From 9b6096a65f99a89dfd8328c4e469e7b53b3ae04a Mon Sep 17 00:00:00 2001 From: Shaohua Li Date: Thu, 17 Mar 2011 10:47:06 +0100 Subject: [PATCH] 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 --- mm/page-writeback.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/page-writeback.c b/mm/page-writeback.c index cc0ede169e41..24b7ac2bc36b 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -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);