From 528b9cab3b813a3b94a4af14845308f720eb13fd Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Mon, 25 Jul 2022 11:31:22 -0700 Subject: perf lock: Add 'contention' subcommand The 'perf lock contention' processes the lock contention events and displays the result like perf lock report. Right now, there's not much difference between the two but the lock contention specific features will come soon. $ perf lock contention contended total wait max wait avg wait type caller 238 1.41 ms 29.20 us 5.94 us spinlock update_blocked_averages+0x4c 1 902.08 us 902.08 us 902.08 us rwsem:R do_user_addr_fault+0x1dd 81 330.30 us 17.24 us 4.08 us spinlock _nohz_idle_balance+0x172 2 89.54 us 61.26 us 44.77 us spinlock do_anonymous_page+0x16d 24 78.36 us 12.27 us 3.27 us mutex pipe_read+0x56 2 71.58 us 59.56 us 35.79 us spinlock __handle_mm_fault+0x6aa 6 25.68 us 6.89 us 4.28 us spinlock do_idle+0x28d 1 18.46 us 18.46 us 18.46 us rtmutex exec_fw_cmd+0x21b 3 15.25 us 6.26 us 5.08 us spinlock tick_do_update_jiffies64+0x2c Signed-off-by: Namhyung Kim Cc: Boqun Feng Cc: Davidlohr Bueso Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Olsa Cc: Peter Zijlstra Cc: Waiman Long Cc: Will Deacon Link: https://lore.kernel.org/r/20220725183124.368304-4-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-lock.txt | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'tools/perf/Documentation/perf-lock.txt') diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index 4b8568f0c53b..da0bcbc676a3 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -8,7 +8,7 @@ perf-lock - Analyze lock events SYNOPSIS -------- [verse] -'perf lock' {record|report|script|info} +'perf lock' {record|report|script|info|contention} DESCRIPTION ----------- @@ -27,6 +27,8 @@ and statistics with this 'perf lock' command. 'perf lock info' shows metadata like threads or addresses of lock instances. + 'perf lock contention' shows contention statistics. + COMMON OPTIONS -------------- -- cgit v1.2.3-59-g8ed1b