1218,14 @@ struct printer_data {
                        else
                                printer_data->is_printable = false;
                } else {
-                       fprintf(stdout, "%c", ch);
+                       fprintf(fp, "%c", ch);
                }
                break;
        case BINARY_PRINT_CHAR_PAD:
-               fprintf(stdout, " ");
+               fprintf(fp, " ");
                break;
        case BINARY_PRINT_LINE_END:
-               fprintf(stdout, "\n");
+               fprintf(fp, "\n");
                printer_data->line_no++;
                break;
        case BINARY_PRINT_DATA_END:
@@ -1233,31 +1234,31 @@ struct printer_data {
        }
 }
 
-static void fprint_sample_bpf_output(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_bpf_output(struct perf_sample *sample, FILE *fp)
 {
        unsigned int nr_bytes = sample->raw_size;
-       struct printer_data printer_data = {0, false, true, stdout};
+       struct printer_data printer_data = {0, false, true, fp};
 
        print_binary(sample->raw_data, nr_bytes, 8,
                     fprint_sample_bpf_output_printer, &printer_data);
 
        if (printer_data.is_printable && printer_data.hit_nul)
-               fprintf(stdout, "%17s \"%s\"\n", "BPF string:",
+               fprintf(fp, "%17s \"%s\"\n", "BPF string:",
                       (char *)(sample->raw_data));
 }
 
-static void fprint_sample_spacing(int len, int spacing, FILE *fp 
__maybe_unused)
+static void fprint_sample_spacing(int len, int spacing, FILE *fp)
 {
        if (len > 0 && len < spacing)
-               fprintf(stdout, "%*s", spacing - len, "");
+               fprintf(fp, "%*s", spacing - len, "");
 }
 
-static void fprint_sample_pt_spacing(int len, FILE *fp __maybe_unused)
+static void fprint_sample_pt_spacing(int len, FILE *fp)
 {
-       fprint_sample_spacing(len, 34, stdout);
+       fprint_sample_spacing(len, 34, fp);
 }
 
-static void fprint_sample_synth_ptwrite(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_ptwrite(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_ptwrite *data = perf_sample__synth_ptr(sample);
        int len;
@@ -1265,12 +1266,12 @@ static void fprint_sample_synth_ptwrite(struct 
perf_sample *sample, FILE *fp __m
        if (perf_sample__bad_synth_size(sample, *data))
                return;
 
-       len = fprintf(stdout, " IP: %u payload: %#" PRIx64 " ",
+       len = fprintf(fp, " IP: %u payload: %#" PRIx64 " ",
                     data->ip, le64_to_cpu(data->payload));
-       fprint_sample_pt_spacing(len, stdout);
+       fprint_sample_pt_spacing(len, fp);
 }
 
-static void fprint_sample_synth_mwait(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_mwait(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_mwait *data = perf_sample__synth_ptr(sample);
        int len;
@@ -1278,12 +1279,12 @@ static void fprint_sample_synth_mwait(struct 
perf_sample *sample, FILE *fp __may
        if (perf_sample__bad_synth_size(sample, *data))
                return;
 
-       len = fprintf(stdout, " hints: %#x extensions: %#x ",
+       len = fprintf(fp, " hints: %#x extensions: %#x ",
                     data->hints, data->extensions);
-       fprint_sample_pt_spacing(len, stdout);
+       fprint_sample_pt_spacing(len, fp);
 }
 
-static void fprint_sample_synth_pwre(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_pwre(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_pwre *data = perf_sample__synth_ptr(sample);
        int len;
@@ -1291,12 +1292,12 @@ static void fprint_sample_synth_pwre(struct perf_sample 
*sample, FILE *fp __mayb
        if (perf_sample__bad_synth_size(sample, *data))
                return;
 
-       len = fprintf(stdout, " hw: %u cstate: %u sub-cstate: %u ",
+       len = fprintf(fp, " hw: %u cstate: %u sub-cstate: %u ",
                     data->hw, data->cstate, data->subcstate);
-       fprint_sample_pt_spacing(len, stdout);
+       fprint_sample_pt_spacing(len, fp);
 }
 
-static void fprint_sample_synth_exstop(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_exstop(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_exstop *data = perf_sample__synth_ptr(sample);
        int len;
@@ -1304,11 +1305,11 @@ static void fprint_sample_synth_exstop(struct 
perf_sample *sample, FILE *fp __ma
        if (perf_sample__bad_synth_size(sample, *data))
                return;
 
-       len = fprintf(stdout, " IP: %u ", data->ip);
-       fprint_sample_pt_spacing(len, stdout);
+       len = fprintf(fp, " IP: %u ", data->ip);
+       fprint_sample_pt_spacing(len, fp);
 }
 
