From mboxrd@z Thu Jan 1 00:00:00 1970 From: Christoph Lameter Subject: [16/17] Allow virtual fallback for buffer_heads Date: Tue, 18 Sep 2007 20:36:21 -0700 Message-ID: <20070919033643.996885990@sgi.com> References: <20070919033605.785839297@sgi.com> Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Christoph Hellwig , Mel Gorman Return-path: Received: from netops-testserver-4-out.sgi.com ([192.48.171.29]:54951 "EHLO relay.sgi.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752237AbXISDgo (ORCPT ); Tue, 18 Sep 2007 23:36:44 -0400 Cc: David Chinner , Jens Axboe Content-Disposition: inline; filename=vcompound_buffer_head Sender: linux-fsdevel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org This is in particular useful for large I/Os because it will allow > 100 allocs from the SLUB fast path without having to go to the page allocator. Signed-off-by: Christoph Lameter --- fs/buffer.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) Index: linux-2.6/fs/buffer.c =================================================================== --- linux-2.6.orig/fs/buffer.c 2007-09-18 15:44:37.000000000 -0700 +++ linux-2.6/fs/buffer.c 2007-09-18 15:44:51.000000000 -0700 @@ -3008,7 +3008,8 @@ void __init buffer_init(void) int nrpages; bh_cachep = KMEM_CACHE(buffer_head, - SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD); + SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD| + SLAB_VFALLBACK); /* * Limit the bh occupancy to 10% of ZONE_NORMAL --