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Date: Wed, 8 Nov 2017 23:57:12 -0800 From: Stephane Eranian <eranian@...gle.com> To: linux-kernel@...r.kernel.org Cc: acme@...hat.com, peterz@...radead.org, mingo@...e.hu, ak@...ux.intel.com, kan.liang@...el.com, jolsa@...hat.com Subject: [PATCH v4 4/5] perf/record: add documentation for using PERF_SAMPLE_SKID_IP This patch adds documentation to describe how to use the skid ip support with perf record. The sample type can be provided per event as follows: pmu_instance/...,skid-ip=1/ For instance on Intel X86: $ perf record -e cpu/event=0xc5,skid-ip=1/pp does record the precise address of retired branches and their target. Signed-off-by: Stephane Eranian <eranian@...gle.com> --- tools/perf/Documentation/perf-record.txt | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 5a626ef666c2..f0e3636dc4be 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -57,6 +57,14 @@ OPTIONS FP mode, "dwarf" for DWARF mode, "lbr" for LBR mode and "no" for disable callgraph. - 'stack-size': user stack size for dwarf mode + - 'skid-ip' : boolean, captures the unmodified interrupt instruction pointer + (IP) in each sample. Usually with event-based sampling, the IP + has skid and rarely point to the instruction which caused the + event to overflow. On some architectures, the hardware can eliminate + the skid and perf_events returns it as the IP with precise sampling is + enabled. But for certain measurements, it may be useful to have both + the correct and skid ip. This option enable capturing the skid ip in + additional to the corrected ip. Default is: false See the linkperf:perf-list[1] man page for more parameters. -- 2.7.4
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