-static void fprint_sample_synth_pwrx(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_pwrx(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_pwrx *data = perf_sample__synth_ptr(sample);
        int len;
@@ -1316,13 +1317,13 @@ static void fprint_sample_synth_pwrx(struct perf_sample 
*sample, FILE *fp __mayb
        if (perf_sample__bad_synth_size(sample, *data))
                return;
 
-       len = fprintf(stdout, " deepest cstate: %u last cstate: %u wake reason: 
%#x ",
+       len = fprintf(fp, " deepest cstate: %u last cstate: %u wake reason: %#x 
",
                     data->deepest_cstate, data->last_cstate,
                     data->wake_reason);
-       fprint_sample_pt_spacing(len, stdout);
+       fprint_sample_pt_spacing(len, fp);
 }
 
-static void fprint_sample_synth_cbr(struct perf_sample *sample, FILE *fp 
__maybe_unused)
+static void fprint_sample_synth_cbr(struct perf_sample *sample, FILE *fp)
 {
        struct perf_synth_intel_cbr *data = perf_sample__synth_ptr(sample);
        unsigned int percent, freq;
@@ -1332,35 +1333,35 @@ static void fprint_sample_synth_cbr(struct perf_sample 
*sample, FILE *fp __maybe
                return;
 
        freq = (le32_to_cpu(data->freq) + 500) / 1000;
-       len = fprintf(stdout, " cbr: %2u freq: %4u MHz ", data->cbr, freq);
+       len = fprintf(fp, " cbr: %2u freq: %4u MHz ", data->cbr, freq);
        if (data->max_nonturbo) {
                percent = (5 + (1000 * data->cbr) / data->max_nonturbo) / 10;
-               len += fprintf(stdout, "(%3u%%) ", percent);
+               len += fprintf(fp, "(%3u%%) ", percent);
        }
-       fprint_sample_pt_spacing(len, stdout);
+       fprint_sample_pt_spacing(len, fp);
 }
 
 static void fprint_sample_synth(struct perf_sample *sample,
-                              struct perf_evsel *evsel, FILE *fp 
__maybe_unused)
+                              struct perf_evsel *evsel, FILE *fp)
 {
        switch (evsel->attr.config) {
        case PERF_SYNTH_INTEL_PTWRITE:
-               fprint_sample_synth_ptwrite(sample, stdout);
+               fprint_sample_synth_ptwrite(sample, fp);
                break;
        case PERF_SYNTH_INTEL_MWAIT:
-               fprint_sample_synth_mwait(sample, stdout);
+               fprint_sample_synth_mwait(sample, fp);
                break;
        case PERF_SYNTH_INTEL_PWRE:
-               fprint_sample_synth_pwre(sample, stdout);
+               fprint_sample_synth_pwre(sample, fp);
                break;
        case PERF_SYNTH_INTEL_EXSTOP:
-               fprint_sample_synth_exstop(sample, stdout);
+               fprint_sample_synth_exstop(sample, fp);
                break;
        case PERF_SYNTH_INTEL_PWRX:
-               fprint_sample_synth_pwrx(sample, stdout);
+               fprint_sample_synth_pwrx(sample, fp);
                break;
        case PERF_SYNTH_INTEL_CBR:
-               fprint_sample_synth_cbr(sample, stdout);
+               fprint_sample_synth_cbr(sample, fp);
                break;
        default:
                break;
@@ -1396,7 +1397,7 @@ static int perf_evlist__max_name_len(struct perf_evlist 
*evlist)
        return max;
 }
 
-static size_t data_src__fprintf(u64 data_src, FILE *fp __maybe_unused)
+static size_t data_src__fprintf(u64 data_src, FILE *fp)
 {
        struct mem_info mi = { .data_src.val = data_src };
        char decode[100];
@@ -1410,59 +1411,113 @@ static size_t data_src__fprintf(u64 data_src, FILE *fp 
__maybe_unused)
        if (maxlen < len)
                maxlen = len;
 
