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Message-ID: <ZroQ7wiw6JB-sjps@x1>
Date: Mon, 12 Aug 2024 10:41:03 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Dapeng Mi <dapeng1.mi@...ux.intel.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>,
Adrian Hunter <adrian.hunter@...el.com>,
Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
Kan Liang <kan.liang@...ux.intel.com>,
linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
Yongwei Ma <yongwei.ma@...el.com>, Dapeng Mi <dapeng1.mi@...el.com>
Subject: Re: [Patch v3 1/5] perf x86/topdown: Complete topdown slots/metrics
events check
On Fri, Jul 12, 2024 at 05:03:35PM +0000, Dapeng Mi wrote:
> It's not complete to check whether an event is a topdown slots or
> topdown metrics event by only comparing the event name since user
> may assign the event by RAW format, e.g.
>
> perf stat -e '{instructions,cpu/r400/,cpu/r8300/}' sleep 1
>
> Performance counter stats for 'sleep 1':
>
> <not counted> instructions
> <not counted> cpu/r400/
> <not supported> cpu/r8300/
>
> 1.002917796 seconds time elapsed
>
> 0.002955000 seconds user
> 0.000000000 seconds sys
>
> The RAW format slots and topdown-be-bound events are not recognized and
> not regroup the events, and eventually cause error.
>
> Thus add two helpers arch_is_topdown_slots()/arch_is_topdown_metrics()
> to detect whether an event is topdown slots/metrics event by comparing
> the event config directly, and use these two helpers to replace the
> original event name comparisons.
Looks ok, I made a comment below, please take a look
> Signed-off-by: Dapeng Mi <dapeng1.mi@...ux.intel.com>
> ---
> tools/perf/arch/x86/util/evlist.c | 8 ++---
> tools/perf/arch/x86/util/evsel.c | 3 +-
> tools/perf/arch/x86/util/topdown.c | 48 +++++++++++++++++++++++++++++-
> tools/perf/arch/x86/util/topdown.h | 2 ++
> 4 files changed, 55 insertions(+), 6 deletions(-)
>
> diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
> index b1ce0c52d88d..332e8907f43e 100644
> --- a/tools/perf/arch/x86/util/evlist.c
> +++ b/tools/perf/arch/x86/util/evlist.c
> @@ -78,14 +78,14 @@ int arch_evlist__cmp(const struct evsel *lhs, const struct evsel *rhs)
> if (topdown_sys_has_perf_metrics() &&
> (arch_evsel__must_be_in_group(lhs) || arch_evsel__must_be_in_group(rhs))) {
> /* Ensure the topdown slots comes first. */
> - if (strcasestr(lhs->name, "slots") && !strcasestr(lhs->name, "uops_retired.slots"))
> + if (arch_is_topdown_slots(lhs))
> return -1;
> - if (strcasestr(rhs->name, "slots") && !strcasestr(rhs->name, "uops_retired.slots"))
> + if (arch_is_topdown_slots(rhs))
> return 1;
> /* Followed by topdown events. */
> - if (strcasestr(lhs->name, "topdown") && !strcasestr(rhs->name, "topdown"))
> + if (arch_is_topdown_metrics(lhs) && !arch_is_topdown_metrics(rhs))
> return -1;
> - if (!strcasestr(lhs->name, "topdown") && strcasestr(rhs->name, "topdown"))
> + if (!arch_is_topdown_metrics(lhs) && arch_is_topdown_metrics(rhs))
> return 1;
> }
>
> diff --git a/tools/perf/arch/x86/util/evsel.c b/tools/perf/arch/x86/util/evsel.c
> index 090d0f371891..181f2ba0bb2a 100644
> --- a/tools/perf/arch/x86/util/evsel.c
> +++ b/tools/perf/arch/x86/util/evsel.c
> @@ -6,6 +6,7 @@
> #include "util/pmu.h"
> #include "util/pmus.h"
> #include "linux/string.h"
> +#include "topdown.h"
> #include "evsel.h"
> #include "util/debug.h"
> #include "env.h"
> @@ -44,7 +45,7 @@ bool arch_evsel__must_be_in_group(const struct evsel *evsel)
> strcasestr(evsel->name, "uops_retired.slots"))
> return false;
>
> - return strcasestr(evsel->name, "topdown") || strcasestr(evsel->name, "slots");
> + return arch_is_topdown_metrics(evsel) || arch_is_topdown_slots(evsel);
> }
>
> int arch_evsel__hw_name(struct evsel *evsel, char *bf, size_t size)
> diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c
> index 3f9a267d4501..49f25d67ed77 100644
> --- a/tools/perf/arch/x86/util/topdown.c
> +++ b/tools/perf/arch/x86/util/topdown.c
> @@ -32,6 +32,52 @@ bool topdown_sys_has_perf_metrics(void)
> }
>
> #define TOPDOWN_SLOTS 0x0400
> +bool arch_is_topdown_slots(const struct evsel *evsel)
> +{
> + if (evsel->core.attr.config == TOPDOWN_SLOTS)
> + return true;
> +
> + return false;
> +}
> +
> +static int compare_topdown_event(void *vstate, struct pmu_event_info *info)
> +{
> + int *config = vstate;
> + int event = 0;
> + int umask = 0;
> + char *str;
> +
> + if (!strcasestr(info->name, "topdown"))
> + return 0;
> +
> + str = strcasestr(info->str, "event=");
> + if (str)
> + sscanf(str, "event=%x", &event);
> +
> + str = strcasestr(info->str, "umask=");
> + if (str)
> + sscanf(str, "umask=%x", &umask);
> +
> + if (event == 0 && *config == (event | umask << 8))
> + return 1;
> +
> + return 0;
> +}
> +
> +bool arch_is_topdown_metrics(const struct evsel *evsel)
> +{
> + struct perf_pmu *pmu = evsel__find_pmu(evsel);
> + int config = evsel->core.attr.config;
Humm, can we cache this information? I.e. have some evsel->is_topdown:1
bit to avoid having to traverse all events if we call this multiple
times for the same evsel?
- Arnaldo
> + if (!pmu || !pmu->is_core)
> + return false;
> +
> + if (perf_pmu__for_each_event(pmu, false, &config,
> + compare_topdown_event))
> + return true;
> +
> + return false;
> +}
>
> /*
> * Check whether a topdown group supports sample-read.
> @@ -44,7 +90,7 @@ bool arch_topdown_sample_read(struct evsel *leader)
> if (!evsel__sys_has_perf_metrics(leader))
> return false;
>
> - if (leader->core.attr.config == TOPDOWN_SLOTS)
> + if (arch_is_topdown_slots(leader))
> return true;
>
> return false;
> diff --git a/tools/perf/arch/x86/util/topdown.h b/tools/perf/arch/x86/util/topdown.h
> index 46bf9273e572..1bae9b1822d7 100644
> --- a/tools/perf/arch/x86/util/topdown.h
> +++ b/tools/perf/arch/x86/util/topdown.h
> @@ -3,5 +3,7 @@
> #define _TOPDOWN_H 1
>
> bool topdown_sys_has_perf_metrics(void);
> +bool arch_is_topdown_slots(const struct evsel *evsel);
> +bool arch_is_topdown_metrics(const struct evsel *evsel);
>
> #endif
> --
> 2.40.1
>
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