linux-kernel - Re: [patch] rt: res

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Date:	Thu, 12 Feb 2009 18:29:09 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	balbir@...ux.vnet.ibm.com
Cc:	Ingo Molnar <mingo@...e.hu>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...x.de>,
	LKML <linux-kernel@...r.kernel.org>,
	rt-users <linux-rt-users@...r.kernel.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Carsten Emde <ce@...g.ch>, Clark Williams <williams@...hat.com>
Subject: Re: [patch] rt: res_counter fix, v2

On Thu, 2009-02-12 at 22:28 +0530, Balbir Singh wrote:

> > _nort() will just turn them into NOPs in essence.
> > 
> > The question is, are these local IRQ flags manipulations really needed
> > in this code, and if yes, why?
> 
> We needed the local IRQ flags, since these counters are updated from
> page fault context and from reclaim context with lru_lock held with
> IRQ's disabled. I've been thinking about replacing the spin lock with
> seq lock, but have not gotten to it yet.

Ah, in that case we can get away with _nort I think, as both those
contexts are preemptable on -rt.

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