Re: [PATCH v8 1/4] perf, kvm/{x86, s390}: Remove dependency on uapi/kvm_perf.h
On 09/28/2015 08:51 PM, David Ahern wrote: On 9/28/15 9:16 AM, Scott Wood wrote: On Mon, 2015-09-28 at 08:31 -0600, David Ahern wrote: On 9/28/15 7:00 AM, Alexander Yarygin wrote: diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index fc1cffb..ef25fcf 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -31,20 +31,18 @@ #include [SNIP] @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, bool kvm_entry_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_ENTRY_TRACE); + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); } bool exit_event_end(struct perf_evsel *evsel, I agree; don't rely on kvm_events_tp. Define KVM_ENTRY_TRACE and KVM_EXIT_TRACE like x86. If you mean defining them in uapi, that doesn't work for arches that have multiple subarches that may have different trace events. This patchset doesn't actually implement dynamic support for the subarches, but it avoids adding constants to uapi headers that only apply to one of the subarches. I don't agree on relying on kvm_events_tp[0] and [1]. If you need that to be a runtime definition then change KVM_ENTRY_TRACE to const char *kvm_entry_trace and s390 and other arches can have code to set kvm_{entry,exit}_trace at runtime. Yeah, will change them to kvm_{entry,exit}_trace, instead. -- Thanks, Hemant Kumar ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v8 1/4] perf, kvm/{x86, s390}: Remove dependency on uapi/kvm_perf.h
Hi, Thanks for the review. On 09/28/2015 06:30 PM, Alexander Yarygin wrote: Hemant Kumarwrites: Its better to remove the dependency on uapi/kvm_perf.h to allow dynamic discovery of kvm events (if its needed). To do this, some extern variables have been introduced with which we can keep the generic functions generic. Signed-off-by: Hemant Kumar --- Changes since v7: - Removed __maybe_unused for some parameters which weren't needed. tools/perf/arch/s390/util/kvm-stat.c | 10 - tools/perf/arch/x86/util/kvm-stat.c | 12 ++- tools/perf/builtin-kvm.c | 39 +++- tools/perf/util/kvm-stat.h | 3 +++ 4 files changed, 48 insertions(+), 16 deletions(-) Hello, The patchset doesn't break s390 code (and at least build on x86), but I Thanks for testing it on s390. don't really like some things here (e.g. direct access to kvm_events_tp), see below. Thanks. CC: David Ahern diff --git a/tools/perf/arch/s390/util/kvm-stat.c b/tools/perf/arch/s390/util/kvm-stat.c index a5dbc07..c2acb3e 100644 --- a/tools/perf/arch/s390/util/kvm-stat.c +++ b/tools/perf/arch/s390/util/kvm-stat.c @@ -10,7 +10,11 @@ */ #include "../../util/kvm-stat.h" -#include +#include + +#define DECODE_STR_LEN 40 +#define VCPU_ID "id" +#define KVM_EXIT_REASON "icptcode" I would probably drop them. There are no users besides newly introduced const char *vcpu_id_str and decore_str_len etc anyway. Right, will drop them. define_exit_reasons_table(sie_exit_reasons, sie_intercept_code); define_exit_reasons_table(sie_icpt_insn_codes, icpt_insn_codes); @@ -83,6 +87,10 @@ const char * const kvm_events_tp[] = { NULL, }; +const char *vcpu_id_str = VCPU_ID; +const int decode_str_len = DECODE_STR_LEN; +const char *exit_reason_code = KVM_EXIT_REASON; + struct kvm_reg_events_ops kvm_reg_events_ops[] = { { .name = "vmexit", .ops = _events }, { NULL, NULL }, diff --git a/tools/perf/arch/x86/util/kvm-stat.c b/tools/perf/arch/x86/util/kvm-stat.c index 14e4e66..2d0d43b5 100644 --- a/tools/perf/arch/x86/util/kvm-stat.c +++ b/tools/perf/arch/x86/util/kvm-stat.c @@ -1,5 +1,11 @@ #include "../../util/kvm-stat.h" -#include +#include +#include +#include + +#define DECODE_STR_LEN 20 +#define VCPU_ID "vcpu_id" +#define KVM_EXIT_REASON "exit_reason" define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS); define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS); @@ -129,6 +135,10 @@ const char * const kvm_events_tp[] = { NULL, }; +const char *vcpu_id_str = VCPU_ID; +const int decode_str_len = DECODE_STR_LEN; +const char *exit_reason_code = KVM_EXIT_REASON; + struct kvm_reg_events_ops kvm_reg_events_ops[] = { { .name = "vmexit", .ops = _events }, { .name = "mmio", .ops = _events }, diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index fc1cffb..ef25fcf 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -31,20 +31,18 @@ #include #ifdef HAVE_KVM_STAT_SUPPORT -#include #include "util/kvm-stat.h" -void exit_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, struct event_key *key) { key->info = 0; - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); } bool kvm_exit_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_EXIT_TRACE); + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); } Hmm, direct access to kvm_events_tp? Maybe add a getter for this or something like extern char *kvm_exit_trace;? Makes sense, will make them extern const kvm_{exit,entry}_trace and assign them in their respective archs. /* why strncmp? */ bool exit_event_begin(struct perf_evsel *evsel, @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, bool kvm_entry_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_ENTRY_TRACE); + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); } bool exit_event_end(struct perf_evsel *evsel, @@ -71,8 +69,8 @@ bool exit_event_end(struct perf_evsel *evsel, } static const char *get_exit_reason(struct perf_kvm_stat *kvm, - struct exit_reasons_table *tbl, - u64 exit_code) + struct exit_reasons_table *tbl, + u64 exit_code) { while (tbl->reason != NULL) { if (tbl->exit_code == exit_code) @@ -92,7 +90,7 @@ void exit_event_decode_key(struct perf_kvm_stat *kvm, const char *exit_reason = get_exit_reason(kvm, key->exit_reasons,
Re: [PATCH v8 1/4] perf, kvm/{x86, s390}: Remove dependency on uapi/kvm_perf.h
Hemant Kumarwrites: > Its better to remove the dependency on uapi/kvm_perf.h to allow dynamic > discovery of kvm events (if its needed). To do this, some extern > variables have been introduced with which we can keep the generic > functions generic. > > Signed-off-by: Hemant Kumar > --- > Changes since v7: > - Removed __maybe_unused for some parameters which weren't needed. > > tools/perf/arch/s390/util/kvm-stat.c | 10 - > tools/perf/arch/x86/util/kvm-stat.c | 12 ++- > tools/perf/builtin-kvm.c | 39 > +++- > tools/perf/util/kvm-stat.h | 3 +++ > 4 files changed, 48 insertions(+), 16 deletions(-) Hello, The patchset doesn't break s390 code (and at least build on x86), but I don't really like some things here (e.g. direct access to kvm_events_tp), see below. Thanks. CC: David Ahern > > diff --git a/tools/perf/arch/s390/util/kvm-stat.c > b/tools/perf/arch/s390/util/kvm-stat.c > index a5dbc07..c2acb3e 100644 > --- a/tools/perf/arch/s390/util/kvm-stat.c > +++ b/tools/perf/arch/s390/util/kvm-stat.c > @@ -10,7 +10,11 @@ > */ > > #include "../../util/kvm-stat.h" > -#include > +#include > + > +#define DECODE_STR_LEN 40 > +#define VCPU_ID "id" > +#define KVM_EXIT_REASON "icptcode" > I would probably drop them. There are no users besides newly introduced const char *vcpu_id_str and decore_str_len etc anyway. > define_exit_reasons_table(sie_exit_reasons, sie_intercept_code); > define_exit_reasons_table(sie_icpt_insn_codes, icpt_insn_codes); > @@ -83,6 +87,10 @@ const char * const kvm_events_tp[] = { > NULL, > }; > > +const char *vcpu_id_str = VCPU_ID; > +const int decode_str_len = DECODE_STR_LEN; > +const char *exit_reason_code = KVM_EXIT_REASON; > + > struct kvm_reg_events_ops kvm_reg_events_ops[] = { > { .name = "vmexit", .ops = _events }, > { NULL, NULL }, > diff --git a/tools/perf/arch/x86/util/kvm-stat.c > b/tools/perf/arch/x86/util/kvm-stat.c > index 14e4e66..2d0d43b5 100644 > --- a/tools/perf/arch/x86/util/kvm-stat.c > +++ b/tools/perf/arch/x86/util/kvm-stat.c > @@ -1,5 +1,11 @@ > #include "../../util/kvm-stat.h" > -#include > +#include > +#include > +#include > + > +#define