perf tools: callchain: Fix spurious 'perf report' warnings: ignore empty callchains
commitb0efe213f84f7fd5ccfe07053e3d9fb827b7c188
authorFrederic Weisbecker <fweisbec@gmail.com>
Sat, 8 Aug 2009 00:16:23 +0000 (8 02:16 +0200)
committerIngo Molnar <mingo@elte.hu>
Sun, 9 Aug 2009 10:54:41 +0000 (9 12:54 +0200)
tree652a2d089e6c964b963409c1bf4186d4cdc67daa
parent266e0e219888420a1a7cafc82e82891cf7b5a979
perf tools: callchain: Fix spurious 'perf report' warnings: ignore empty callchains

When the callchain tree comes to insert an empty backtrace, it
raises a spurious warning about the fact we are inserting an
empty. This is spurious because the radix tree assumes it did
something wrong to reach this state. But it didn't, we just met
an empty callchain that has to be ignored.

This happens occasionally with certain types of call-chain
recordings. If it happens it's a big nuisance as perf report
output starts with thousands of warning lines.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <1249690585-9145-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
tools/perf/util/callchain.c