On Fri, Mar 27, 2015 at 05:15:34PM -0300, Arnaldo Carvalho de Melo wrote: > I.e. we're back to the sys_perf_event_open() error reporting suckz rockz > thing, this time with PeterZ trying to find a way to avoid getting back > to that discussion... /me runz... ;-P
:-) Not entirely, its just that I've not seen this userspace code in years and I'm pretty clueless. How about so then? --- Subject: perf, record: Add clockid parameter From: Peter Zijlstra <[email protected]> Date: Fri, 27 Mar 2015 15:32:01 +0100 Teach perf-record about the new perf_event_attr::{use_clockid, clockid} fields. Add a simple parameter to set the clock (if any) to be used for the events to be recorded into the data file. Since we store the entire perf_event_attr in the EVENT_DESC section we also already store the used clockid in the data file. Cc: [email protected] Signed-off-by: Peter Zijlstra (Intel) <[email protected]> --- tools/perf/Documentation/perf-record.txt | 5 +++ tools/perf/builtin-record.c | 3 ++ tools/perf/perf.h | 1 tools/perf/util/evsel.c | 44 ++++++++++++++++++++++++++++--- 4 files changed, 49 insertions(+), 4 deletions(-) --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -250,6 +250,11 @@ is off by default. --running-time:: Record running and enabled time for read events (:S) +-k:: +--clockid:: +Sets the clock id to use for the various time fields in the perf_event_type +records. See clock_gettime(). + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -739,6 +739,7 @@ static struct record record = { .uses_mmap = true, .default_per_cpu = true, }, + .clockid = -1, }, .tool = { .sample = process_sample_event, @@ -842,6 +843,8 @@ struct option __record_options[] = { "Sample machine registers on interrupt"), OPT_BOOLEAN(0, "running-time", &record.opts.running_time, "Record running/enabled time of read (:S) events"), + OPT_INTEGER('k', "clockid", &record.opts.clockid, + "clockid to use for events"), OPT_END() }; --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -62,6 +62,7 @@ struct record_opts { u64 user_interval; bool sample_transaction; unsigned initial_delay; + clockid_t clockid; }; struct option; --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -32,6 +32,7 @@ static struct { bool exclude_guest; bool mmap2; bool cloexec; + bool clockid; } perf_missing_features; static int perf_evsel__no_extra_init(struct perf_evsel *evsel __maybe_unused) @@ -761,6 +762,11 @@ void perf_evsel__config(struct perf_evse attr->disabled = 0; attr->enable_on_exec = 0; } + + if (opts->clockid >= 0) { + attr->use_clockid = 1; + attr->clockid = opts->clockid; + } } static int perf_evsel__alloc_fd(struct perf_evsel *evsel, int ncpus, int nthreads) @@ -1036,7 +1042,6 @@ static size_t perf_event_attr__fprintf(s ret += PRINT_ATTR2(exclude_user, exclude_kernel); ret += PRINT_ATTR2(exclude_hv, exclude_idle); ret += PRINT_ATTR2(mmap, comm); - ret += PRINT_ATTR2(mmap2, comm_exec); ret += PRINT_ATTR2(freq, inherit_stat); ret += PRINT_ATTR2(enable_on_exec, task); ret += PRINT_ATTR2(watermark, precise_ip); @@ -1044,6 +1049,8 @@ static size_t perf_event_attr__fprintf(s ret += PRINT_ATTR2(exclude_host, exclude_guest); ret += PRINT_ATTR2N("excl.callchain_kern", exclude_callchain_kernel, "excl.callchain_user", exclude_callchain_user); + ret += PRINT_ATTR2(mmap2, comm_exec); + ret += __PRINT_ATTR("%u",,use_clockid); ret += PRINT_ATTR_U32(wakeup_events); ret += PRINT_ATTR_U32(wakeup_watermark); @@ -1055,6 +1062,7 @@ static size_t perf_event_attr__fprintf(s ret += PRINT_ATTR_X64(branch_sample_type); ret += PRINT_ATTR_X64(sample_regs_user); ret += PRINT_ATTR_U32(sample_stack_user); + ret += PRINT_ATTR_U32(clockid); ret += PRINT_ATTR_X64(sample_regs_intr); ret += fprintf(fp, "%.60s\n", graph_dotted_line); @@ -1085,6 +1093,8 @@ static int __perf_evsel__open(struct per } fallback_missing_features: + if (perf_missing_features.clockid) + evsel->attr.use_clockid = 0; if (perf_missing_features.cloexec) flags &= ~(unsigned long)PERF_FLAG_FD_CLOEXEC; if (perf_missing_features.mmap2) @@ -1122,6 +1132,16 @@ static int __perf_evsel__open(struct per goto try_fallback; } set_rlimit = NO_CHANGE; + + /* + * If we succeeded but had to kill clockid, fail and + * have perf_evsel__open_strerror() print us a nice + * error. + */ + if (perf_missing_features.clockid) { + err = -EINVAL; + goto out_close; + } } } @@ -1155,7 +1175,10 @@ static int __perf_evsel__open(struct per if (err != -EINVAL || cpu > 0 || thread > 0) goto out_close; - if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { + if (!perf_missing_features.clockid && evsel->attr.use_clockid) { + perf_missing_features.clockid = true; + goto fallback_missing_features; + } else if (!perf_missing_features.cloexec && (flags & PERF_FLAG_FD_CLOEXEC)) { perf_missing_features.cloexec = true; goto fallback_missing_features; } else if (!perf_missing_features.mmap2 && evsel->attr.mmap2) { @@ -2063,9 +2086,7 @@ int perf_evsel__fprintf(struct perf_evse if_print(exclude_hv); if_print(exclude_idle); if_print(mmap); - if_print(mmap2); if_print(comm); - if_print(comm_exec); if_print(freq); if_print(inherit_stat); if_print(enable_on_exec); @@ -2076,10 +2097,19 @@ int perf_evsel__fprintf(struct perf_evse if_print(sample_id_all); if_print(exclude_host); if_print(exclude_guest); + if_print(exclude_callchain_kernel); + if_print(exclude_callchain_user); + if_print(mmap2); + if_print(comm_exec); + if_print(use_clockid); if_print(__reserved_1); if_print(wakeup_events); if_print(bp_type); if_print(branch_sample_type); + if_print(sample_regs_user); + if_print(sample_stack_user); + if_print(clockid); + if_print(sample_regs_intr); } out: fputc('\n', fp); @@ -2158,6 +2188,12 @@ int perf_evsel__open_strerror(struct per "The PMU counters are busy/taken by another profiler.\n" "We found oprofile daemon running, please stop it and try again."); break; + + case EINVAL: + if (perf_missing_features.clockid) + return scnprintf(msg, size, "%s", "clockid not supported."); + break; + default: break; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
