linux-kernel - [PATCH -mm] lib/rwsem.c: un-inline rwsem_down_failed

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Message-ID: <20060828200416.GA31315@rhlx01.fht-esslingen.de>
Date:	Mon, 28 Aug 2006 22:04:16 +0200
From:	Andreas Mohr <andi@...x01.fht-esslingen.de>
To:	Andrew Morton <akpm@...l.org>
Cc:	dhowells@...hat.com, linux-kernel@...r.kernel.org
Subject: [PATCH -mm] lib/rwsem.c: un-inline rwsem_down_failed_common()

Un-inlining rwsem_down_failed_common() (two callsites) reduced
lib/rwsem.o on my Athlon, gcc 4.1.2 from 5935 to 5480 Bytes (455 Bytes saved).

I thus guess that reduced icache footprint (and better function caching)
is worth more than any function call overhead.

Compile-tested and run-tested on 2.6.18-rc4-mm3.


Signed-off-by: Andreas Mohr <andi@...as.de>

--- linux-2.6.18-rc4-mm3.orig/lib/rwsem.c	2006-08-22 21:09:55.000000000 +0200
+++ linux-2.6.18-rc4-mm3/lib/rwsem.c	2006-09-05 21:52:09.000000000 +0200
@@ -146,7 +146,7 @@
 /*
  * wait for a lock to be granted
  */
-static inline struct rw_semaphore *
+static struct rw_semaphore *
 rwsem_down_failed_common(struct rw_semaphore *sem,
 			struct rwsem_waiter *waiter, signed long adjustment)
 {
-
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