From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752589AbdHKFRs (ORCPT ); Fri, 11 Aug 2017 01:17:48 -0400 Received: from LGEAMRELO11.lge.com ([156.147.23.51]:49656 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751521AbdHKFRr (ORCPT ); Fri, 11 Aug 2017 01:17:47 -0400 X-Original-SENDERIP: 156.147.1.121 X-Original-MAILFROM: minchan@kernel.org X-Original-SENDERIP: 10.177.220.163 X-Original-MAILFROM: minchan@kernel.org From: Minchan Kim To: Andrew Morton Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org, Ross Zwisler , "karam . lee" , seungho1.park@lge.com, Matthew Wilcox , Christoph Hellwig , Dan Williams , Dave Chinner , jack@suse.cz, Jens Axboe , Vishal Verma , linux-nvdimm@lists.01.org, kernel-team , Minchan Kim Subject: [PATCH v2 0/7] Replace rw_page with on-stack bio Date: Fri, 11 Aug 2017 14:17:20 +0900 Message-Id: <1502428647-28928-1-git-send-email-minchan@kernel.org> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Recently, there was a dicussion about removing rw_page due to maintainance burden[1] but the problem was zram because zram has a clear win for the benchmark at that time. The reason why only zram have a win is due to bio allocation wait time from mempool under extreme memory pressure. Christoph Hellwig suggested we can use on-stack-bio for rw_page devices. This patch implements it and replace rw_page operations with on-stack-bio and then finally, remove rw_page interface completely. This patch is based on linux-next-20170804 [1] http://lkml.kernel.org/r/<20170728165604.10455-1-ross.zwisler@linux.intel.com> * from v1 * Fix trivial mistake * simplify on-stack bio code - Matthew Minchan Kim (7): zram: set BDI_CAP_STABLE_WRITES once bdi: introduce BDI_CAP_SYNCHRONOUS_IO fs: use on-stack-bio if backing device has BDI_CAP_SYNCHRONOUS capability mm:swap: remove end_swap_bio_write argument mm:swap: use on-stack-bio for BDI_CAP_SYNCHRONOUS device zram: remove zram_rw_page fs: remove rw_page drivers/block/brd.c | 2 + drivers/block/zram/zram_drv.c | 68 +++----------------------------- drivers/nvdimm/btt.c | 3 ++ drivers/nvdimm/pmem.c | 2 + fs/block_dev.c | 76 ------------------------------------ fs/mpage.c | 56 ++++++++++++++++++--------- include/linux/backing-dev.h | 8 ++++ include/linux/blkdev.h | 4 -- include/linux/swap.h | 6 +-- mm/page_io.c | 90 ++++++++++++++++++++++++------------------- mm/swapfile.c | 3 ++ mm/zswap.c | 2 +- 12 files changed, 116 insertions(+), 204 deletions(-) -- 2.7.4