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Message-ID: <20140821070451.GA1487@krava.brq.redhat.com> Date: Thu, 21 Aug 2014 09:04:51 +0200 From: Jiri Olsa <jolsa@...hat.com> To: Don Zickus <dzickus@...hat.com> Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, LKML <linux-kernel@...r.kernel.org>, eranian@...gle.com, jmario@...hat.com Subject: Re: [PATCH] perf: Fallback to MAP__FUNCTION if daddr maps are NULL On Wed, Aug 20, 2014 at 11:25:11PM -0400, Don Zickus wrote: > As we run "perf c2c" on more applications, we noticed we're missing significant > samples from a common customer's application. Looking at the > /proc/<pid>/maps file for the app, we see "rwxs" and "rwxp" permissions on many > of the shared memory & heap regions, and on all the thread stacks. > > Because those regions have the "x" bit set, perf marks them with a MAP_FUNCTION > type. Hence ip_resolve_data() never finds load or store events coming from > them. > > We fixed this by re-calling thread__find_addr_location with MAP__FUNCTION in > the case where map is NULL as a last ditch effort to map the sample before > giving up and dropping it. > > Reported-by: Joe Mario <jmario@...hat.com> > Tested-by: Joe Mario <jmario@...hat.com> > Signed-off-by: Don Zickus <dzickus@...hat.com> Acked-by: Jiri Olsa <jolsa@...nel.org> thanks, jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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