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| author | Andi Kleen <ak@linux.intel.com> | 2013-08-22 01:47:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-04 10:06:07 +0200 |
| commit | 4cabc3d1cb6a46f581a2628d1d11c483d5f300e5 (patch) | |
| tree | 5daa1d88dd0cfa62433f7d6149f5f96c6a3fc33d /tools/perf/Documentation/perf-stat.txt | |
| parent | perf: Enforce 1 as lower limit for perf_event_max_sample_rate (diff) | |
| download | linux-4cabc3d1cb6a46f581a2628d1d11c483d5f300e5.tar.xz linux-4cabc3d1cb6a46f581a2628d1d11c483d5f300e5.zip | |
tools/perf/stat: Add perf stat --transaction
Add support to perf stat to print the basic transactional execution statistics:
Total cycles, Cycles in Transaction, Cycles in aborted transsactions
using the in_tx and in_tx_checkpoint qualifiers.
Transaction Starts and Elision Starts, to compute the average transaction
length.
This is a reasonable overview over the success of the transactions.
Also support architectures that have a transaction aborted cycles
counter like POWER8. Since that is awkward to handle in the kernel
abstract handle both cases here.
Enable with a new --transaction / -T option.
This requires measuring these events in a group, since they depend on each
other.
This is implemented by using TM sysfs events exported by the kernel
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Arnaldo Carvalho de Melo <acme@infradead.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1377128846-977-5-git-send-email-andi@firstfloor.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/perf/Documentation/perf-stat.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 73c9759005a3..80c7da6732f2 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -137,6 +137,11 @@ core number and the number of online logical processors on that physical process After starting the program, wait msecs before measuring. This is useful to filter out the startup phase of the program, which is often very different. +-T:: +--transaction:: + +Print statistics of transactional execution if supported. + EXAMPLES -------- |