linux-kernel - [PATCH] lguest: use ioremap

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Message-Id: <200805170038.35282.rusty@rustcorp.com.au>
Date:	Sat, 17 May 2008 00:38:35 +1000
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, lguest <lguest@...abs.org>
Subject: [PATCH] lguest: use ioremap_cache, not ioremap

Thanks to Jon Corbet & LWN.  Only took me a day to join the dots.

Host->Guest netcat before (with unnecessily large receive buffers):
1073741824 bytes (1.1 GB) copied, 24.7528 seconds, 43.4 MB/s

After:
1073741824 bytes (1.1 GB) copied, 17.6369 seconds, 60.9 MB/s

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
---
 drivers/lguest/lguest_device.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -r f0417cb4869e drivers/lguest/lguest_device.c
--- a/drivers/lguest/lguest_device.c	Fri May 16 15:51:08 2008 +1000
+++ b/drivers/lguest/lguest_device.c	Fri May 16 20:43:36 2008 +1000
@@ -27,7 +27,7 @@ static unsigned int dev_index;
  * __iomem to quieten sparse. */
 static inline void *lguest_map(unsigned long phys_addr, unsigned long pages)
 {
-	return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages);
+	return (__force void *)ioremap_cache(phys_addr, PAGE_SIZE*pages);
 }
 
 static inline void lguest_unmap(void *addr)
--
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