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=-15.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 9B26EC433DB for ; Sat, 2 Jan 2021 15:22:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 70A3922482 for ; Sat, 2 Jan 2021 15:22:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726775AbhABPWL (ORCPT ); Sat, 2 Jan 2021 10:22:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726766AbhABPWK (ORCPT ); Sat, 2 Jan 2021 10:22:10 -0500 Received: from mail-wr1-x431.google.com (mail-wr1-x431.google.com [IPv6:2a00:1450:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C29F1C0613ED; Sat, 2 Jan 2021 07:21:27 -0800 (PST) Received: by mail-wr1-x431.google.com with SMTP id 91so26566410wrj.7; Sat, 02 Jan 2021 07:21:27 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=7FOerU/+uiaLOx8IjnYNL5LXRoiyAnmqji55A4AV5Zs=; b=LBsSYTbjwdI3QmQu4IbgQ7olNGDMBAqElqxAyPsojxLe7NcTh8El+Pke0BmUM22eYb AuZq9SBpNP53WKEFTQdHVDQPCC/8PDYsWLnhkSG7Q2av8EAE8APyACuUnwA3w3t7JqWh R4mCXlk4y9W+n2bx+NU4V6SqSobRuYDWexgtwJuMlhnrLQQMDddC3lR9NTJlDYGo4U1G Yntmje7tslRu50v12yeP/tlquNu8wXFd0g77n+FLG0DNgXfWPtBPtB8SMzz/3+rhpWhR Epwmsr+CSoG9EWj2xUflykAOxhsPhi2ABMO72oHO7eo5cj09XjFAKrK+DFY/UA4J8N0y OWaQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=7FOerU/+uiaLOx8IjnYNL5LXRoiyAnmqji55A4AV5Zs=; b=H54ehalIm4pDyQ20WUtcI4FW9hSb/7osqZR9HBk+rzMD32OM0cWqAMMMZMfZA57Cf3 vQi8Sj5yv6SHhQS95nr2OUK1mjnpOtKZUG8PVsCw6PAvEy4fiUmny0scjRb6fl4SZsZy o4b40qV+ruSi90OC0jZjPHrZI6g1T/dgX2Ugeb1HBzf4S7IUbhnmDMNmF/PFl5yVX7xm 4IclwqlzPwjK8Jg3lMyiNZjYTz12SBI0ZyCg2AAfZz7YYJAWa6rkZfXxuPDihImJn4Nu Gq7GXbvd2PkE5TkzKNekGWANcuToq2oH/VBogzBNfn+XvvXfUT84qfH/bendRWDaRiUF /zew== X-Gm-Message-State: AOAM532vVaNBSbbz8b10LLhrk1DTnnHmFPlkojsPahgQLncNsDl1DcF0 +NvOfaLIqM84eM+Qv+AfvBJCAsRBSy/3UQ== X-Google-Smtp-Source: ABdhPJzvzXyfPCTdTGrqpyWR+n7zH7gi0rGiGb6+ilO2BRa7Nk9Cv57P3HckjnOAEWjCCb1q8AjWLg== X-Received: by 2002:a5d:6789:: with SMTP id v9mr71303602wru.86.1609600886321; Sat, 02 Jan 2021 07:21:26 -0800 (PST) Received: from localhost.localdomain ([85.255.236.0]) by smtp.gmail.com with ESMTPSA id h13sm78671243wrm.28.2021.01.02.07.21.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Jan 2021 07:21:25 -0800 (PST) From: Pavel Begunkov To: linux-block@vger.kernel.org Cc: Jens Axboe , Christoph Hellwig , Matthew Wilcox , Ming Lei , Johannes Weiner , Alexander Viro , "Darrick J . Wong" , "Martin K . Petersen" , Jonathan Corbet , linux-xfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, io-uring@vger.kernel.org, linux-kernel@vger.kernel.org, target-devel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-doc@vger.kernel.org Subject: [PATCH v2 3/7] block/psi: remove PSI annotations from direct IO Date: Sat, 2 Jan 2021 15:17:35 +0000 Message-Id: X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Direct IO does not operate on the current working set of pages managed by the kernel, so it should not be accounted as memory stall to PSI infrastructure. The block layer and iomap direct IO use bio_iov_iter_get_pages() to build bios, and they are the only users of it, so to avoid PSI tracking for them clear out BIO_WORKINGSET flag. Do same for dio_bio_submit() because fs/direct_io constructs bios by hand directly calling bio_add_page(). Reported-by: Christoph Hellwig Suggested-by: Christoph Hellwig Suggested-by: Johannes Weiner Signed-off-by: Pavel Begunkov --- block/bio.c | 6 ++++++ fs/direct-io.c | 2 ++ 2 files changed, 8 insertions(+) diff --git a/block/bio.c b/block/bio.c index 1f2cc1fbe283..9f26984af643 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1099,6 +1099,9 @@ static int __bio_iov_append_get_pages(struct bio *bio, struct iov_iter *iter) * fit into the bio, or are requested in @iter, whatever is smaller. If * MM encounters an error pinning the requested pages, it stops. Error * is returned only if 0 pages could be pinned. + * + * It's intended for direct IO, so doesn't do PSI tracking, the caller is + * responsible for setting BIO_WORKINGSET if necessary. */ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) { @@ -1123,6 +1126,9 @@ int bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) if (is_bvec) bio_set_flag(bio, BIO_NO_PAGE_REF); + + /* don't account direct I/O as memory stall */ + bio_clear_flag(bio, BIO_WORKINGSET); return bio->bi_vcnt ? 0 : ret; } EXPORT_SYMBOL_GPL(bio_iov_iter_get_pages); diff --git a/fs/direct-io.c b/fs/direct-io.c index d53fa92a1ab6..0e689233f2c7 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -426,6 +426,8 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio) unsigned long flags; bio->bi_private = dio; + /* don't account direct I/O as memory stall */ + bio_clear_flag(bio, BIO_WORKINGSET); spin_lock_irqsave(&dio->bio_lock, flags); dio->refcount++; -- 2.24.0