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mm: make generic_writepages() use plugging 

This recovers a performance regression caused by the removal
of the per-device plugging.

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Shaohua Li 2011-03-17 10:47:06 +01:00 committed by Jens Axboe
parent 167400d340
commit 9b6096a65f
1 changed files with 7 additions and 1 deletions
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8
mm/page-writeback.c
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@ -1039,11 +1039,17 @@ static int __writepage(struct page *page, struct writeback_control *wbc,
int generic_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct blk_plug plug;
int ret;
/* deal with chardevs and other special file */
if (!mapping->a_ops->writepage)
return 0;
return write_cache_pages(mapping, wbc, __writepage, mapping);
blk_start_plug(&plug);
ret = write_cache_pages(mapping, wbc, __writepage, mapping);
blk_finish_plug(&plug);
return ret;
}
EXPORT_SYMBOL(generic_writepages);