From: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
To: linux-mm <linux-mm@kvack.org>
Subject: [RFC:PATCH 007/012] Avoid page_to_pfn() on tail page
Date: Thu, 24 May 2007 08:12:08 -0400 [thread overview]
Message-ID: <20070524121208.13533.24962.sendpatchset@kleikamp.austin.ibm.com> (raw)
In-Reply-To: <20070524121130.13533.32563.sendpatchset@kleikamp.austin.ibm.com>
Avoid page_to_pfn() on tail page
On ppc64, we don't need bounce buffers to do I/O. This will need more work
for other architectures.
Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
---
block/ll_rw_blk.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff -Nurp linux006/block/ll_rw_blk.c linux007/block/ll_rw_blk.c
--- linux006/block/ll_rw_blk.c 2007-05-21 15:14:57.000000000 -0500
+++ linux007/block/ll_rw_blk.c 2007-05-23 22:53:12.000000000 -0500
@@ -1221,7 +1221,8 @@ void blk_recount_segments(request_queue_
* considered part of another segment, since that might
* change with the bounce page.
*/
- high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
+ high = (!PageFileTail(bv->bv_page) &&
+ page_to_pfn(bv->bv_page) > q->bounce_pfn);
if (high || highprv)
goto new_hw_segment;
if (cluster) {
--
David Kleikamp
IBM Linux Technology Center
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next prev parent reply other threads:[~2007-05-24 12:13 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-24 12:11 [RFC:PATCH 000/012] VM Page Tails Dave Kleikamp
2007-05-24 12:11 ` [RFC:PATCH 001/012] Make iommu_map_sg deal with less-than-page-aligned data Dave Kleikamp
2007-05-24 12:11 ` [RFC:PATCH 002/012] Allow file systems to specify whether to store file tails Dave Kleikamp
2007-05-24 12:11 ` [RFC:PATCH 003/012] Add tail to address space and define PG_pagetail page flag Dave Kleikamp
2007-05-24 12:11 ` [RFC:PATCH 004/012] Replace PAGE_CACHE_SIZE with page_data_size() Dave Kleikamp
2007-05-24 12:11 ` [RFC:PATCH 005/012] Base file tail function Dave Kleikamp
2007-05-24 12:12 ` [RFC:PATCH 006/012] Modify lowmem_page_address() & page_to_phys() to special case tail page Dave Kleikamp
2007-05-24 12:12 ` Dave Kleikamp [this message]
2007-05-24 12:12 ` [RFC:PATCH 008/012] bh_offset needs to take page_address into consideration Dave Kleikamp
2007-05-24 12:12 ` [RFC:PATCH 009/012] Wrap i_size_write Dave Kleikamp
2007-05-24 12:12 ` [RFC:PATCH 010/012] unpack tail page to avoid memory mapping Dave Kleikamp
2007-05-24 12:12 ` [RFC:PATCH 011/012] Make sure tail page is freed correctly Dave Kleikamp
2007-05-24 12:12 ` [RFC:PATCH 012/012] Add tail hooks into file_map.c Dave Kleikamp
2007-05-24 12:45 ` [RFC:PATCH 000/012] VM File Tails Dave Kleikamp
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