linux-kernel - Re: [RFC] Remove temp

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Date:	Wed, 18 Oct 2006 03:42:38 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Martin Bligh <mbligh@...gle.com>
CC:	Andrew Morton <akpm@...l.org>, LKML <linux-kernel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC] Remove temp_priority

Martin Bligh wrote:
> This is not tested yet. What do you think?
> 
> This patch removes temp_priority, as it is racy. We're setting
> prev_priority from it, and yet temp_priority could have been
> set back to DEF_PRIORITY by another reclaimer.

I like it. I wonder if we should get kswapd to stick its priority
into the zone at the point where zone_watermark_ok becomes true,
rather than setting all zones to the lowest priority? That would
require a bit more logic though I guess.

For that matter (going off the topic a bit), I wonder if
try_to_free_pages should have a watermark check there too? This
might help reduce the latency issue you brought up where one process
has reclaimed a lot of pages, but another isn't making any progress
and has to go through the full priority range? Maybe that's
statistically pretty unlikely?

-- 
SUSE Labs, Novell Inc.
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