From: Leo Yan <leo.yan@linaro.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Namhyung Kim <namhyung@kernel.org>,
Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>,
Frederic Weisbecker <fweisbec@gmail.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 1/2] perf lock: Correct field name "flags"
Date: Tue, 3 Nov 2020 09:52:16 +0800 [thread overview]
Message-ID: <20201103015216.GA13232@leoy-ThinkPad-X240s> (raw)
In-Reply-To: <20201102164213.GC3405508@krava>
On Mon, Nov 02, 2020 at 05:42:13PM +0100, Jiri Olsa wrote:
> 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@redhat.com>
>
> btw it seems the issue was there event before that commit:
> acquire_event.flag = (int)raw_field_value(event, "flag", data);
Thanks for pointing out this, I will change the fix tag as:
Fixes: e4cef1f65061 ("perf lock: Fix state machine to recognize lock sequence")
Leo
> > Signed-off-by: Leo Yan <leo.yan@linaro.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
> >
>
prev parent reply other threads:[~2020-11-03 1:52 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-21 0:39 [PATCH v2 1/2] perf lock: Correct field name "flags" Leo Yan
2020-10-21 0:39 ` [PATCH v2 2/2] perf lock: Don't free "lock_seq_stat" if read_count isn't zero Leo Yan
2020-11-02 16:56 ` Jiri Olsa
2020-11-03 2:29 ` Leo Yan
2020-11-03 11:53 ` Jiri Olsa
2020-11-02 10:24 ` [PATCH v2 1/2] perf lock: Correct field name "flags" Leo Yan
2020-11-02 16:42 ` Jiri Olsa
2020-11-03 1:52 ` Leo Yan [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20201103015216.GA13232@leoy-ThinkPad-X240s \
--to=leo.yan@linaro.org \
--cc=acme@kernel.org \
--cc=alexander.shishkin@linux.intel.com \
--cc=fweisbec@gmail.com \
--cc=jolsa@redhat.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mark.rutland@arm.com \
--cc=mingo@redhat.com \
--cc=mitake@dcl.info.waseda.ac.jp \
--cc=namhyung@kernel.org \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).