linux-kernel - Re: [PATCH 1/9] perf/core: Add PERF_RECORD

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Date:   Tue, 7 Jan 2020 13:51:31 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org, Tejun Heo <tj@...nel.org>,
        Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Subject: Re: [PATCH 1/9] perf/core: Add PERF_RECORD_CGROUP event

On Mon, Dec 23, 2019 at 03:07:51PM +0900, Namhyung Kim wrote:

> @@ -7564,6 +7567,105 @@ void perf_event_namespaces(struct task_struct *task)
>  			NULL);
>  }
>  
> +/*
> + * cgroup tracking
> + */
> +#ifdef CONFIG_CGROUPS
> +

<snip>

> +
> +#endif
> +
>  /*
>   * mmap tracking
>   */

> @@ -12581,6 +12685,12 @@ static void perf_cgroup_css_free(struct cgroup_subsys_state *css)
>  	kfree(jc);
>  }
>  
> +static int perf_cgroup_css_online(struct cgroup_subsys_state *css)
> +{
> +	perf_event_cgroup(css->cgroup);
> +	return 0;
> +}
> +
>  static int __perf_cgroup_move(void *info)
>  {
>  	struct task_struct *task = info;
> @@ -12602,6 +12712,7 @@ static void perf_cgroup_attach(struct cgroup_taskset *tset)
>  struct cgroup_subsys perf_event_cgrp_subsys = {
>  	.css_alloc	= perf_cgroup_css_alloc,
>  	.css_free	= perf_cgroup_css_free,
> +	.css_online	= perf_cgroup_css_online,
>  	.attach		= perf_cgroup_attach,
>  	/*
>  	 * Implicitly enable on dfl hierarchy so that perf events can

CONFIG_CGROUPS vs CONFIG_CGROUP_PERF ?

Other than that, I see nothing wrong here.