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=-9.0 required=3.0 tests=INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 57649C04EBF for ; Tue, 4 Dec 2018 18:36:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 24BA020672 for ; Tue, 4 Dec 2018 18:36:19 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 24BA020672 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-block-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726277AbeLDSgR (ORCPT ); Tue, 4 Dec 2018 13:36:17 -0500 Received: from mail-yw1-f65.google.com ([209.85.161.65]:46512 "EHLO mail-yw1-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726109AbeLDSgP (ORCPT ); Tue, 4 Dec 2018 13:36:15 -0500 Received: by mail-yw1-f65.google.com with SMTP id t13so7377051ywe.13; Tue, 04 Dec 2018 10:36:15 -0800 (PST) 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; bh=hz95MKJyUN7o6BiAIb6U29q8tBi4HHpnn/9TiI2pVhA=; b=M5d9+l66GGqE/+UVAAFURYFgtHHXB0e8XY5JlgDxeKL+82W5Q+M+F/OgLKRHRt5DGH UMrqshNdptVcIxOG6gE0pFVOnr+6ZsG0TIcUaD82JUVmKcboXpvZwApuna7mevIevG9k APg7J/ALMHpJv3N+DPRHT63PLJj+e1wqK6NKfB0NhIWtp1J5ir+MEPwRoFB63Rl4B+Iz f3Mjaeeugvg+aKtd78n7C+gWrU9eoWNE8iccYfC5q11NEBAJb7JzBRe65SEwzdR3t+bP 06TzH9GWYwqhzeL0EM3lzkE1vgBollhj+j7zROFMubdxfpMuocUWg/5dDLQAZC2ZH8Tn TnnQ== X-Gm-Message-State: AA+aEWb72Ml5gN2rrkNSXaiYAfNDULGA/ggjcI0yDd/8WHws83lL5Jo9 ZVJ/O30+Eavq7qXSH5Yemls= X-Google-Smtp-Source: AFSGD/VQTusO3DI5vFE6qYNNs7oTQw+f1ubaA7ooJ3yjyay6KxF7LNK5ZKt5RmC44LkJ8FV36LS0aw== X-Received: by 2002:a81:b703:: with SMTP id v3mr20626551ywh.329.1543948574740; Tue, 04 Dec 2018 10:36:14 -0800 (PST) Received: from dennisz-mbp.thefacebook.com ([199.201.65.135]) by smtp.gmail.com with ESMTPSA id x82sm4274798ywb.34.2018.12.04.10.36.13 (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Tue, 04 Dec 2018 10:36:13 -0800 (PST) From: Dennis Zhou To: Jens Axboe , Tejun Heo , Johannes Weiner , Josef Bacik Cc: kernel-team@fb.com, linux-block@vger.kernel.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Dennis Zhou Subject: [PATCH 08/14] blkcg: associate a blkg for pages being evicted by swap Date: Tue, 4 Dec 2018 13:35:54 -0500 Message-Id: <20181204183600.99746-9-dennis@kernel.org> X-Mailer: git-send-email 2.13.5 In-Reply-To: <20181204183600.99746-1-dennis@kernel.org> References: <20181204183600.99746-1-dennis@kernel.org> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org A prior patch in this series added blkg association to bios issued by cgroups. There are two other paths that we want to attribute work back to the appropriate cgroup: swap and writeback. Here we modify the way swap tags bios to include the blkg. Writeback will be tackle in the next patch. Signed-off-by: Dennis Zhou Reviewed-by: Josef Bacik Acked-by: Tejun Heo --- block/bio.c | 62 +++++++++++++++++++++++++++------------------ include/linux/bio.h | 6 ++--- mm/page_io.c | 2 +- 3 files changed, 42 insertions(+), 28 deletions(-) diff --git a/block/bio.c b/block/bio.c index 90089124b512..f0f069c1823c 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1957,30 +1957,6 @@ EXPORT_SYMBOL(bioset_init_from_src); #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 @@ -2045,6 +2021,44 @@ static void __bio_associate_blkg(struct bio *bio, struct blkcg_gq *blkg) bio->bi_blkg = blkg_try_get_closest(blkg); } +static void __bio_associate_blkg_from_css(struct bio *bio, + struct cgroup_subsys_state *css) +{ + struct blkcg_gq *blkg; + + rcu_read_lock(); + + blkg = blkg_lookup_create(css_to_blkcg(css), bio->bi_disk->queue); + __bio_associate_blkg(bio, blkg); + + rcu_read_unlock(); +} + +#ifdef CONFIG_MEMCG +/** + * bio_associate_blkg_from_page - associate a bio with the page's blkg + * @bio: target bio + * @page: the page to lookup the blkcg from + * + * Associate @bio with the blkg from @page's owning memcg and the respective + * request_queue. This works like every other associate function wrt + * references. + */ +void bio_associate_blkg_from_page(struct bio *bio, struct page *page) +{ + struct cgroup_subsys_state *css; + + if (unlikely(bio->bi_css)) + return; + if (!page->mem_cgroup) + return; + + css = cgroup_get_e_css(page->mem_cgroup->css.cgroup, &io_cgrp_subsys); + bio->bi_css = css; + __bio_associate_blkg_from_css(bio, css); +} +#endif /* CONFIG_MEMCG */ + /** * bio_associate_blkg - associate a bio with a blkg * @bio: target bio diff --git a/include/linux/bio.h b/include/linux/bio.h index 6ee2ea8b378a..f13572c254a7 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -505,10 +505,10 @@ do { \ 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); +void bio_associate_blkg_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; } +static inline void bio_associate_blkg_from_page(struct bio *bio, + struct page *page) { } #endif #ifdef CONFIG_BLK_CGROUP diff --git a/mm/page_io.c b/mm/page_io.c index 5bdfd21c1bd9..3475733b1926 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -339,7 +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); + bio_associate_blkg_from_page(bio, page); count_swpout_vm_event(page); set_page_writeback(page); unlock_page(page); -- 2.17.1