DECODE_STR_LEN 20 > +#define VCPU_ID "vcpu_id" > +#define KVM_EXIT_REASON "exit_reason" > > define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS); > define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS); > @@ -129,6 +135,10 @@ const char * const kvm_events_tp[] = { > NULL, > }; > > +const char *vcpu_id_str = VCPU_ID; > +const int decode_str_len = DECODE_STR_LEN; > +const char *exit_reason_code = KVM_EXIT_REASON; > + > struct kvm_reg_events_ops kvm_reg_events_ops[] = { > { .name = "vmexit", .ops = _events }, > { .name = "mmio", .ops = _events }, > diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c > index fc1cffb..ef25fcf 100644 > --- a/tools/perf/builtin-kvm.c > +++ b/tools/perf/builtin-kvm.c > @@ -31,20 +31,18 @@ > #include > > #ifdef HAVE_KVM_STAT_SUPPORT > -#include > #include "util/kvm-stat.h" > > -void exit_event_get_key(struct perf_evsel *evsel, > - struct perf_sample *sample, > +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, > struct event_key *key) > { > key->info = 0; > - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); > + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); > } > > bool kvm_exit_event(struct perf_evsel *evsel) > { > - return !strcmp(evsel->name, KVM_EXIT_TRACE); > + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); > } Hmm, direct access to kvm_events_tp? Maybe add a getter for this or something like extern char *kvm_exit_trace;? /* why strncmp? */ > > bool exit_event_begin(struct perf_evsel *evsel, > @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, > > bool kvm_entry_event(struct perf_evsel *evsel) > { > - return !strcmp(evsel->name, KVM_ENTRY_TRACE); > + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); > } > > bool exit_event_end(struct perf_evsel *evsel, > @@ -71,8 +69,8 @@ bool exit_event_end(struct perf_evsel *evsel, > } > > static const char *get_exit_reason(struct perf_kvm_stat *kvm, > -struct exit_reasons_table *tbl, > -u64 exit_code) > + struct exit_reasons_table *tbl, > + u64 exit_code) > { > while (tbl->reason != NULL) { > if (tbl->exit_code == exit_code) > @@ -92,7 +90,7 @@ void exit_event_decode_key(struct perf_kvm_stat *kvm, > const char *exit_reason = get_exit_reason(kvm, key->exit_reasons, > key->key); > > - scnprintf(decode, DECODE_STR_LEN, "%s", exit_reason); > +
Re: [PATCH v8 1/4] perf,kvm/{x86,s390}: Remove dependency on uapi/kvm_perf.h
On 9/28/15 7:00 AM, Alexander Yarygin wrote: diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index fc1cffb..ef25fcf 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -31,20 +31,18 @@ #include #ifdef HAVE_KVM_STAT_SUPPORT -#include #include "util/kvm-stat.h" -void exit_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, struct event_key *key) { key->info = 0; - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); } bool kvm_exit_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_EXIT_TRACE); + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); } Hmm, direct access to kvm_events_tp? Maybe add a getter for this or something like extern char *kvm_exit_trace;? /* why strncmp? */ bool exit_event_begin(struct perf_evsel *evsel, @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, bool kvm_entry_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_ENTRY_TRACE); + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); } bool exit_event_end(struct perf_evsel *evsel, I agree; don't rely on kvm_events_tp. Define KVM_ENTRY_TRACE and KVM_EXIT_TRACE like x86. ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v8 1/4] perf,kvm/{x86,s390}: Remove dependency on uapi/kvm_perf.h
