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Date: Wed, 12 Oct 2022 09:26:38 -0700
From: Namhyung Kim <namhyung@...nel.org>
To: Jiri Olsa <olsajiri@...il.com>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>,
Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
linux-perf-users <linux-perf-users@...r.kernel.org>,
Kan Liang <kan.liang@...ux.intel.com>,
Leo Yan <leo.yan@...aro.org>, Andi Kleen <ak@...ux.intel.com>,
Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
James Clark <james.clark@....com>,
Xing Zhengjun <zhengjun.xing@...ux.intel.com>
Subject: Re: [PATCH 19/19] perf stat: Remove unused perf_counts.aggr field
Hi Jiri,
On Wed, Oct 12, 2022 at 1:41 AM Jiri Olsa <olsajiri@...il.com> wrote:
>
> On Sun, Oct 09, 2022 at 10:36:00PM -0700, Namhyung Kim wrote:
> > The aggr field in the struct perf_counts is to keep the aggregated value
> > in the AGGR_GLOBAL for the old code. But it's not used anymore.
> >
> > Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> > ---
> > tools/perf/util/counts.c | 1 -
> > tools/perf/util/counts.h | 1 -
> > tools/perf/util/stat.c | 35 ++---------------------------------
> > 3 files changed, 2 insertions(+), 35 deletions(-)
> >
> > diff --git a/tools/perf/util/counts.c b/tools/perf/util/counts.c
> > index 7a447d918458..11cd85b278a6 100644
> > --- a/tools/perf/util/counts.c
> > +++ b/tools/perf/util/counts.c
> > @@ -48,7 +48,6 @@ void perf_counts__reset(struct perf_counts *counts)
> > {
> > xyarray__reset(counts->loaded);
> > xyarray__reset(counts->values);
> > - memset(&counts->aggr, 0, sizeof(struct perf_counts_values));
> > }
> >
> > void evsel__reset_counts(struct evsel *evsel)
> > diff --git a/tools/perf/util/counts.h b/tools/perf/util/counts.h
> > index 5de275194f2b..42760242e0df 100644
> > --- a/tools/perf/util/counts.h
> > +++ b/tools/perf/util/counts.h
> > @@ -11,7 +11,6 @@ struct evsel;
> >
> > struct perf_counts {
> > s8 scaled;
> > - struct perf_counts_values aggr;
> > struct xyarray *values;
> > struct xyarray *loaded;
> > };
> > diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
> > index 1652586a4925..0dccfa273fa7 100644
> > --- a/tools/perf/util/stat.c
> > +++ b/tools/perf/util/stat.c
> > @@ -307,8 +307,6 @@ static void evsel__copy_prev_raw_counts(struct evsel *evsel)
> > *perf_counts(evsel->prev_raw_counts, idx, thread);
> > }
> > }
> > -
> > - evsel->counts->aggr = evsel->prev_raw_counts->aggr;
> > }
> >
> > void evlist__copy_prev_raw_counts(struct evlist *evlist)
> > @@ -319,26 +317,6 @@ void evlist__copy_prev_raw_counts(struct evlist *evlist)
> > evsel__copy_prev_raw_counts(evsel);
> > }
> >
> > -void evlist__save_aggr_prev_raw_counts(struct evlist *evlist)
> > -{
> > - struct evsel *evsel;
> > -
> > - /*
> > - * To collect the overall statistics for interval mode,
> > - * we copy the counts from evsel->prev_raw_counts to
> > - * evsel->counts. The perf_stat_process_counter creates
> > - * aggr values from per cpu values, but the per cpu values
> > - * are 0 for AGGR_GLOBAL. So we use a trick that saves the
> > - * previous aggr value to the first member of perf_counts,
> > - * then aggr calculation in process_counter_values can work
> > - * correctly.
> > - */
> > - evlist__for_each_entry(evlist, evsel) {
> > - *perf_counts(evsel->prev_raw_counts, 0, 0) =
> > - evsel->prev_raw_counts->aggr;
> > - }
> > -}
> > -
> > static size_t pkg_id_hash(const void *__key, void *ctx __maybe_unused)
> > {
> > uint64_t *key = (uint64_t *) __key;
> > @@ -422,7 +400,6 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
> > int cpu_map_idx, int thread,
> > struct perf_counts_values *count)
> > {
> > - struct perf_counts_values *aggr = &evsel->counts->aggr;
> > struct perf_stat_evsel *ps = evsel->stats;
> > static struct perf_counts_values zero;
> > bool skip = false;
> > @@ -491,12 +468,6 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
> > }
> > }
> >
> > - if (config->aggr_mode == AGGR_GLOBAL) {
> > - aggr->val += count->val;
> > - aggr->ena += count->ena;
> > - aggr->run += count->run;
> > - }
> > -
> > return 0;
> > }
> >
> > @@ -521,13 +492,10 @@ static int process_counter_maps(struct perf_stat_config *config,
> > int perf_stat_process_counter(struct perf_stat_config *config,
> > struct evsel *counter)
> > {
> > - struct perf_counts_values *aggr = &counter->counts->aggr;
> > struct perf_stat_evsel *ps = counter->stats;
> > - u64 *count = counter->counts->aggr.values;
> > + u64 *count;
> > int ret;
> >
> > - aggr->val = aggr->ena = aggr->run = 0;
> > -
> > if (counter->per_pkg)
> > evsel__zero_per_pkg(counter);
> >
> > @@ -538,6 +506,7 @@ int perf_stat_process_counter(struct perf_stat_config *config,
> > if (config->aggr_mode != AGGR_GLOBAL)
> > return 0;
> >
> > + count = ps->aggr[0].counts.values;
> > update_stats(&ps->res_stats, *count);
>
> hi,
> for some reason 'count' could be NULL, I'm getting crash in here:
Ouch, will check. Thanks for the test!
