Messages in this thread | | | Date | Thu, 22 Sep 2022 16:04:01 +0800 | Subject | Re: [PATCH 2/2] perf parse-events: Remove "not supported" hybrid cache events | From | Xing Zhengjun <> |
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On 9/22/2022 11:16 AM, Ian Rogers wrote: > On Wed, Sep 21, 2022 at 6:47 PM <zhengjun.xing@linux.intel.com> wrote: >> >> From: Zhengjun Xing <zhengjun.xing@linux.intel.com> >> >> By default, we create two hybrid cache events, one is for cpu_core, and >> another is for cpu_atom. But Some hybrid hardware cache events are only >> available on one CPU PMU. For example, the 'L1-dcache-load-misses' is only >> available on cpu_core, while the 'L1-icache-loads' is only available on >> cpu_atom. We need to remove "not supported" hybrid cache events. By >> extending is_event_supported() to global API and using it to check if the >> hybrid cache events are supported before being created, we can remove the >> "not supported" hybrid cache events. >> >> Before: >> >> # ./perf stat -e L1-dcache-load-misses,L1-icache-loads -a sleep 1 >> >> Performance counter stats for 'system wide': >> >> 52,570 cpu_core/L1-dcache-load-misses/ >> <not supported> cpu_atom/L1-dcache-load-misses/ >> <not supported> cpu_core/L1-icache-loads/ >> 1,471,817 cpu_atom/L1-icache-loads/ >> >> 1.004915229 seconds time elapsed >> >> After: >> >> # ./perf stat -e L1-dcache-load-misses,L1-icache-loads -a sleep 1 >> >> Performance counter stats for 'system wide': >> >> 54,510 cpu_core/L1-dcache-load-misses/ >> 1,441,286 cpu_atom/L1-icache-loads/ >> >> 1.005114281 seconds time elapsed >> >> Fixes: 30def61f64ba ("perf parse-events: Create two hybrid cache events") >> Signed-off-by: Zhengjun Xing <zhengjun.xing@linux.intel.com> >> Reviewed-by: Kan Liang <kan.liang@linux.intel.com> >> --- >> tools/perf/util/parse-events-hybrid.c | 8 +++++++- >> tools/perf/util/print-events.c | 2 +- >> tools/perf/util/print-events.h | 3 ++- >> 3 files changed, 10 insertions(+), 3 deletions(-) >> >> diff --git a/tools/perf/util/parse-events-hybrid.c b/tools/perf/util/parse-events-hybrid.c >> index 284f8eabd3b9..cf2e1c2e968f 100644 >> --- a/tools/perf/util/parse-events-hybrid.c >> +++ b/tools/perf/util/parse-events-hybrid.c >> @@ -14,6 +14,7 @@ >> #include "pmu.h" >> #include "pmu-hybrid.h" >> #include "perf.h" >> +#include "print-events.h" >> >> static void config_hybrid_attr(struct perf_event_attr *attr, >> int type, int pmu_type) >> @@ -48,13 +49,18 @@ static int create_event_hybrid(__u32 config_type, int *idx, >> __u64 config = attr->config; >> >> config_hybrid_attr(attr, config_type, pmu->type); >> + >> + if (attr->type == PERF_TYPE_HW_CACHE >> + && !is_event_supported(attr->type, attr->config)) >> + goto out; > > A comment to explain this would be useful.
Thanks, I will add a comment in the next version. > >> + >> evsel = parse_events__add_event_hybrid(list, idx, attr, name, metric_id, >> pmu, config_terms); >> if (evsel) >> evsel->pmu_name = strdup(pmu->name); >> else >> return -ENOMEM; > > For consistency should this use the "goto" pattern now? You can also > handle the ENOMEM case for strdup. > Yes, I will add a strdup check in the next version. >> - >> +out: >> attr->type = type; >> attr->config = config; >> return 0; >> diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c >> index 04050d4f6db8..fa5cc94cfcfe 100644 >> --- a/tools/perf/util/print-events.c >> +++ b/tools/perf/util/print-events.c >> @@ -239,7 +239,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob, >> strlist__delete(sdtlist); >> } >> >> -static bool is_event_supported(u8 type, u64 config) >> +bool is_event_supported(u8 type, u64 config) > > This makes me tempted to say this function should be in parse-events.c. > "is_event_supported" move to parse-events.c should be better, I will do it in the next version.
> Thanks, > Ian > >> { >> bool ret = true; >> int open_return; >> diff --git a/tools/perf/util/print-events.h b/tools/perf/util/print-events.h >> index 1da9910d83a6..ad2902fd0507 100644 >> --- a/tools/perf/util/print-events.h >> +++ b/tools/perf/util/print-events.h >> @@ -1,14 +1,15 @@ >> /* SPDX-License-Identifier: GPL-2.0 */ >> #ifndef __PERF_PRINT_EVENTS_H >> #define __PERF_PRINT_EVENTS_H >> - >> #include <stdbool.h> >> +#include <linux/types.h> >> >> struct event_symbol; >> >> void print_events(const char *event_glob, bool name_only, bool quiet_flag, >> bool long_desc, bool details_flag, bool deprecated, >> const char *pmu_name); >> +bool is_event_supported(u8 type, u64 config); >> int print_hwcache_events(const char *event_glob, bool name_only); >> void print_sdt_events(const char *subsys_glob, const char *event_glob, >> bool name_only); >> -- >> 2.25.1 >>
-- Zhengjun Xing
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