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Message-Id: <1227787397.3120.7.camel@castor.localdomain>
Date: Thu, 27 Nov 2008 12:03:17 +0000
From: Richard Kennedy <richard@....demon.co.uk>
To: neilb@...e.de
Cc: lkml <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>
Subject: [PATCH] mm: reorder struct bio to remove padding on 64bit
remove 8 bytes of padding from struct bio which also removes 16 bytes
from struct bio_pair to make it 248 bytes. bio_pair then fits into one
fewer cache lines & into a smaller slab.
Signed-off-by: Richard Kennedy <richard@....demon.co.uk>
---
Hi Neil,
This compiles but hasn't had any testing, as I don't have a raid to test
it on.
patch against 2.6.28-rc6.
regards
Richard
diff --git a/include/linux/bio.h b/include/linux/bio.h
index 6a64209..e6789b2 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -90,10 +90,11 @@ struct bio {
unsigned int bi_comp_cpu; /* completion CPU */
+ atomic_t bi_cnt; /* pin count */
+
struct bio_vec *bi_io_vec; /* the actual vec list */
bio_end_io_t *bi_end_io;
- atomic_t bi_cnt; /* pin count */
void *bi_private;
#if defined(CONFIG_BLK_DEV_INTEGRITY)
--
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