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Message-ID: <4306E345.90102@cosmosbay.com>
Date: Sat, 20 Aug 2005 10:01:09 +0200
From: Eric Dumazet <dada1@cosmosbay.com>
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To: linux-kernel@vger.kernel.org
Subject: [2.6 PATCH] SLAB : removes local_irq_save()/local_irq_restore() pair
 in ksize()
References: <20050819233828.GC3615@stusta.de>
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This patch removes unnecessary critical section in ksize() function, as cli/sti are rather expensive on modern CPUS.


Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>


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diff -Nru linux-2.6.13-rc6-ed/mm/slab.c linux-2.6.13-rc6/mm/slab.c
--- linux-2.6.13-rc6-ed/mm/slab.c	2005-08-20 09:22:29.000000000 +0200
+++ linux-2.6.13-rc6/mm/slab.c	2005-08-20 09:39:42.000000000 +0200
@@ -3080,10 +3080,8 @@
 	unsigned int size = 0;
 
 	if (likely(objp != NULL)) {
-		local_irq_save(flags);
 		c = GET_PAGE_CACHE(virt_to_page(objp));
 		size = kmem_cache_size(c);
-		local_irq_restore(flags);
 	}
 
 	return size;

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