Thanks,
Namhyung
>
> $ ./perf stat record -o krava.data true
> ...
>
> $ gdb ./perf
>
> (gdb) r stat report -i krava.data
> Starting program: /home/jolsa/kernel/linux-perf/tools/perf/perf stat report -i krava.data
> [Thread debugging using libthread_db enabled]
> Using host libthread_db library "/lib64/libthread_db.so.1".
>
> Program received signal SIGSEGV, Segmentation fault.
> 0x00000000005ae90b in perf_stat_process_counter (config=0xe18d60 <stat_config>, counter=0xecfd00) at util/stat.c:510
> 510 update_stats(&ps->res_stats, *count);
> Missing separate debuginfos, use: dnf debuginfo-install bzip2-libs-1.0.8-11.fc36.x86_64 cyrus-sasl-lib-2.1.27-18.fc36.x86_64 elfutils-debuginfod-client-0.187-4.fc36.x86_64 elfutils-libelf-0.187-4.fc36.x86_64 elfutils-libs-0.187-4.fc36.x86_64 glibc-2.35-15.fc36.x86_64 glibc-2.35-17.fc36.x86_64 keyutils-libs-1.6.1-4.fc36.x86_64 krb5-libs-1.19.2-11.fc36.x86_64 libbrotli-1.0.9-7.fc36.x86_64 libcap-2.48-4.fc36.x86_64 libcom_err-1.46.5-2.fc36.x86_64 libcurl-7.82.0-8.fc36.x86_64 libevent-2.1.12-6.fc36.x86_64 libgcc-12.2.1-2.fc36.x86_64 libidn2-2.3.3-1.fc36.x86_64 libnghttp2-1.46.0-2.fc36.x86_64 libpsl-0.21.1-5.fc36.x86_64 libselinux-3.3-4.fc36.x86_64 libssh-0.9.6-4.fc36.x86_64 libunistring-1.0-1.fc36.x86_64 libunwind-1.6.2-2.fc36.x86_64 libxcrypt-4.4.28-1.fc36.x86_64 libzstd-1.5.2-2.fc36.x86_64 numactl-libs-2.0.14-5.fc36.x86_64 openldap-2.6.3-1.fc36.x86_64 openssl-libs-3.0.5-1.fc36.x86_64 perl-libs-5.34.1-486.fc36.x86_64 python3-libs-3.10.7-1.fc36.x86_64 slang-2.3.2-11.fc36.x86_64 xz-libs-5.2.5-9.fc36.x86_64 zlib-1.2.11-33.fc36.x86_64
> (gdb) bt
> #0 0x00000000005ae90b in perf_stat_process_counter (config=0xe18d60 <stat_config>, counter=0xecfd00) at util/stat.c:510
> #1 0x000000000043b716 in process_counters () at builtin-stat.c:485
> #2 0x000000000043f2bf in process_stat_round_event (session=0xec84f0, event=0x7ffff7ffaba8) at builtin-stat.c:2099
> #3 0x000000000056c7b6 in perf_session__process_user_event (session=0xec84f0, event=0x7ffff7ffaba8, file_offset=2984, file_path=0xecf220 "krava.data")
> at util/session.c:1714
> #4 0x000000000056cea5 in perf_session__process_event (session=0xec84f0, event=0x7ffff7ffaba8, file_offset=2984, file_path=0xecf220 "krava.data")
> at util/session.c:1857
> #5 0x000000000056e4fa in process_simple (session=0xec84f0, event=0x7ffff7ffaba8, file_offset=2984, file_path=0xecf220 "krava.data") at util/session.c:2432
> #6 0x000000000056e1b9 in reader__read_event (rd=0x7fffffffb6c0, session=0xec84f0, prog=0x7fffffffb690) at util/session.c:2361
> #7 0x000000000056e3ae in reader__process_events (rd=0x7fffffffb6c0, session=0xec84f0, prog=0x7fffffffb690) at util/session.c:2410
> #8 0x000000000056e652 in __perf_session__process_events (session=0xec84f0) at util/session.c:2457
> #9 0x000000000056eff8 in perf_session__process_events (session=0xec84f0) at util/session.c:2623
> #10 0x000000000043fa53 in __cmd_report (argc=0, argv=0x7fffffffdf70) at builtin-stat.c:2265
> #11 0x000000000043fd94 in cmd_stat (argc=3, argv=0x7fffffffdf70) at builtin-stat.c:2346
> #12 0x00000000004ef495 in run_builtin (p=0xe2f930 <commands+336>, argc=4, argv=0x7fffffffdf70) at perf.c:322
> #13 0x00000000004ef709 in handle_internal_command (argc=4, argv=0x7fffffffdf70) at perf.c:376
> #14 0x00000000004ef858 in run_argv (argcp=0x7fffffffdd9c, argv=0x7fffffffdd90) at perf.c:420
> #15 0x00000000004efc1f in main (argc=4, argv=0x7fffffffdf70) at perf.c:550
> (gdb) p count
> $1 = (u64 *) 0x0
>
> jirka
>
> >
> > if (verbose > 0) {
> > --
> > 2.38.0.rc1.362.ged0d419d3c-goog
> >
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