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Date: Wed, 25 Aug 2010 20:12:04 -0700 (PDT) From: David Rientjes <rientjes@...gle.com> To: Christoph Lameter <cl@...ux.com> cc: Peter Zijlstra <peterz@...radead.org>, Dave Chinner <david@...morbit.com>, "Ted Ts'o" <tytso@....edu>, Jens Axboe <jaxboe@...ionio.com>, Andrew Morton <akpm@...ux-foundation.org>, Neil Brown <neilb@...e.de>, Alasdair G Kergon <agk@...hat.com>, Chris Mason <chris.mason@...cle.com>, Steven Whitehouse <swhiteho@...hat.com>, Jan Kara <jack@...e.cz>, Frederic Weisbecker <fweisbec@...il.com>, "linux-raid@...r.kernel.org" <linux-raid@...r.kernel.org>, "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>, "cluster-devel@...hat.com" <cluster-devel@...hat.com>, "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>, "reiserfs-devel@...r.kernel.org" <reiserfs-devel@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [patch 1/5] mm: add nofail variants of kmalloc kcalloc and kzalloc On Wed, 25 Aug 2010, Christoph Lameter wrote: > > Right, I thought you said the slab layer passes __GFP_NOFAIL when there's > > no objects available. > > Yes, the slab layer calls the page allocator when there are no objects > available and passes the __GFP_NOFAIL that the user may have set in the > call to the page allocator. > > Why then add new functions that do the same? > Because we can remove the flag, remove branches from the page allocator slowpath, and none of these allocations actually are dependent on __GFP_NOFAIL since they are all under PAGE_ALLOC_COSTLY_ORDER. -- 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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