Date: Wed, 24 Jun 2009 12:36:24 -0700
From: Andrew Morton <akpm@linux-foundation.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: penberg@cs.helsinki.fi, arjan@infradead.org, linux-kernel@vger.kernel.org,
       cl@linux-foundation.org, npiggin@suse.de
Subject: Re: upcoming kerneloops.org item: get_page_from_freelist
Message-Id: <20090624123624.26c93459.akpm@linux-foundation.org>
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On Wed, 24 Jun 2009 12:16:20 -0700 (PDT)
Linus Torvalds <torvalds@linux-foundation.org> wrote:

> Lookie here. This is 2.6.0:mm/page_alloc.c:
> 
>         do_retry = 0;
>         if (!(gfp_mask & __GFP_NORETRY)) {
>                 if ((order <= 3) || (gfp_mask & __GFP_REPEAT))
>                         do_retry = 1;
>                 if (gfp_mask & __GFP_NOFAIL)
>                         do_retry = 1;
>         }
>         if (do_retry) {
>                 blk_congestion_wait(WRITE, HZ/50);
>                 goto rebalance;
>         }

rebalance:
	if ((p->flags & (PF_MEMALLOC | PF_MEMDIE)) && !in_interrupt()) {
		/* go through the zonelist yet again, ignoring mins */
		for (i = 0; zones[i] != NULL; i++) {
			struct zone *z = zones[i];

			page = buffered_rmqueue(z, order, cold);
			if (page)
				goto got_pg;
		}
		goto nopage;
	}

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