linux-kernel - [PATCH] Use min of two prio settings in calculating distress for reclaim

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Message-ID: <4534323F.5010103@google.com>
Date:	Mon, 16 Oct 2006 18:30:39 -0700
From:	Martin Bligh <mbligh@...gle.com>
To:	Andrew Morton <akpm@...l.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linux Memory Management <linux-mm@...ck.org>
Subject: [PATCH] Use min of two prio settings in calculating distress for
 reclaim

Another bug is that if try_to_free_pages / balance_pgdat are called
with a gfp_mask specifying GFP_IO and/or GFP_FS, they may reclaim
the requisite number of pages, and reset prev_priority to DEF_PRIORITY.

However, another reclaimer without those gfp_mask flags set may still
be struggling to reclaim pages. The easy fix for this is to key the
distress calculation not off zone->prev_priority, but also take into
account the local caller's priority by using:
min(zone->prev_priority, sc->priority)

Signed-off-by: Martin J. Bligh <mbligh@...gle.com>

View attachment "2.6.18-min_prio" of type "text/plain" (1480 bytes)