linux-kernel - Re: [PATCH v2 1/2] perf lock: Correct field name "flags"

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Message-ID: <20201102164213.GC3405508@krava>
Date:   Mon, 2 Nov 2020 17:42:13 +0100
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>,
        Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
        Frederic Weisbecker <fweisbec@...il.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] perf lock: Correct field name "flags"

On Wed, Oct 21, 2020 at 08:39:47AM +0800, Leo Yan wrote:
> The tracepoint "lock:lock_acquire" contains field "flags" but not
> "flag".  Current code wrongly retrieves value from field "flag" and it
> always gets zero for the value, thus "perf lock" doesn't report the
> correct result.
> 
> This patch replaces the field name "flag" with "flags", so can read out
> the correct flags for locking.
> 
> Fixes: 746f16ec6ae3 ("perf lock: Use perf_evsel__intval and perf_session__set_tracepoints_handlers")

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

btw it seems the issue was there event before that commit:
  acquire_event.flag = (int)raw_field_value(event, "flag", data);

thanks,
jirka

> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/perf/builtin-lock.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index f0a1dbacb46c..5cecc1ad78e1 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -406,7 +406,7 @@ static int report_lock_acquire_event(struct evsel *evsel,
>  	struct lock_seq_stat *seq;
>  	const char *name = evsel__strval(evsel, sample, "name");
>  	u64 tmp	 = evsel__intval(evsel, sample, "lockdep_addr");
> -	int flag = evsel__intval(evsel, sample, "flag");
> +	int flag = evsel__intval(evsel, sample, "flags");
>  
>  	memcpy(&addr, &tmp, sizeof(void *));
>  
> -- 
> 2.17.1
>