linux-kernel - Re: [PATCH 0/4] munmap: Flexible mem unmap operation interface for scheduling latency

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Message-ID: <1303802720.20212.7.camel@twins>
Date:	Tue, 26 Apr 2011 09:25:20 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Geunsik Lim <leemgs1@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>, Hugh Dickins <hughd@...gle.com>,
	Darren Hart <dvhart@...ux.intel.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>
Subject: Re: [PATCH 0/4] munmap: Flexible mem unmap operation interface for
 scheduling latency

On Mon, 2011-04-25 at 16:29 -0400, Steven Rostedt wrote:
> On Mon, 2011-04-25 at 21:47 +0200, Peter Zijlstra wrote:
> 
> > Also, -rt doesn't care since it already has preemptible mmu_gather.
> 
> To be fair, he did state:
> 
> >     In general, This is not a critical latency-path on preemption mode
> >     (PREEMPT_VOLUNTARY / PREEMPT_DESKTOP / PREEMPT_RT)

That doesn't parse for me... what does it say? The only one not listed
is the non-preempt option, that wouldn't reschedule no matter what
ZAP_BLOCK_SIZE.
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