From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wu Fengguang Subject: [PATCH 5/5] vmscan: transfer async file writeback to the flusher Date: Thu, 29 Jul 2010 19:51:47 +0800 Message-ID: <20100729121423.754455334@intel.com> References: <20100729115142.102255590@intel.com> Cc: Wu Fengguang , LKML To: Andrew Morton Return-path: cc: "linux-fsdevel@vger.kernel.org" cc: "linux-mm@kvack.org" cc: Dave Chinner cc: Chris Mason , Nick Piggin cc: Rik van Riel cc: Johannes Weiner cc: Christoph Hellwig cc: KAMEZAWA Hiroyuki cc: KOSAKI Motohiro cc: Andrea Arcangeli , Mel Gorman cc: Minchan Kim Content-Disposition: inline; filename=vmscan-writeback-inode-page.patch Sender: owner-linux-mm@kvack.org List-Id: linux-fsdevel.vger.kernel.org This relays all ASYNC file writeback IOs to the flusher threads. The lesser SYNC pageout()s will work as before (as a last resort). It's a minimal prototype implementation and barely runs without panic. It potentially requires lots of more work to go stable. Signed-off-by: Wu Fengguang --- mm/vmscan.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) --- linux-next.orig/mm/vmscan.c 2010-07-29 17:07:07.000000000 +0800 +++ linux-next/mm/vmscan.c 2010-07-29 17:09:16.000000000 +0800 @@ -379,6 +379,13 @@ static pageout_t pageout(struct page *pa } if (mapping->a_ops->writepage == NULL) return PAGE_ACTIVATE; + + if (sync_writeback == PAGEOUT_IO_ASYNC && + page_is_file_cache(page)) { + bdi_start_inode_writeback(mapping->host, page->index); + return PAGE_KEEP; + } + if (!may_write_to_queue(mapping->backing_dev_info)) return PAGE_KEEP; @@ -1366,7 +1373,6 @@ shrink_inactive_list(unsigned long nr_to list_add(&page->lru, &putback_list); } - wakeup_flusher_threads(laptop_mode ? 0 : nr_dirty); congestion_wait(BLK_RW_ASYNC, HZ/10); /* -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org