linux-kernel - Re: [PATCH] perf/core: fix RCU issues with cgroup monitoring mode

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Message-ID: <20151017100054.GF3816@twins.programming.kicks-ass.net>
Date:	Sat, 17 Oct 2015 12:00:54 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, ak@...ux.intel.com,
	edumazet@...gle.com, acme@...hat.com
Subject: Re: [PATCH] perf/core: fix RCU issues with cgroup monitoring mode

On Sat, Oct 17, 2015 at 03:28:11AM +0200, Stephane Eranian wrote:
>  static int __perf_cgroup_move(void *info)
>  {
>  	struct task_struct *task = info;
> +	rcu_read_lock();
>  	perf_cgroup_switch(task, PERF_CGROUP_SWOUT | PERF_CGROUP_SWIN);
> +	rcu_read_unlock();
>  	return 0;
>  }

On second thought, how can this be right? Surely the cgroup system has
cgroups stabilized over calling ->attach() ?


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