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From: Peter Zijlstra <peterz@infradead.org>
To: Chris Wilson <chris@chris-wilson.co.uk>
Cc: linux-kernel@vger.kernel.org, Fengguang Wu <fengguang.wu@intel.com>
Subject: Re: [PATCH] locking/ww_mutex: Replace cpu_relax with cond_resched for tests
Date: Tue, 28 Feb 2017 10:48:53 +0100	[thread overview]
Message-ID: <20170228094853.GF6500@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20170228094011.2595-1-chris@chris-wilson.co.uk>

On Tue, Feb 28, 2017 at 09:40:11AM +0000, Chris Wilson wrote:
> When busy-spinning on a ww_mutex_trylock(), we depend upon the other
> thread advancing and releasing the lock. This can not happen on a single
> CPU unless we relinquish it.

Thanks, do you have any clue about those other ww-mutex test fails? So
far I've not had much luck poking at them.

  reply	other threads:[~2017-02-28  9:48 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-02-28  3:59 [locking/ww_mutex] f2a5fec173 EIP: __mutex_trylock Fengguang Wu
2017-02-28  8:53 ` Chris Wilson
2017-02-28  9:40 ` [PATCH] locking/ww_mutex: Replace cpu_relax with cond_resched for tests Chris Wilson
2017-02-28  9:48   ` Peter Zijlstra [this message]
2017-02-28  9:58     ` Chris Wilson
2017-03-02  8:20   ` [tip:locking/urgent] locking/ww_mutex: Replace cpu_relax() with cond_resched() " tip-bot for Chris Wilson

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