From mboxrd@z Thu Jan 1 00:00:00 1970 From: Glauber Costa Subject: Re: [PATCH] regression: vmalloc easily fail. Date: Wed, 29 Oct 2008 20:07:37 -0200 Message-ID: <20081029220737.GF11532@poweredge.glommer> References: <1225234513-3996-1-git-send-email-glommer@redhat.com> <20081028232944.GA3759@wotan.suse.de> <20081029094856.GD4269@poweredge.glommer> <20081029101145.GB5953@wotan.suse.de> <49083B14.6070402@redhat.com> <20081029104333.GD5953@wotan.suse.de> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Avi Kivity , linux-kernel@vger.kernel.org, kvm@vger.kernel.org, aliguori@codemonkey.ws, Jeremy Fitzhardinge , Krzysztof Helt To: Nick Piggin Return-path: Received: from mx2.redhat.com ([66.187.237.31]:40991 "EHLO mx2.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752464AbYJ2WGK (ORCPT ); Wed, 29 Oct 2008 18:06:10 -0400 Content-Disposition: inline In-Reply-To: <20081029104333.GD5953@wotan.suse.de> Sender: kvm-owner@vger.kernel.org List-ID: On Wed, Oct 29, 2008 at 11:43:33AM +0100, Nick Piggin wrote: > On Wed, Oct 29, 2008 at 12:29:40PM +0200, Avi Kivity wrote: > > Nick Piggin wrote: > > >Hmm, spanning <30MB of memory... how much vmalloc space do you have? > > > > > > > > > > From the original report: > > > > >VmallocTotal: 122880 kB > > >VmallocUsed: 15184 kB > > >VmallocChunk: 83764 kB > > > > So it seems there's quite a bit of free space. > > > > Chunk is the largest free contiguous region, right? If so, it seems the > > Yes. > > > > problem is unrelated to guard pages, instead the search isn't finding a > > 1-page area (with two guard pages) for some reason, even though lots of > > free space is available. > > Hmm. The free area search could be buggy... Do you want me to grab any specific info of it? Or should I just hack myself randomly into it? I'll probably have some time for that tomorrow.