-       return fprintf(stdout, "%-*s", maxlen, out);
+       return fprintf(fp, "%-*s", maxlen, out);
+}
+
+static FILE *fp_selection_helper(struct perf_script *script, struct perf_evsel 
*evsel)
+{
+       const char *evname;
+       const char *file_name;
+       char *filename;
+       FILE *fp;
+       struct perf_tool *tool;
+       struct perf_script_evsel *ps;
+
+       tool = &script->tool;
+       evname = perf_evsel__name(evsel);
+       file_name = script->session->file->path;
+       if (tool->per_event_dump) {
+               ps = (struct perf_script_evsel *)evsel->priv;
+
+               /* if evname and last evsel name is not the same, opens another 
dump file. */
+               if (evname != tool->last_evsel_name) {
+                       if (asprintf(&filename, "%s%s%s%s", file_name, 
"-script-dump-",
+                                       evname, ".txt") < 0)
+                               BUG_ON("fail to add the suffix for dump file's 
name!\n");
+
+                       fp = fopen(filename, "a+");
+                       if (!fp)
+                               BUG_ON("fail to open the dump file!\n");
+
+                       if (!ps) {
+                               ps = zalloc(sizeof(struct perf_script_evsel));
+                               if (!ps)
+                                       BUG_ON("fail to create a 
perf_script_evsel struct!\n");
+                               ps->samples = 0;
+                       }
+                       ps->filename = filename;
+                       ps->dump_evsel_fp = fp;
+                       tool->last_evsel_name = evname;
+                       evsel->priv = ps;
+               } else {
+                       if (ps->dump_evsel_fp)
+                               fp = ps->dump_evsel_fp;
+                       else
+                               BUG_ON("fail to get the dump file's fp!\n");
+               }
+       } else {
+               fp = stdout;
+       }
+       return fp;
 }
 
 static void process_event(struct perf_script *script,
                          struct perf_sample *sample, struct perf_evsel *evsel,
                          struct addr_location *al,
-                         struct machine *machine, FILE *fp __maybe_unused)
+                         struct machine *machine, FILE *fp)
 {
        struct thread *thread = al->thread;
        struct perf_event_attr *attr = &evsel->attr;
        unsigned int type = output_type(attr->type);
+       struct perf_tool *tool = &script->tool;
+       struct perf_script_evsel *ps;
 
        if (output[type].fields == 0)
                return;
 
-       fprint_sample_start(sample, thread, evsel, stdout);
+       if (tool->per_event_dump) {
+               ps = (struct perf_script_evsel *)evsel->priv;
+               ps->samples++;
+               evsel->priv = ps;
+       }
+
+       fprint_sample_start(sample, thread, evsel, fp);
 
        if (PRINT_FIELD(PERIOD))
-               fprintf(stdout, "%10" PRIu64 " ", sample->period);
+               fprintf(fp, "%10" PRIu64 " ", sample->period);
 
        if (PRINT_FIELD(EVNAME)) {
                const char *evname = perf_evsel__name(evsel);
-
                if (!script->name_width)
                        script->name_width = 
perf_evlist__max_name_len(script->session->evlist);
 
-               fprintf(stdout, "%*s: ", script->name_width,
+               fprintf(fp, "%*s: ", script->name_width,
                       evname ? evname : "[unknown]");
        }
 
        if (print_flags)
-               fprint_sample_flags(sample->flags, stdout);
+               fprint_sample_flags(sample->flags, fp);
 
        if (is_bts_event(attr)) {
-               fprint_sample_bts(sample, evsel, thread, al, machine, stdout);
+               fprint_sample_bts(sample, evsel, thread, al, machine, fp);
                return;
        }
 
        if (PRINT_FIELD(TRACE))
                event_format__fprintf(evsel->tp_format, sample->cpu,
-                                   sample->raw_data, sample->raw_size, stdout);
+                                   sample->raw_data, sample->raw_size, fp);
 
        if (attr->type == PERF_TYPE_SYNTH && PRINT_FIELD(SYNTH))
-               fprint_sample_synth(sample, evsel, stdout);
+               fprint_sample_synth(sample, evsel, fp);
 
        if (PRINT_FIELD(ADDR))
-               fprint_sample_addr(sample, thread, attr, stdout);
+               fprint_sample_addr(sample, thread, attr, fp);
 
        if (PRINT_FIELD(DATA_SRC))
-               data_src__fprintf(sample->data_src, stdout);
+               data_src__fprintf(sample->data_src, fp);
 
        if (PRINT_FIELD(WEIGHT))
-               fprintf(stdout, "%16" PRIu64, sample->weight);
+               fprintf(fp, "%16" PRIu64, sample->weight);
 
        if (PRINT_FIELD(IP)) {
                struct callchain_cursor *cursor = NULL;
@@ -1472,30 +1527,30 @@ static void process_event(struct perf_script *script,
                                              sample, NULL, NULL, 
scripting_max_stack) == 0)
                        cursor = &callchain_cursor;
 
