linux-kernel - Re: [PATCH v3 05/10] perf/cgroup: Grow per perf_cpu

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Date:   Thu, 14 Nov 2019 10:54:28 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Masahiro Yamada <yamada.masahiro@...ionext.com>,
        Kees Cook <keescook@...omium.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Petr Mladek <pmladek@...e.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Qian Cai <cai@....pw>, Joe Lawrence <joe.lawrence@...hat.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Sri Krishna chowdary <schowdary@...dia.com>,
        "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Changbin Du <changbin.du@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Kent Overstreet <kent.overstreet@...il.com>,
        Gary Hook <Gary.Hook@....com>, Arnd Bergmann <arnd@...db.de>,
        Kan Liang <kan.liang@...ux.intel.com>,
        linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3 05/10] perf/cgroup: Grow per perf_cpu_context heap
 storage

On Wed, Nov 13, 2019 at 04:30:37PM -0800, Ian Rogers wrote:
> Allow the per-CPU min heap storage to have sufficient space for per-cgroup
> iterators.
> 
> Based-on-work-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  kernel/events/core.c | 47 ++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 47 insertions(+)
> 
> diff --git a/kernel/events/core.c b/kernel/events/core.c
> index 0dab60bf5935..3c44be7de44e 100644
> --- a/kernel/events/core.c
> +++ b/kernel/events/core.c
> @@ -892,6 +892,47 @@ static inline void perf_cgroup_sched_in(struct task_struct *prev,
>  	rcu_read_unlock();
>  }
>  
> +static int perf_cgroup_ensure_itr_storage_cap(struct perf_event *event,

That's a ludicrous function name.

> +					struct cgroup_subsys_state *css)
> +{