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perf machine: Fallback to MAP__FUNCTION if daddr maps are NULL

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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@redhat.com>
Tested-by: Joe Mario <jmario@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Joe Mario <jmario@redhat.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1408591511-57884-1-git-send-email-dzickus@redhat.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Don Zickus 2014-08-20 23:25:11 -04:00 committed by Arnaldo Carvalho de Melo
parent c09a7e755c
commit 06b2afc0b9
1 changed files with 10 additions and 0 deletions
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10
tools/perf/util/machine.c
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@ -1314,6 +1314,16 @@ static void ip__resolve_data(struct machine *machine, struct thread *thread,
thread__find_addr_location(thread, machine, m, MAP__VARIABLE, addr,
&al);
if (al.map == NULL) {
/*
* some shared data regions have execute bit set which puts
* their mapping in the MAP__FUNCTION type array.
* Check there as a fallback option before dropping the sample.
*/
thread__find_addr_location(thread, machine, m, MAP__FUNCTION, addr,
&al);
}
ams->addr = addr;
ams->al_addr = al.addr;
ams->sym = al.sym;