diff options
| author | Andi Kleen <ak@linux.intel.com> | 2014-02-28 09:02:14 -0500 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2014-03-14 10:20:44 -0400 |
| commit | b63940970492f5f187d546e191bc2c6831491fe3 (patch) | |
| tree | 7cb6844706b7bcb238ccbad8fb311a27803836c8 /tools | |
| parent | 0fb298cf95c0d8119557b7d4657724a146e0622e (diff) | |
perf mem: Clarify load-latency in documentation
Clarify in the documentation that 'perf mem report' reports use-latency,
not load/store-latency on Intel systems.
This often causes confusion with users.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1393596135-4227-2-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/Documentation/perf-mem.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-mem.txt b/tools/perf/Documentation/perf-mem.txt index 888d51137fbe..1d78a4064da4 100644 --- a/tools/perf/Documentation/perf-mem.txt +++ b/tools/perf/Documentation/perf-mem.txt | |||
| @@ -18,6 +18,10 @@ from it, into perf.data. Perf record options are accepted and are passed through | |||
| 18 | "perf mem -t <TYPE> report" displays the result. It invokes perf report with the | 18 | "perf mem -t <TYPE> report" displays the result. It invokes perf report with the |
| 19 | right set of options to display a memory access profile. | 19 | right set of options to display a memory access profile. |
| 20 | 20 | ||
| 21 | Note that on Intel systems the memory latency reported is the use-latency, | ||
| 22 | not the pure load (or store latency). Use latency includes any pipeline | ||
| 23 | queueing delays in addition to the memory subsystem latency. | ||
| 24 | |||
| 21 | OPTIONS | 25 | OPTIONS |
| 22 | ------- | 26 | ------- |
| 23 | <command>...:: | 27 | <command>...:: |