From 6546b19f95acc986807de981402bbac6b3a94b0f Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Wed, 25 Mar 2020 21:45:29 +0900 Subject: perf/core: Add PERF_SAMPLE_CGROUP feature The PERF_SAMPLE_CGROUP bit is to save (perf_event) cgroup information in the sample. It will add a 64-bit id to identify current cgroup and it's the file handle in the cgroup file system. Userspace should use this information with PERF_RECORD_CGROUP event to match which cgroup it belongs. I put it before PERF_SAMPLE_AUX for simplicity since it just needs a 64-bit word. But if we want bigger samples, I can work on that direction too. Committer testing: $ pahole perf_sample_data | grep -w cgroup -B5 -A5 /* --- cacheline 4 boundary (256 bytes) was 56 bytes ago --- */ struct perf_regs regs_intr; /* 312 16 */ /* --- cacheline 5 boundary (320 bytes) was 8 bytes ago --- */ u64 stack_user_size; /* 328 8 */ u64 phys_addr; /* 336 8 */ u64 cgroup; /* 344 8 */ /* size: 384, cachelines: 6, members: 22 */ /* padding: 32 */ }; $ Signed-off-by: Namhyung Kim Tested-by: Arnaldo Carvalho de Melo Acked-by: Peter Zijlstra (Intel) Acked-by: Tejun Heo Cc: Alexander Shishkin Cc: Jiri Olsa Cc: Johannes Weiner Cc: Mark Rutland Cc: Zefan Li Link: http://lore.kernel.org/lkml/20200325124536.2800725-3-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- init/Kconfig | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'init/Kconfig') diff --git a/init/Kconfig b/init/Kconfig index 20a6ac33761c..7766b06a0038 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -1027,7 +1027,8 @@ config CGROUP_PERF help This option extends the perf per-cpu mode to restrict monitoring to threads which belong to the cgroup specified and run on the - designated cpu. + designated cpu. Or this can be used to have cgroup ID in samples + so that it can monitor performance events among cgroups. Say N if unsure. -- cgit v1.2.3