linux-kernel - Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

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Message-ID: <20070814221616.GG23308@one.firstfloor.org>
Date:	Wed, 15 Aug 2007 00:16:16 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC 4/9] Atomic reclaim: Save irq flags in vmscan.c

On Tue, Aug 14, 2007 at 03:07:10PM -0700, Christoph Lameter wrote:
> There are more spinlocks needed. So we would just check the whole bunch 
> and fail if any of them are used?

Yes zone_flag would apply to all of them.

> 
> > 		do things with zone locks 
> > 	}
> > 
> > The interrupt handler shouldn't touch zone_flag. If it wants
> > to it would need to be converted to a local_t and incremented/decremented
> > (should be about the same cost at least on architectures with sane
> > local_t implementation) 
> 
> That would mean we need to fork the code for reclaim?

Not with the local_t increment.

-Andi
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