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Message-ID: <84144f020809191507w64ff1c47m40c2c500da3fdfa6@mail.gmail.com> Date: Sat, 20 Sep 2008 01:07:55 +0300 From: "Pekka Enberg" <penberg@...helsinki.fi> To: "Christoph Lameter" <cl@...ux-foundation.org> Cc: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org, linux-mm@...ck.org, jeremy@...p.org, ebiederm@...ssion.com, travis@....com, herbert@...dor.apana.org.au, xemul@...nvz.org Subject: Re: [patch 3/3] Increase default reserve percpu area On Sat, Sep 20, 2008 at 1:02 AM, Pekka Enberg <penberg@...helsinki.fi> wrote: > On Fri, Sep 19, 2008 at 11:37 PM, Christoph Lameter > <cl@...ux-foundation.org> wrote: >> SLUB now requires a portion of the per cpu reserve. There are on average >> about 70 real slabs on a system (aliases do not count) and each needs 12 bytes >> of per cpu space. Thats 840 bytes. In debug mode all slabs will be real slabs >> which will make us end up with 150 -> 1800. Give it some slack and add 2000 >> bytes to the default size. >> >> Things work fine without this patch but then slub will reduce the percpu reserve >> for modules. > > Hmm, shouldn't this be dynamically configured at runtime by > multiplying the number of possible CPUs with some constant? Oh, never mind, setup_per_cpu_areas() already does that, obviously. -- 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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