linux-kernel - Re: [RFC V2 PATCH] kernfs: create raw version kernfs_path_len and kernfs

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Message-ID: <20160227111719.GV3965@htj.duckdns.org>
Date:	Sat, 27 Feb 2016 06:17:19 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Yang Shi <yang.shi@...aro.org>
Cc:	gregkh@...uxfoundation.org, lizefan@...wei.com, tglx@...utronix.de,
	rostedt@...dmis.org, bigeasy@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org,
	linaro-kernel@...ts.linaro.org
Subject: Re: [RFC V2 PATCH] kernfs: create raw version kernfs_path_len and
 kernfs_path

Hello,

On Fri, Feb 26, 2016 at 01:47:39PM -0800, Yang Shi wrote:
> Call synchronize_sched() when kernfs_node is updated since tracepoints are
> protected by rcu_read_lock_sched.

Adding synchronize_sched() to operations which can be triggered from
userland usually turns out to be problematic.  If this can't be solved
any other way, I think the right thing to do is replacing the path
with cgroup id as Christoph suggested.

Thanks.

-- 
tejun