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Date: Mon, 26 Apr 2010 15:33:33 -0700 From: Andrew Morton <akpm@...ux-foundation.org> To: Pavel Machek <pavel@....cz> Cc: Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>, linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: swapping when there's a free memory On Sun, 25 Apr 2010 09:13:49 +0200 Pavel Machek <pavel@....cz> wrote: > Hi! > > > I captured this output of vmstat. The machine was freeing cache and > > swapping out pages even when there was a plenty of free memory. > > > > The machine is sparc64 with 1GB RAM with 2.6.34-rc4. This abnormal > > swapping happened during running spadfsck --- a fsck program for a custom > > filesystem that caches most reads in its internal cache --- so it reads > > buffers and allocates memory at the same time. > > > > Note that sparc64 doesn't have any low/high memory zones, so it couldn't > > be explained by filling one zone and needing to allocate pages in it. > > Fragmented memory + high-order allocation? Yeah, could be. I wonder which slab/slub/slob implementation you're using, and what page sizes it uses for dentries, inodes, etc. Can you have a poke in /prob/slabinfo? > > This abnormal behavior doesn't happen everytime, it happend about twice > > for many spadfsck attempts. > > ...yep, that would be random. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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