linux-kernel - Re: [regression, 3.16-rc] rwsem: optimistic spinning causing performance degradation

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Message-ID: <1404530065.2572.8.camel@j-VirtualBox>
Date:	Fri, 04 Jul 2014 20:14:25 -0700
From:	Jason Low <jason.low2@...com>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	Dave Chinner <david@...morbit.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [regression, 3.16-rc] rwsem: optimistic spinning causing
 performance degradation

On Fri, 2014-07-04 at 01:53 -0700, Davidlohr Bueso wrote:
> On Fri, 2014-07-04 at 00:06 -0700, Jason Low 
> > Subject: [PATCH] rwsem: In rwsem_can_spin_on_owner(), return false if no owner
> 
> Could we change the subject to something more descriptive, ie:
> 
> rwsem: Allow conservative optimistic spinning for reader/writer paths

Sure, a Subject like this would better explain what is the effect of the
patch.

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