From: Peter Zijlstra <peterz@infradead.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Jiri Olsa <jolsa@redhat.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Mark Rutland <mark.rutland@arm.com>,
Stephane Eranian <eranian@google.com>,
LKML <linux-kernel@vger.kernel.org>,
linux-perf-users@vger.kernel.org, Tejun Heo <tj@kernel.org>,
Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature
Date: Fri, 20 Dec 2019 10:36:13 +0100 [thread overview]
Message-ID: <20191220093613.GD2844@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <20191220043253.3278951-3-namhyung@kernel.org>
On Fri, Dec 20, 2019 at 01:32:46PM +0900, Namhyung Kim wrote:
> 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.
>
> Cc: Tejun Heo <tj@kernel.org>
> Cc: Li Zefan <lizefan@huawei.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
> @@ -6895,6 +6901,18 @@ void perf_prepare_sample(struct perf_event_header *header,
> if (sample_type & PERF_SAMPLE_PHYS_ADDR)
> data->phys_addr = perf_virt_to_phys(data->addr);
>
> + if (sample_type & PERF_SAMPLE_CGROUP) {
> + u64 cgrp_id = 0;
> +#ifdef CONFIG_CGROUP_PERF
> + struct cgroup *cgrp;
> +
> + /* protected by RCU */
> + cgrp = task_css_check(current, perf_event_cgrp_id, 1)->cgroup;
> + cgrp_id = cgroup_id(cgrp);
> +#endif
> + data->cgroup = cgrp_id;
> + }
Would it make more sense to refuse SAMPLE_CGROUP if !CGROUP_PERF?
next prev parent reply other threads:[~2019-12-20 9:36 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-20 4:32 [PATCHSET 0/9] perf: Improve cgroup profiling (v2) Namhyung Kim
2019-12-20 4:32 ` [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event Namhyung Kim
2019-12-20 9:33 ` Peter Zijlstra
2019-12-20 11:28 ` Namhyung Kim
2019-12-20 11:50 ` Namhyung Kim
2019-12-20 15:16 ` Tejun Heo
2019-12-21 8:49 ` Namhyung Kim
2019-12-20 4:32 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-12-20 9:36 ` Peter Zijlstra [this message]
2019-12-20 15:23 ` Tejun Heo
2019-12-20 16:48 ` Peter Zijlstra
2019-12-20 16:59 ` Tejun Heo
2019-12-20 4:32 ` [PATCH 3/9] perf tools: Basic support for CGROUP event Namhyung Kim
2019-12-20 4:32 ` [PATCH 4/9] perf tools: Maintain cgroup hierarchy Namhyung Kim
2019-12-20 4:32 ` [PATCH 5/9] perf report: Add 'cgroup' sort key Namhyung Kim
2019-12-20 4:32 ` [PATCH 6/9] perf record: Support synthesizing cgroup events Namhyung Kim
2019-12-20 4:32 ` [PATCH 7/9] perf record: Add --all-cgroups option Namhyung Kim
2019-12-20 4:32 ` [PATCH 8/9] perf top: " Namhyung Kim
2019-12-20 4:32 ` [PATCH 9/9] perf script: Add --show-cgroup-events option Namhyung Kim
-- strict thread matches above, loose matches on Subject: below --
2020-03-25 12:45 [PATCHSET 0/9] perf: Improve cgroup profiling (v6) Namhyung Kim
2020-03-25 12:45 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2020-01-07 13:34 [PATCHSET 0/9] perf: Improve cgroup profiling (v4) Namhyung Kim
2020-01-07 13:34 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-12-23 6:07 [PATCHSET 0/9] perf: Improve cgroup profiling (v3) Namhyung Kim
2019-12-23 6:07 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-08-28 7:31 [PATCHSET 0/9] perf: Improve cgroup profiling (v1) Namhyung Kim
2019-08-28 7:31 ` [PATCH 2/9] perf/core: Add PERF_SAMPLE_CGROUP feature Namhyung Kim
2019-08-28 14:49 ` Tejun Heo
2019-08-31 3:03 ` Namhyung Kim
2019-08-31 4:58 ` Tejun Heo
2019-09-03 2:13 ` Namhyung Kim
2019-09-05 16:56 ` Tejun Heo
2019-09-08 13:28 ` Namhyung Kim
2019-09-14 14:02 ` Song Liu
2019-09-16 15:23 ` Tejun Heo
2019-09-19 6:42 ` Song Liu
2019-09-20 8:47 ` Namhyung Kim
2019-09-20 16:13 ` Song Liu
2019-09-20 21:04 ` Tejun Heo
2019-10-02 6:28 ` Namhyung Kim
2019-10-07 14:16 ` Tejun Heo
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