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| author | Steven Rostedt <srostedt@redhat.com> | 2008-11-21 01:30:54 -0500 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-11-23 11:41:01 +0100 |
| commit | 2bcd521a684cc94befbe2ce7d5b613c841b0d304 (patch) | |
| tree | 63bc4dbc52defa27c8cac9e46dddadfcb36c1c7a /mm/slub.c | |
| parent | bac28bfe42ba98ee67503f78984d1d5e1ebbbb78 (diff) | |
trace: profile all if conditionals
Impact: feature to profile if statements
This patch adds a branch profiler for all if () statements.
The results will be found in:
/debugfs/tracing/profile_branch
For example:
miss hit % Function File Line
------- --------- - -------- ---- ----
0 1 100 x86_64_start_reservations head64.c 127
0 1 100 copy_bootdata head64.c 69
1 0 0 x86_64_start_kernel head64.c 111
32 0 0 set_intr_gate desc.h 319
1 0 0 reserve_ebda_region head.c 51
1 0 0 reserve_ebda_region head.c 47
0 1 100 reserve_ebda_region head.c 42
0 0 X maxcpus main.c 165
Miss means the branch was not taken. Hit means the branch was taken.
The percent is the percentage the branch was taken.
This adds a significant amount of overhead and should only be used
by those analyzing their system.
Signed-off-by: Steven Rostedt <srostedt@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'mm/slub.c')
0 files changed, 0 insertions, 0 deletions