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=-2.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIMWL_WL_MED, 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 618E9C43142 for ; Wed, 27 Jun 2018 19:10:11 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 166ED25D31 for ; Wed, 27 Jun 2018 19:10:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=toxicpanda-com.20150623.gappssmtp.com header.i=@toxicpanda-com.20150623.gappssmtp.com header.b="Ee3iv0A2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 166ED25D31 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=toxicpanda.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966288AbeF0TKI (ORCPT ); Wed, 27 Jun 2018 15:10:08 -0400 Received: from mail-qt0-f196.google.com ([209.85.216.196]:35707 "EHLO mail-qt0-f196.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965269AbeF0TJv (ORCPT ); Wed, 27 Jun 2018 15:09:51 -0400 Received: by mail-qt0-f196.google.com with SMTP id z6-v6so2638818qti.2 for ; Wed, 27 Jun 2018 12:09:51 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=toxicpanda-com.20150623.gappssmtp.com; s=20150623; h=from:to:subject:date:message-id:in-reply-to:references; bh=bxA6cMGXvEe6N+gMDPkoHZMx5A3XRvMVyzrtT6Xehm8=; b=Ee3iv0A2vwt6tjAvoeTSBp/LJm5unNt/ZMaoIK32wUShvaCQpHSIttfuevPkQeusA9 ie9q8bm581Xxy+ppauS1x08gdOFxvJv0MoU+N3WmpKGwwuGq1rf9lRwTUoWawUTF6mcl +tpEdIS4fVD3PPUj9RbIS5v0FIYMf0r4Bsc5dB37UF0qPSBta0MLG1sTGv7jObZ0LVyG o3iw5eQokSmmRIWYjg8+he77Ug5YeJlqw7Rk8lrbnT/PRl4FxWjIkgsvIzztQcWZrdai uPAwnsBWgtX5+vpkiAUOn+yGW/93Aqi1mVK+6ee5IFIr5LXCg67qIvtWtOiLyPOi83OB Zouw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references; bh=bxA6cMGXvEe6N+gMDPkoHZMx5A3XRvMVyzrtT6Xehm8=; b=KpRrBa2BrrGTEcps4xrTcUPBl9TDytmbJC9MxKO2hVJQzZ9z9v96bsluvDRLDqG8he rcPFLtblO0L4ADc55Rbg7GYkA4oPV4DjXkXy7vV9u5UySZBXDSCTqJNbLYrkEeD23Cvf LYUwTpaHwL+JDiFelylKcYFoTpZ3vrqX2Dc/pMEySVLclLIKeKkAdsaDgzXSLzqd0nND deaV6Ifbs+8UfL/Y+r343oczdN/wD0DOBXG6/g3Q6PHb8pAhQd8JSnQ5QnDXIj++8Mud 4zPCC9k5Ezqm6s3uhYse/foZc1hjtyzdGFdIOk2zUOZe97VQZArdZC4d3S0zvrgAE5L2 kFMQ== X-Gm-Message-State: APt69E0wFv2KCTTWDu2cPOW5B8D2TXBW74sDfkMjBx44qEI7zO9HZg6I LmR4Jh0ArEzT+vCUjlT3x/nb4w== X-Google-Smtp-Source: AAOMgpdYkGsTzYHP1GX6ogvZx6Me8KZXfVBbCMty7A+16gKYdUI94DrzUunMxFk0ArNtBSB749JLVw== X-Received: by 2002:a0c:99df:: with SMTP id y31-v6mr6553526qve.156.1530126591041; Wed, 27 Jun 2018 12:09:51 -0700 (PDT) Received: from localhost ([107.15.81.208]) by smtp.gmail.com with ESMTPSA id n21-v6sm4606075qkl.34.2018.06.27.12.09.50 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 27 Jun 2018 12:09:50 -0700 (PDT) From: Josef Bacik To: axboe@kernel.dk, linux-block@vger.kernel.org, kernel-team@fb.com, akpm@linux-foundation.org, hannes@cmpxchg.org, tj@kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 05/14] swap,blkcg: issue swap io with the appropriate context Date: Wed, 27 Jun 2018 15:09:31 -0400 Message-Id: <20180627190940.4696-6-josef@toxicpanda.com> X-Mailer: git-send-email 2.14.3 In-Reply-To: <20180627190940.4696-1-josef@toxicpanda.com> References: <20180627190940.4696-1-josef@toxicpanda.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Tejun Heo For backcharging we need to know who the page belongs to when swapping it out. We don't worry about things that do ->rw_page (zram etc) at the moment, we're only worried about pages that actually go to a block device. Signed-off-by: Tejun Heo Signed-off-by: Josef Bacik Acked-by: Johannes Weiner --- block/bio.c | 24 ++++++++++++++++++++++++ include/linux/bio.h | 7 +++++++ mm/page_io.c | 1 + 3 files changed, 32 insertions(+) diff --git a/block/bio.c b/block/bio.c index 57c4b1986e76..c77fe1b4caa8 100644 --- a/block/bio.c +++ b/block/bio.c @@ -2005,6 +2005,30 @@ EXPORT_SYMBOL(bioset_create); #ifdef CONFIG_BLK_CGROUP +#ifdef CONFIG_MEMCG +/** + * bio_associate_blkcg_from_page - associate a bio with the page's blkcg + * @bio: target bio + * @page: the page to lookup the blkcg from + * + * Associate @bio with the blkcg from @page's owning memcg. This works like + * every other associate function wrt references. + */ +int bio_associate_blkcg_from_page(struct bio *bio, struct page *page) +{ + struct cgroup_subsys_state *blkcg_css; + + if (unlikely(bio->bi_css)) + return -EBUSY; + if (!page->mem_cgroup) + return 0; + blkcg_css = cgroup_get_e_css(page->mem_cgroup->css.cgroup, + &io_cgrp_subsys); + bio->bi_css = blkcg_css; + return 0; +} +#endif /* CONFIG_MEMCG */ + /** * bio_associate_blkcg - associate a bio with the specified blkcg * @bio: target bio diff --git a/include/linux/bio.h b/include/linux/bio.h index f2f3f1428e81..eef1e8877048 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -545,6 +545,13 @@ do { \ #define bio_dev(bio) \ disk_devt((bio)->bi_disk) +#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) +int bio_associate_blkcg_from_page(struct bio *bio, struct page *page); +#else +static inline int bio_associate_blkcg_from_page(struct bio *bio, + struct page *page) { return 0; } +#endif + #ifdef CONFIG_BLK_CGROUP int bio_associate_blkcg(struct bio *bio, struct cgroup_subsys_state *blkcg_css); int bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg); diff --git a/mm/page_io.c b/mm/page_io.c index a552cb37e220..aafd19ec1db4 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -339,6 +339,7 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc, goto out; } bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc); + bio_associate_blkcg_from_page(bio, page); count_swpout_vm_event(page); set_page_writeback(page); unlock_page(page); -- 2.14.3