linux-kernel - Re: [PATCH] timer: add_timer_on() should perform proper migration

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Message-ID: <20151104194346.GA32152@mtj.duckdns.org>
Date:	Wed, 4 Nov 2015 14:43:46 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	Chris Worley <chris.worley@...marydata.com>,
	linux-kernel@...r.kernel.org, bfields@...ldses.org,
	Michael Skralivetsky <michael.skralivetsky@...marydata.com>,
	Trond Myklebust <trond.myklebust@...marydata.com>,
	Shaohua Li <shli@...com>,
	Jeff Layton <jlayton@...chiereds.net>, kernel-team@...com
Subject: Re: [PATCH] timer: add_timer_on() should perform proper migration

Hello, Thomas.

On Wed, Nov 04, 2015 at 08:35:00PM +0100, Thomas Gleixner wrote:
> nice detective work. This has been there forever. I really wonder why
> nobody ever triggered this before.

I guess there weren't enough concurrent del/add_timer_on() combos.
Workqueue recently switched to always use add_timer_on() from its
timer function making that a lot more frequent for heavy
mod_delayed_work_on() users and that's when it started surfacing.

Thanks.

-- 
tejun
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