perf mem: enable simultaneous sampling of loads/stores
PATCH v2 1/1 perf mem: enable simultaneous sampling of loads/stores
This patch modifies perf mem to default to smapling loads and stores simultaneously. It could only do one or the other before yet there was not hardware restriction preventing simultaneous collection. With this patch, one run is sufficient to collect both.
It is still possible to smaple only loads or stores by using the -t option:
$ perf mem -t load rec $ perf mem -t load rep Or $ perf mem -t store rec $ perf mem -t store rep
The perf report TUI will show one event at a time. The store output will contain a Weight column which will be empty.
In V2, we update the man page and simplify the initialization of the argv vector to cmd_*().
--- tools/perf/Documentation/perf-mem.txt | 9 +-- tools/perf/builtin-mem.c | 123 +++++++++++++++++++++++++++------- 2 files changed, 105 insertions(+), 27 deletions(-)
tools/perf/Documentation/perf-mem.txt +5 -4
@@ -12,11 +12,12 @@ SYNOPSIS DESCRIPTION ----------- -"perf mem -t <TYPE> record" runs a command and gathers memory operation data +"perf mem record" runs a command and gathers memory operation data from it, into perf.data. Perf record options are accepted and are passed through. -"perf mem -t <TYPE> report" displays the result. It invokes perf report with the -right set of options to display a memory access profile. +"perf mem report" displays the result. It invokes perf report with the +right set of options to display a memory access profile. By default, loads +and stores are sampled. Use the -t option to limit to loads or stores. Note that on Intel systems the memory latency reported is the use-latency, not the pure load (or store latency). Use latency includes any pipeline
@@ -29,7 +30,7 @@ OPTIONS -t:: --type=:: - Select the memory operation type: load or store (default: load) + Select the memory operation type: load or store (default: load,store) -D:: --dump-raw-samples=::
tools/perf/builtin-mem.c +100 -23
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Signature · 1 line
1.9.1
Quoted 2 lines · Stephane Eranian
This patch modifies perf mem to default to smapling loads
s/smapling/sampling
Quoted 6 lines
and stores simultaneously. It could only do one or the other before yet there was not hardware restriction preventing simultaneous collection. With this patch, one run is sufficient to collect both.
It is still possible to smaple only loads or stores by using the
s/smaple/sample
Thanks,
Ingo