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 <jma...@redhat.com> > Tested-by: Joe Mario <jma...@redhat.com> > Signed-off-by: Don Zickus <dzic...@redhat.com>
Acked-by: Jiri Olsa <jo...@kernel.org> thanks, jirka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
