linux-kernel - Re: [PATCH v2 01/14] perf mem: Search event name with more flexible path

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Date:   Thu, 3 Sep 2020 15:50:44 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Ian Rogers <irogers@...gle.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Kemeng Shi <shikemeng@...wei.com>,
        James Clark <james.clark@....com>,
        Wei Li <liwei391@...wei.com>, Al Grant <Al.Grant@....com>,
        Will Deacon <will@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Mike Leach <mike.leach@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 01/14] perf mem: Search event name with more flexible
 path

On Tue, Sep 01, 2020 at 09:38:02AM +0100, Leo Yan wrote:
> Perf tool searches memory event name under the folder
> '/sys/devices/cpu/events/', this leads to the limitation for selection
> memory profiling event which must be under this folder.  Thus it's
> impossible to use any other event as memory event which is not under
> this specific folder, e.g. Arm SPE hardware event is not located in
> '/sys/devices/cpu/events/' so it cannot be enabled for memory profiling.
> 
> This patch changes to search folder from '/sys/devices/cpu/events/' to
> '/sys/devices', so it give flexibility to find events which can be used
> for memory profiling.
> 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>

Acked-by: Jiri Olsa <jolsa@...hat.com>

thanks,
jirka

> ---
>  tools/perf/util/mem-events.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/mem-events.c b/tools/perf/util/mem-events.c
> index ea0af0bc4314..35c8d175a9d2 100644
> --- a/tools/perf/util/mem-events.c
> +++ b/tools/perf/util/mem-events.c
> @@ -18,8 +18,8 @@ unsigned int perf_mem_events__loads_ldlat = 30;
>  #define E(t, n, s) { .tag = t, .name = n, .sysfs_name = s }
>  
>  struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
> -	E("ldlat-loads",	"cpu/mem-loads,ldlat=%u/P",	"mem-loads"),
> -	E("ldlat-stores",	"cpu/mem-stores/P",		"mem-stores"),
> +	E("ldlat-loads",	"cpu/mem-loads,ldlat=%u/P",	"cpu/events/mem-loads"),
> +	E("ldlat-stores",	"cpu/mem-stores/P",		"cpu/events/mem-stores"),
>  };
>  #undef E
>  
> @@ -93,7 +93,7 @@ int perf_mem_events__init(void)
>  		struct perf_mem_event *e = &perf_mem_events[j];
>  		struct stat st;
>  
> -		scnprintf(path, PATH_MAX, "%s/devices/cpu/events/%s",
> +		scnprintf(path, PATH_MAX, "%s/devices/%s",
>  			  mnt, e->sysfs_name);
>  
>  		if (!stat(path, &st))
> -- 
> 2.20.1
>