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[16/17] Allow virtual fallback for buffer_heads

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From: Christoph Lameter <clameter@...>
To: <unlisted-recipients@...>, <@...>
Cc: <linux-fsdevel@...>, <linux-kernel@...>
Subject: [16/17] Allow virtual fallback for buffer_heads
Date: Tuesday, September 25, 2007 - 7:42 pm

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 <clameter@sgi.com>

---
 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

-- 
-
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[16/17] Allow virtual fallback for buffer_heads, Christoph Lameter, (Tue Sep 25, 7:42 pm)