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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2010-07-08 06:06:17 +0200 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-07-08 06:20:15 +0200 |
| commit | 97aa1052739c6a06cb6b0467dbf410613d20bc97 (patch) | |
| tree | 1bcf54fbe3fe39b6941f898a6927b6ac14df9996 | |
| parent | 869599ceda4a035cdb3345c563b74cdeef10f790 (diff) | |
| download | linux-3.10-97aa1052739c6a06cb6b0467dbf410613d20bc97.tar.gz linux-3.10-97aa1052739c6a06cb6b0467dbf410613d20bc97.tar.bz2 linux-3.10-97aa1052739c6a06cb6b0467dbf410613d20bc97.zip | |
perf: Resurrect flat callchains
Initialize the callchain radix tree root correctly.
When we walk through the parents, we must stop after the root, but
since it wasn't well initialized, its parent pointer was random.
Also the number of hits was random because uninitialized, hence it
was part of the callchain while the root doesn't contain anything.
This fixes segfaults and percentages followed by empty callchains
while running:
perf report -g flat
Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: 2.6.31.x-2.6.34.x <stable@kernel.org>
| -rw-r--r-- | tools/perf/util/callchain.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h index 1ca73e4a272..22dbaec003d 100644 --- a/tools/perf/util/callchain.h +++ b/tools/perf/util/callchain.h @@ -49,6 +49,9 @@ static inline void callchain_init(struct callchain_node *node) INIT_LIST_HEAD(&node->brothers); INIT_LIST_HEAD(&node->children); INIT_LIST_HEAD(&node->val); + + node->parent = NULL; + node->hit = 0; } static inline u64 cumul_hits(struct callchain_node *node) |