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Commit 9b6096a6 authored by Shaohua Li's avatar Shaohua Li Committed by Jens Axboe
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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: default avatarJens Axboe <jaxboe@fusionio.com>
parent 167400d3

mm/page-writeback.c

+7 −1
Original line number Diff line number Diff line
@@ -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);