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| author | Kan Liang <kan.liang@linux.intel.com> | 2021-02-02 12:09:10 -0800 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-02-08 16:25:00 -0300 |
| commit | 590db42de068a1d11e51bd0796a9044621aeed2e (patch) | |
| tree | 8a08575b6be5ba31cdbbaae1c95eda72f623cf82 /tools/perf/Documentation | |
| parent | ea8d0ed6eae37b01953a29bca98112d9e2507a84 (diff) | |
| download | linux-590db42de068a1d11e51bd0796a9044621aeed2e.tar.gz | |
perf report: Support instruction latency
The instruction latency information can be recorded on some platforms, e.g., the Intel Sapphire Rapids server. With both memory latency (weight) and the new instruction latency information, users can easily locate the expensive load instructions, and also understand the time spent in different stages. The users can optimize their applications in different pipeline stages. The 'weight' field is shared among different architectures. Reusing the 'weight' field may impacts other architectures. Add a new field to store the instruction latency. Like the 'weight' support, introduce a 'ins_lat' for the global instruction latency, and a 'local_ins_lat' for the local instruction latency version. Add new sort functions, INSTR Latency and Local INSTR Latency, accordingly. Add local_ins_lat to the default_mem_sort_order[]. Signed-off-by: Kan Liang <kan.liang@linux.intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Jin Yao <yao.jin@linux.intel.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Madhavan Srinivasan <maddy@linux.vnet.ibm.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/1612296553-21962-7-git-send-email-kan.liang@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-report.txt | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-report.txt b/tools/perf/Documentation/perf-report.txt index b9686a131ed8..f546b5e9db05 100644 --- a/tools/perf/Documentation/perf-report.txt +++ b/tools/perf/Documentation/perf-report.txt @@ -109,6 +109,9 @@ OPTIONS - time: Separate the samples by time stamp with the resolution specified by --time-quantum (default 100ms). Specify with overhead and before it. - code_page_size: the code page size of sampled code address (ip) + - ins_lat: Instruction latency in core cycles. This is the global instruction + latency + - local_ins_lat: Local instruction latency version By default, comm, dso and symbol keys are used. (i.e. --sort comm,dso,symbol) @@ -155,7 +158,8 @@ OPTIONS - blocked: reason of blocked load access for the data at the time of the sample And the default sort keys are changed to local_weight, mem, sym, dso, - symbol_daddr, dso_daddr, snoop, tlb, locked, blocked, see '--mem-mode'. + symbol_daddr, dso_daddr, snoop, tlb, locked, blocked, local_ins_lat, + see '--mem-mode'. If the data file has tracepoint event(s), following (dynamic) sort keys are also available: |