-               fputc(cursor ? '\n' : ' ', stdout);
-               sample__fprintf_sym(sample, al, 0, output[type].print_ip_opts, 
cursor, stdout);
+               fputc(cursor ? '\n' : ' ', fp);
+               sample__fprintf_sym(sample, al, 0, output[type].print_ip_opts, 
cursor, fp);
        }
 
        if (PRINT_FIELD(IREGS))
-               fprint_sample_iregs(sample, attr, stdout);
+               fprint_sample_iregs(sample, attr, fp);
 
        if (PRINT_FIELD(UREGS))
-               fprint_sample_uregs(sample, attr, stdout);
+               fprint_sample_uregs(sample, attr, fp);
 
        if (PRINT_FIELD(BRSTACK))
-               fprint_sample_brstack(sample, thread, attr, stdout);
+               fprint_sample_brstack(sample, thread, attr, fp);
        else if (PRINT_FIELD(BRSTACKSYM))
-               fprint_sample_brstacksym(sample, thread, attr, stdout);
+               fprint_sample_brstacksym(sample, thread, attr, fp);
        else if (PRINT_FIELD(BRSTACKOFF))
-               fprint_sample_brstackoff(sample, thread, attr, stdout);
+               fprint_sample_brstackoff(sample, thread, attr, fp);
 
        if (perf_evsel__is_bpf_output(evsel) && PRINT_FIELD(BPF_OUTPUT))
-               fprint_sample_bpf_output(sample, stdout);
-       fprint_insn(sample, attr, thread, machine, stdout);
+               fprint_sample_bpf_output(sample, fp);
+       fprint_insn(sample, attr, thread, machine, fp);
 
        if (PRINT_FIELD(PHYS_ADDR))
-               fprintf(stdout, "%16" PRIx64, sample->phys_addr);
-       fprintf(stdout, "\n");
+               fprintf(fp, "%16" PRIx64, sample->phys_addr);
+       fprintf(fp, "\n");
 }
 
 static struct scripting_ops    *scripting_ops;
@@ -1574,6 +1629,7 @@ static int process_sample_event(struct perf_tool *tool,
 {
        struct perf_script *scr = container_of(tool, struct perf_script, tool);
        struct addr_location al;
+       FILE *fp;
 
        if (perf_time__skip_sample(&scr->ptime, sample->time))
                return 0;
@@ -1601,10 +1657,11 @@ static int process_sample_event(struct perf_tool *tool,
        if (cpu_list && !test_bit(sample->cpu, cpu_bitmap))
                goto out_put;
 
+       fp = fp_selection_helper(scr, evsel);
        if (scripting_ops)
                scripting_ops->process_event(event, sample, evsel, &al);
        else
-               process_event(scr, sample, evsel, &al, machine, stdout);
+               process_event(scr, sample, evsel, &al, machine, fp);
 
 out_put:
        addr_location__put(&al);
@@ -1653,6 +1710,7 @@ static int process_comm_event(struct perf_tool *tool,
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
        int ret = -1;
+       FILE *fp;
 
        thread = machine__findnew_thread(machine, event->comm.pid, 
event->comm.tid);
        if (thread == NULL) {
@@ -1669,8 +1727,9 @@ static int process_comm_event(struct perf_tool *tool,
                sample->tid = event->comm.tid;
                sample->pid = event->comm.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        ret = 0;
 out:
        thread__put(thread);
@@ -1687,6 +1746,7 @@ static int process_namespaces_event(struct perf_tool 
*tool,
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
        int ret = -1;
+       FILE *fp;
 
        thread = machine__findnew_thread(machine, event->namespaces.pid,
                                         event->namespaces.tid);
@@ -1704,8 +1764,9 @@ static int process_namespaces_event(struct perf_tool 
*tool,
                sample->tid = event->namespaces.tid;
                sample->pid = event->namespaces.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        ret = 0;
 out:
        thread__put(thread);
@@ -1721,6 +1782,7 @@ static int process_fork_event(struct perf_tool *tool,
        struct perf_script *script = container_of(tool, struct perf_script, 
tool);
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
+       FILE *fp;
 
        if (perf_event__process_fork(tool, event, sample, machine) < 0)
                return -1;
@@ -1737,8 +1799,9 @@ static int process_fork_event(struct perf_tool *tool,
                sample->tid = event->fork.tid;
                sample->pid = event->fork.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        thread__put(thread);
 
        return 0;
@@ -1753,6 +1816,7 @@ static int process_exit_event(struct perf_tool *tool,
        struct perf_script *script = container_of(tool, struct perf_script, 
tool);
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
+       FILE *fp;
 
        thread = machine__findnew_thread(machine, event->fork.pid, 
event->fork.tid);
        if (thread == NULL) {
@@ -1766,8 +1830,9 @@ static int process_exit_event(struct perf_tool *tool,
                sample->tid = event->fork.tid;
                sample->pid = event->fork.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
 
