diff options
| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-07-02 22:14:33 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-07-02 23:38:37 +0400 |
| commit | c20ab37ef30f4a874cf27e84c12c73e584e6f5cc (patch) | |
| tree | 47f4d893d09727e387ac6742cc20156302e9c3fa /tools/perf/util/callchain.h | |
| parent | 4eb3e4788b8a5e220a0aeb590f88c28850726ebe (diff) | |
| download | linux-c20ab37ef30f4a874cf27e84c12c73e584e6f5cc.tar.xz | |
perf_counter tools: Set the minimum percent for callchains to be displayed
Callchains output may become a burden on a trace because even
rarely hit site are exposed. This can be too much information.
Let the user set a threshold as a minimum percent of hits using
the new pattern for the -c option:
-c mode,min_percent
Example:
$ perf report -s sym -c flat,4
8.25% [k] copy_user_generic_string
4.19%
copy_user_generic_string
generic_file_aio_read
do_sync_read
vfs_read
sys_pread64
system_call_fastpath
pread64
5.39% [k] search_by_key
4.63% 0x00000000009e0a
2.36% [k] memcpy_c
[...]
$ perf report -s sym -c graph,2
8.25% [k] copy_user_generic_string
|
|--4.31%-- generic_file_aio_read
| do_sync_read
| vfs_read
| |
| --4.19%-- sys_pread64
| system_call_fastpath
| pread64
|
--3.24%-- generic_file_buffered_write
__generic_file_aio_write_nolock
generic_file_aio_write
do_sync_write
reiserfs_file_write
vfs_write
|
--3.14%-- sys_pwrite64
system_call_fastpath
__pwrite64
5.39% [k] search_by_key
|
--2.23%-- reiserfs_update_sd_size
4.63% 0x00000000009e0a
2.36% [k] memcpy_c
[...]
You can also omit it and it will default to 0.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Anton Blanchard <anton@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <1246558475-10624-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/callchain.h')
| -rw-r--r-- | tools/perf/util/callchain.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/tools/perf/util/callchain.h b/tools/perf/util/callchain.h index dfa56008d9ad..f3e4776e7430 100644 --- a/tools/perf/util/callchain.h +++ b/tools/perf/util/callchain.h @@ -38,6 +38,8 @@ static inline void callchain_init(struct callchain_node *node) void append_chain(struct callchain_node *root, struct ip_callchain *chain, struct symbol **syms); -void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node); -void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node); +void sort_chain_flat(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit); +void sort_chain_graph(struct rb_root *rb_root, struct callchain_node *node, + u64 min_hit); #endif |