From c199c11dce197b12ff884ac0cfcb527b1164788b Mon Sep 17 00:00:00 2001 From: Agustin Vega-Frias Date: Tue, 6 Mar 2018 09:04:44 -0500 Subject: perf pmu: Auto-merge PMU events created by prefix or glob match Auto-merge for these events was disabled when auto-merging of non-alias events was disabled in commit 63ce844 (perf stat: Only auto-merge events that are PMU aliases). Non-merging of legacy events is preserved: $ perf stat -ag -e cache-misses,cache-misses sleep 1 Performance counter stats for 'system wide': 86,323 cache-misses 86,323 cache-misses 1.002623307 seconds time elapsed But prefix or glob matching auto-merges the events created: $ perf stat -a -e l3cache/read-miss/ sleep 1 Performance counter stats for 'system wide': 328 l3cache/read-miss/ 1.002627008 seconds time elapsed $ perf stat -a -e l3cache_0_[01]/read-miss/ sleep 1 Performance counter stats for 'system wide': 172 l3cache/read-miss/ 1.002627008 seconds time elapsed As with events created with aliases, auto-merging can be suppressed with the --no-merge option: $ perf stat -a -e l3cache/read-miss/ --no-merge sleep 1 Performance counter stats for 'system wide': 67 l3cache/read-miss/ 67 l3cache/read-miss/ 63 l3cache/read-miss/ 60 l3cache/read-miss/ 1.002622192 seconds time elapsed Signed-off-by: Agustin Vega-Frias Acked-by: Andi Kleen Acked-by: Jiri Olsa Cc: Alexander Shishkin Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Timur Tabi Cc: linux-arm-kernel@lists.infradead.org Change-Id: I0a47eed54c05e1982ca964d743b37f50f60c508c Link: http://lkml.kernel.org/r/1520345084-42646-4-git-send-email-agustinv@codeaurora.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-stat.txt | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) (limited to 'tools/perf/Documentation') diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 628026dbedc5..f15b306be183 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -267,11 +267,15 @@ taskset. --no-merge:: Do not merge results from same PMUs. -When multiple events are created from a single event alias, stat will, -by default, aggregate the event counts and show the result in a single -row. This option disables that behavior and shows the individual events -and counts. Aliases are listed immediately after the Kernel PMU events -by perf list. +When multiple events are created from a single event specification, +stat will, by default, aggregate the event counts and show the result +in a single row. This option disables that behavior and shows +the individual events and counts. + +Multiple events are created from a single event specification when: +1. Prefix or glob matching is used for the PMU name. +2. Aliases, which are listed immediately after the Kernel PMU events + by perf list, are used. --smi-cost:: Measure SMI cost if msr/aperf/ and msr/smi/ events are supported. -- cgit v1.2.3-59-g8ed1b