On 9/28/15 9:16 AM, Scott Wood wrote: On Mon, 2015-09-28 at 08:31 -0600, David Ahern wrote: On 9/28/15 7:00 AM, Alexander Yarygin wrote: diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index fc1cffb..ef25fcf 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -31,20 +31,18 @@ #include #ifdef HAVE_KVM_STAT_SUPPORT -#include #include "util/kvm-stat.h" -void exit_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, struct event_key *key) { key->info = 0; - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); } bool kvm_exit_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_EXIT_TRACE); + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); } Hmm, direct access to kvm_events_tp? Maybe add a getter for this or something like extern char *kvm_exit_trace;? /* why strncmp? */ bool exit_event_begin(struct perf_evsel *evsel, @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, bool kvm_entry_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_ENTRY_TRACE); + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); } bool exit_event_end(struct perf_evsel *evsel, I agree; don't rely on kvm_events_tp. Define KVM_ENTRY_TRACE and KVM_EXIT_TRACE like x86. If you mean defining them in uapi, that doesn't work for arches that have multiple subarches that may have different trace events. This patchset doesn't actually implement dynamic support for the subarches, but it avoids adding constants to uapi headers that only apply to one of the subarches. I don't agree on relying on kvm_events_tp[0] and [1]. If you need that to be a runtime definition then change KVM_ENTRY_TRACE to const char *kvm_entry_trace and s390 and other arches can have code to set kvm_{entry,exit}_trace at runtime. David ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
Re: [PATCH v8 1/4] perf,kvm/{x86,s390}: Remove dependency on uapi/kvm_perf.h
On Mon, 2015-09-28 at 08:31 -0600, David Ahern wrote: > On 9/28/15 7:00 AM, Alexander Yarygin wrote: > > > diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c > > > index fc1cffb..ef25fcf 100644 > > > --- a/tools/perf/builtin-kvm.c > > > +++ b/tools/perf/builtin-kvm.c > > > @@ -31,20 +31,18 @@ > > > #include > > > > > > #ifdef HAVE_KVM_STAT_SUPPORT > > > -#include > > > #include "util/kvm-stat.h" > > > > > > -void exit_event_get_key(struct perf_evsel *evsel, > > > - struct perf_sample *sample, > > > +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample > > > *sample, > > > struct event_key *key) > > > { > > > key->info = 0; > > > - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); > > > + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); > > > } > > > > > > bool kvm_exit_event(struct perf_evsel *evsel) > > > { > > > - return !strcmp(evsel->name, KVM_EXIT_TRACE); > > > + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); > > > } > > > > Hmm, direct access to kvm_events_tp? Maybe add a getter for this or > > something like extern char *kvm_exit_trace;? > > /* why strncmp? */ > > > > > > > > bool exit_event_begin(struct perf_evsel *evsel, > > > @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, > > > > > > bool kvm_entry_event(struct perf_evsel *evsel) > > > { > > > - return !strcmp(evsel->name, KVM_ENTRY_TRACE); > > > + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); > > > } > > > > > > bool exit_event_end(struct perf_evsel *evsel, > > I agree; don't rely on kvm_events_tp. Define KVM_ENTRY_TRACE and > KVM_EXIT_TRACE like x86. If you mean defining them in uapi, that doesn't work for arches that have multiple subarches that may have different trace events. This patchset doesn't actually implement dynamic support for the subarches, but it avoids adding constants to uapi headers that only apply to one of the subarches. -Scott ___ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
[PATCH v8 1/4] perf, kvm/{x86, s390}: Remove dependency on uapi/kvm_perf.h
