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Message-ID: <4390F1C2.7080602@cosmosbay.com>
Date: Sat, 03 Dec 2005 02:15:46 +0100
From: Eric Dumazet <dada1@cosmosbay.com>
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To: Andrew Morton <akpm@osdl.org>
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] remove unused blkp field in percpu_data
References: <121a28810511282317j47a90f6t@mail.gmail.com> <20051129000916.6306da8b.akpm@osdl.org> <438C7218.8030109@cosmosbay.com>
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[PATCH] remove unused blkp field in percpu_data

I found that blkp field was not used in kernel tree.

As most of the times NR_CPUS is a power of two and kmalloc() memory blocks 
too, this extra field basically doubles the memory space allocated in 
__alloc_percpu() to store the 'struct percpu_data'

(for example, if NR_CPUS=8 on i386, kmalloc(4*8+4) returns a 64 bytes block 
instead of a 32 bytes block after this patch)


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

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--- linux-2.6/include/linux/percpu.h	2005-11-29 04:51:27.000000000 +0100
+++ linux-2.6-ed/linux/percpu.h	2005-12-03 01:57:23.000000000 +0100
@@ -19,7 +19,6 @@
 
 struct percpu_data {
 	void *ptrs[NR_CPUS];
-	void *blkp;
 };
 
 /* 

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