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Message-ID: <alpine.DEB.1.10.0906111140080.24376@gentwo.org> Date: Thu, 11 Jun 2009 11:49:19 -0400 (EDT) From: Christoph Lameter <cl@...ux-foundation.org> To: Pekka Enberg <penberg@...helsinki.fi> cc: linux-kernel@...r.kernel.org, mel@....ul.ie, Larry.Finger@...inger.net Subject: Re: [PATCH 2/2] SLUB: Disable debugging if it increases the minimum page order On Thu, 11 Jun 2009, Pekka Enberg wrote: > My main point is that a lot of _testers_ will probably enable all SLUB > debugging by default because we encourage them to and it's pretty bad > that we end up causing order 1 allocations and oom conditions. Other test methods (like PAGE_ALLOC debugging) also have significant side effects. > So I still think we need to fix _at minimum_ the kmalloc-4096 case > (assuming Larry won't hit the same problem still). I see you're not > happy with my patch so any suggestions how to handle that? Add a warning to Kconfig that the higher order page allocations may increase with debugging on for caches with object sizes near or equal to PAGE_SIZE? Its good to run with full debugging on for even the 4k sized caches. Otherwise we wont be catching overruns there. But the debugging can cause some side effects. -- 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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