Its better to remove the dependency on uapi/kvm_perf.h to allow dynamic discovery of kvm events (if its needed). To do this, some extern variables have been introduced with which we can keep the generic functions generic. Signed-off-by: Hemant Kumar--- Changes since v7: - Removed __maybe_unused for some parameters which weren't needed. tools/perf/arch/s390/util/kvm-stat.c | 10 - tools/perf/arch/x86/util/kvm-stat.c | 12 ++- tools/perf/builtin-kvm.c | 39 +++- tools/perf/util/kvm-stat.h | 3 +++ 4 files changed, 48 insertions(+), 16 deletions(-) diff --git a/tools/perf/arch/s390/util/kvm-stat.c b/tools/perf/arch/s390/util/kvm-stat.c index a5dbc07..c2acb3e 100644 --- a/tools/perf/arch/s390/util/kvm-stat.c +++ b/tools/perf/arch/s390/util/kvm-stat.c @@ -10,7 +10,11 @@ */ #include "../../util/kvm-stat.h" -#include +#include + +#define DECODE_STR_LEN 40 +#define VCPU_ID "id" +#define KVM_EXIT_REASON "icptcode" define_exit_reasons_table(sie_exit_reasons, sie_intercept_code); define_exit_reasons_table(sie_icpt_insn_codes, icpt_insn_codes); @@ -83,6 +87,10 @@ const char * const kvm_events_tp[] = { NULL, }; +const char *vcpu_id_str = VCPU_ID; +const int decode_str_len = DECODE_STR_LEN; +const char *exit_reason_code = KVM_EXIT_REASON; + struct kvm_reg_events_ops kvm_reg_events_ops[] = { { .name = "vmexit", .ops = _events }, { NULL, NULL }, diff --git a/tools/perf/arch/x86/util/kvm-stat.c b/tools/perf/arch/x86/util/kvm-stat.c index 14e4e66..2d0d43b5 100644 --- a/tools/perf/arch/x86/util/kvm-stat.c +++ b/tools/perf/arch/x86/util/kvm-stat.c @@ -1,5 +1,11 @@ #include "../../util/kvm-stat.h" -#include +#include +#include +#include + +#define DECODE_STR_LEN 20 +#define VCPU_ID "vcpu_id" +#define KVM_EXIT_REASON "exit_reason" define_exit_reasons_table(vmx_exit_reasons, VMX_EXIT_REASONS); define_exit_reasons_table(svm_exit_reasons, SVM_EXIT_REASONS); @@ -129,6 +135,10 @@ const char * const kvm_events_tp[] = { NULL, }; +const char *vcpu_id_str = VCPU_ID; +const int decode_str_len = DECODE_STR_LEN; +const char *exit_reason_code = KVM_EXIT_REASON; + struct kvm_reg_events_ops kvm_reg_events_ops[] = { { .name = "vmexit", .ops = _events }, { .name = "mmio", .ops = _events }, diff --git a/tools/perf/builtin-kvm.c b/tools/perf/builtin-kvm.c index fc1cffb..ef25fcf 100644 --- a/tools/perf/builtin-kvm.c +++ b/tools/perf/builtin-kvm.c @@ -31,20 +31,18 @@ #include #ifdef HAVE_KVM_STAT_SUPPORT -#include #include "util/kvm-stat.h" -void exit_event_get_key(struct perf_evsel *evsel, - struct perf_sample *sample, +void exit_event_get_key(struct perf_evsel *evsel, struct perf_sample *sample, struct event_key *key) { key->info = 0; - key->key = perf_evsel__intval(evsel, sample, KVM_EXIT_REASON); + key->key = perf_evsel__intval(evsel, sample, exit_reason_code); } bool kvm_exit_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_EXIT_TRACE); + return !strncmp(evsel->name, kvm_events_tp[1], strlen(evsel->name)); } bool exit_event_begin(struct perf_evsel *evsel, @@ -60,7 +58,7 @@ bool exit_event_begin(struct perf_evsel *evsel, bool kvm_entry_event(struct perf_evsel *evsel) { - return !strcmp(evsel->name, KVM_ENTRY_TRACE); + return !strncmp(evsel->name, kvm_events_tp[0], strlen(evsel->name)); } bool exit_event_end(struct perf_evsel *evsel, @@ -71,8 +69,8 @@ bool exit_event_end(struct perf_evsel *evsel, } static const char *get_exit_reason(struct perf_kvm_stat *kvm, - struct exit_reasons_table *tbl, - u64 exit_code) + struct exit_reasons_table *tbl, + u64 exit_code) { while (tbl->reason != NULL) { if (tbl->exit_code == exit_code) @@ -92,7 +90,7 @@ void exit_event_decode_key(struct perf_kvm_stat *kvm, const char *exit_reason = get_exit_reason(kvm, key->exit_reasons, key->key); - scnprintf(decode, DECODE_STR_LEN, "%s", exit_reason); + scnprintf(decode, decode_str_len, "%s", exit_reason); } static bool register_kvm_events_ops(struct perf_kvm_stat *kvm) @@ -358,7 +356,12 @@ static bool handle_end_event(struct perf_kvm_stat *kvm, time_diff = sample->time - time_begin; if (kvm->duration && time_diff > kvm->duration) { - char decode[DECODE_STR_LEN]; + char *decode = zalloc(decode_str_len); + + if (!decode) { + pr_err("Not enough memory\n"); + return false; + } kvm->events_ops->decode_key(kvm, >key, decode); if (!skip_event(decode)) { @@ -366,6 +369,7 @@ static bool