From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 242DDC76196 for ; Fri, 19 Jul 2019 04:00:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EAEC021850 for ; Fri, 19 Jul 2019 04:00:21 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563508822; bh=LQdY3nh7+3V5/CjhVYbG4HiDks5DVAZNmWucKy8b1j8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=HwhFuzQ35XS9XeJJeapWPQaGXNhdIhVtI2mfkkqYKxEdhQnzlchPEIF/WAUMhpwV2 8MzbFkeiDwVtKop96xyhfsFEYaTYekIN+rGU7C9bnhns5/6siK1y4x3N3nIfyNoi7Q 2iHPSuIXY7lyA2+F4EkeDIohn6wxbhbo+K9e4/Ko= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727322AbfGSEAU (ORCPT ); Fri, 19 Jul 2019 00:00:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:60110 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727577AbfGSEAN (ORCPT ); Fri, 19 Jul 2019 00:00:13 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id EF48321852; Fri, 19 Jul 2019 04:00:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1563508812; bh=LQdY3nh7+3V5/CjhVYbG4HiDks5DVAZNmWucKy8b1j8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=B/aHluIowNUs7Ap4i2FNEsqdAHCAbg30lq0Nfw9O/G1zqLiZEILZnQ++EoAcauL57 bg2nqdHjiHzqB0pdJNQXVDAwrT2azkWOPAuV+RDohFQp0QxjXk3wa9DD7Q90V0HRgh C8ZMf+Muleic1ikDAjOVUlRcENQ3bOlqEJfw5cbU= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Sahitya Tummala , Chao Yu , Jaegeuk Kim , Sasha Levin , linux-f2fs-devel@lists.sourceforge.net Subject: [PATCH AUTOSEL 5.2 104/171] f2fs: fix is_idle() check for discard type Date: Thu, 18 Jul 2019 23:55:35 -0400 Message-Id: <20190719035643.14300-104-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190719035643.14300-1-sashal@kernel.org> References: <20190719035643.14300-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Sahitya Tummala [ Upstream commit 56659ce838456c6f2315ce8a4bd686ac4b23e9d1 ] The discard thread should issue upto dpolicy->max_requests at once and wait for all those discard requests at once it reaches dpolicy->max_requests. It should then sleep for dpolicy->min_interval timeout before issuing the next batch of discard requests. But in the current code of is_idle(), it checks for dcc_info->queued_discard and aborts issuing the discard batch of max_requests. This dcc_info->queued_discard will be true always once one discard command is issued. It is thus resulting into this type of discard request pattern - - Issue discard request#1 - is_idle() returns false, discard thread waits for request#1 and then sleeps for min_interval 50ms. - Issue discard request#2 - is_idle() returns false, discard thread waits for request#2 and then sleeps for min_interval 50ms. - and so on for all other discard requests, assuming f2fs is idle w.r.t other conditions. With this fix, the pattern will look like this - - Issue discard request#1 - Issue discard request#2 and so on upto max_requests of 8 - Issue discard request#8 - wait for min_interval 50ms. Signed-off-by: Sahitya Tummala Reviewed-by: Chao Yu Signed-off-by: Jaegeuk Kim Signed-off-by: Sasha Levin --- fs/f2fs/f2fs.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h index 9e6721e15b24..cbdc2f88a98c 100644 --- a/fs/f2fs/f2fs.h +++ b/fs/f2fs/f2fs.h @@ -2204,7 +2204,7 @@ static inline bool is_idle(struct f2fs_sb_info *sbi, int type) get_pages(sbi, F2FS_DIO_WRITE)) return false; - if (SM_I(sbi) && SM_I(sbi)->dcc_info && + if (type != DISCARD_TIME && SM_I(sbi) && SM_I(sbi)->dcc_info && atomic_read(&SM_I(sbi)->dcc_info->queued_discard)) return false; -- 2.20.1