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| author | Anton Blanchard <anton@samba.org> | 2009-10-18 01:09:29 +0000 |
|---|---|---|
| committer | Paul Mackerras <paulus@samba.org> | 2009-10-28 16:13:03 +1100 |
| commit | f7d7986060b2890fc26db6ab5203efbd33aa2497 (patch) | |
| tree | 0ed63257afd3fd02d83ab481af35855603ac4790 /tools/perf/design.txt | |
| parent | 81cd5ae303e88a1e9d3a3e0f1fe8abd100edde16 (diff) | |
| download | lwn-f7d7986060b2890fc26db6ab5203efbd33aa2497.tar.gz lwn-f7d7986060b2890fc26db6ab5203efbd33aa2497.zip | |
perf_event: Add alignment-faults and emulation-faults software events
Add two more software events that are common to many cpus.
Alignment faults: When a load or store is not aligned properly.
Emulation faults: When an instruction is emulated in software.
Both cause a very significant slowdown (100x or worse), so identifying and
fixing them is very important.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'tools/perf/design.txt')
| -rw-r--r-- | tools/perf/design.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/design.txt b/tools/perf/design.txt index fdd42a824c98..f000c30877ac 100644 --- a/tools/perf/design.txt +++ b/tools/perf/design.txt @@ -137,6 +137,8 @@ enum sw_event_ids { PERF_COUNT_SW_CPU_MIGRATIONS = 4, PERF_COUNT_SW_PAGE_FAULTS_MIN = 5, PERF_COUNT_SW_PAGE_FAULTS_MAJ = 6, + PERF_COUNT_SW_ALIGNMENT_FAULTS = 7, + PERF_COUNT_SW_EMULATION_FAULTS = 8, }; Counters of the type PERF_TYPE_TRACEPOINT are available when the ftrace event |