Date: Thu, 11 Dec 2008 18:47:53 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Al Viro <viro@zeniv.linux.org.uk>, yur@emcraft.com,
       linux-kernel@vger.kernel.org, linuxppc-dev@ozlabs.org,
       Geert.Uytterhoeven@sonycom.com, dhowells@redhat.com, miltonm@bga.com,
       wd@denx.de, dzu@denx.de, yanok@emcraft.com
Subject: Re: [PATCH][v2] fork_init: fix division by zero
Message-Id: <20081211184753.97d0db7a.akpm@linux-foundation.org>
In-Reply-To: <200812121331.34602.nickpiggin@yahoo.com.au>
References: <200812101950.51958.yur@emcraft.com>
	<20081211202800.GQ28946@ZenIV.linux.org.uk>
	<20081211124330.ff9b7483.akpm@linux-foundation.org>
	<200812121331.34602.nickpiggin@yahoo.com.au>
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 990
Lines: 23

On Fri, 12 Dec 2008 12:31:33 +1000 Nick Piggin <nickpiggin@yahoo.com.au> wrote:

> On Friday 12 December 2008 07:43, Andrew Morton wrote:
> > On Thu, 11 Dec 2008 20:28:00 +0000
> 
> > >  Do they actually cross the page boundaries?
> >
> > Some flavours of slab have at times done an order-1 allocation for
> > objects which would fit into an order-0 page (etc) if it looks like
> > that will be beneficial from a packing POV.  I'm unsure whether that
> > still happens - I tried to get it stamped out for reliability reasons.
> 
> Hmph, SLUB uses order-3 allocations for 832 byte sized objects
> by default here (mm struct).

That sucks, but at least it's <= PAGE_ALLOC_COSTLY_ORDER.

It's fortunate that everyone has more than 128GB of memory.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/