        if (perf_event__process_exit(tool, event, sample, machine) < 0)
                err = -1;
@@ -1785,6 +1850,7 @@ static int process_mmap_event(struct perf_tool *tool,
        struct perf_script *script = container_of(tool, struct perf_script, 
tool);
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
+       FILE *fp;
 
        if (perf_event__process_mmap(tool, event, sample, machine) < 0)
                return -1;
@@ -1801,8 +1867,9 @@ static int process_mmap_event(struct perf_tool *tool,
                sample->tid = event->mmap.tid;
                sample->pid = event->mmap.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        thread__put(thread);
        return 0;
 }
@@ -1816,6 +1883,7 @@ static int process_mmap2_event(struct perf_tool *tool,
        struct perf_script *script = container_of(tool, struct perf_script, 
tool);
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
+       FILE *fp;
 
        if (perf_event__process_mmap2(tool, event, sample, machine) < 0)
                return -1;
@@ -1832,8 +1900,9 @@ static int process_mmap2_event(struct perf_tool *tool,
                sample->tid = event->mmap2.tid;
                sample->pid = event->mmap2.pid;
        }
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        thread__put(thread);
        return 0;
 }
@@ -1847,6 +1916,7 @@ static int process_switch_event(struct perf_tool *tool,
        struct perf_script *script = container_of(tool, struct perf_script, 
tool);
        struct perf_session *session = script->session;
        struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, 
sample->id);
+       FILE *fp;
 
        if (perf_event__process_switch(tool, event, sample, machine) < 0)
                return -1;
@@ -1857,9 +1927,9 @@ static int process_switch_event(struct perf_tool *tool,
                pr_debug("problem processing SWITCH event, skipping it.\n");
                return -1;
        }
-
-       fprint_sample_start(sample, thread, evsel, stdout);
-       perf_event__fprintf(event, stdout);
+       fp = fp_selection_helper(script, evsel);
+       fprint_sample_start(sample, thread, evsel, fp);
+       perf_event__fprintf(event, fp);
        thread__put(thread);
        return 0;
 }
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index ceac084..ef75333 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -8,6 +8,8 @@
 #include <unistd.h>
 #include <sys/types.h>
 #include <sys/mman.h>
+#include <sys/stat.h>
+#include <stdio.h>
 
 #include "evlist.h"
 #include "evsel.h"
@@ -1826,6 +1828,9 @@ static int __perf_session__process_events(struct 
perf_session *session,
 {
        struct ordered_events *oe = &session->ordered_events;
        struct perf_tool *tool = session->tool;
+       struct perf_evlist *evlist = session->evlist;
+       struct perf_evsel *evsel;
+       struct perf_script_evsel *ps;
        int fd = perf_data_file__fd(session->file);
        u64 head, page_offset, file_offset, file_pos, size;
        int err, mmap_prot, mmap_flags, map_idx = 0;
@@ -1833,6 +1838,7 @@ static int __perf_session__process_events(struct 
perf_session *session,
        char *buf, *mmaps[NUM_MMAPS];
        union perf_event *event;
        struct ui_progress prog;
+       struct stat statbuf;
        s64 skip;
 
        perf_tool__fill_defaults(tool);
@@ -1918,7 +1924,6 @@ static int __perf_session__process_events(struct 
perf_session *session,
 
        if (file_pos < file_size)
                goto more;
-
 out:
        /* do the final flush for ordered samples */
        err = ordered_events__flush(oe, OE_FLUSH__FINAL);
@@ -1938,6 +1943,19 @@ static int __perf_session__process_events(struct 
perf_session *session,
        ordered_events__reinit(&session->ordered_events);
        auxtrace__free_events(session);
        session->one_mmap = false;
+       /* Closes the dump_event file and calculates its size at last. */
+       if (tool->per_event_dump) {
+               evlist__for_each_entry(evlist, evsel) {
+                       ps = (struct perf_script_evsel *)evsel->priv;
+                       if (!ps)
+                               BUG_ON("fail to get the perf_script_evsel\n");
+                       stat(ps->filename, &statbuf);
+                       fprintf(stderr, "[ perf script: Wrote %.3f MB %s (%" 
PRIu64 " samples) ]\n",
+                               statbuf.st_size / 1024.0 / 1024.0, 
ps->filename, ps->samples);
+                       fclose(ps->dump_evsel_fp);
+                       zfree(&evsel->priv);
+               }
+       }
        return err;
 }
 
-- 
1.8.3.1

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