From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chao Yu Subject: [PATCH] f2fs: stop issuing discard immediately if there is queued IO Date: Sun, 8 Jul 2018 22:08:09 +0800 Message-ID: <20180708140809.23571-1-chao@kernel.org> Return-path: Sender: linux-kernel-owner@vger.kernel.org To: jaegeuk@kernel.org Cc: linux-f2fs-devel@lists.sourceforge.net, linux-kernel@vger.kernel.org, Chao Yu List-Id: linux-f2fs-devel.lists.sourceforge.net From: Chao Yu For background discard policy, even if there is queued user IO, still we will check max_requests times for next discard entry, it is unneeded, let's just stop this round submission immediately. Signed-off-by: Chao Yu --- fs/f2fs/segment.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 99beaf0a2dea..aee198869b1f 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -1190,7 +1190,7 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, struct list_head *pend_list; struct discard_cmd *dc, *tmp; struct blk_plug plug; - int i, iter = 0, issued = 0; + int i, issued = 0; bool io_interrupted = false; for (i = MAX_PLIST_NUM - 1; i >= 0; i--) { @@ -1211,20 +1211,19 @@ static int __issue_discard_cmd(struct f2fs_sb_info *sbi, if (dpolicy->io_aware && i < dpolicy->io_aware_gran && !is_idle(sbi)) { io_interrupted = true; - goto skip; + break; } __submit_discard_cmd(sbi, dpolicy, dc); - issued++; -skip: - if (++iter >= dpolicy->max_requests) + + if (++issued >= dpolicy->max_requests) break; } blk_finish_plug(&plug); next: mutex_unlock(&dcc->cmd_lock); - if (iter >= dpolicy->max_requests) + if (issued >= dpolicy->max_requests || io_interrupted) break; } -- 2.16.2.17.g38e79b1fd