From patchwork Mon Aug 24 15:36:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Schatzberg X-Patchwork-Id: 11733555 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E39A314F6 for ; Mon, 24 Aug 2020 15:40:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C3EE421741 for ; Mon, 24 Aug 2020 15:40:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nnLzC/Tb" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727068AbgHXPjz (ORCPT ); Mon, 24 Aug 2020 11:39:55 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44678 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725921AbgHXPik (ORCPT ); Mon, 24 Aug 2020 11:38:40 -0400 Received: from mail-qt1-x841.google.com (mail-qt1-x841.google.com [IPv6:2607:f8b0:4864:20::841]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7AB2AC061797; Mon, 24 Aug 2020 08:38:05 -0700 (PDT) Received: by mail-qt1-x841.google.com with SMTP id k18so6434062qtm.10; Mon, 24 Aug 2020 08:38:05 -0700 (PDT) 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=/ckAtjHcJOwaVSUeYgTAhDX9DuJ7NFFHp2LflIRMsvo=; b=nnLzC/Tbu8EG4EQLUh1rQ1oWrrSDBUwLwvqXQZkdi3E75Vr9vGDLW8E3ki69yT2+Hr IB/B2nKt/JANUz1txl8ltQ1BkIn7BCW1uV/c5jsaz2yh6gQj6ZSJO4ypr0T10vHhEDle s5P53ZlmeWinIAcJ0Izp3UgG3C7XMkm1Wl9OzT05ADa7VM1sAbJiBS45gdkgovrth1TR hDfS6OzS7OyNhkVEtQW/5oorykjMRWzFz8gQBesKSb2VmJiLh0Z9c1RnyltHXwJCjAsF i/qJJKHIFfsXoEt34WyaptEakC1unEVUyAU+9dB7OmUBPziBzMpDpg5T5Vsi37IaVUHW 5cMg== 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=/ckAtjHcJOwaVSUeYgTAhDX9DuJ7NFFHp2LflIRMsvo=; b=LTWlWF2RowMe0sHgpqlDrHKzDoJs/57z7As5LqEPNFd/insiTfXIRymANrxwFuAodo 0t25Dy53BH6UeGZdtVQv6CrHwN3LegzJA5IK1ROTLGydB/ibIIetCCLdij2oeVkoNDJ2 V1daF25fpVZbXYx2uzsUV6/NPd7YUK4gC6PkQiXZ7OmwqF/yqYry2AhAndgRHa3hAiZ/ clDTMEHs7wyPACuft9u1Gk8KUjuvE/uOmKM795jZhnAWssXQSdYGEXeA8y7OKWY9SHrT 2rICdKMXzl8kv7MinPAczDGoinvci43yucSGqQzfenba/daPJUpViK0WA6mCbq/wl81b BHYA== X-Gm-Message-State: AOAM531s+B2X6TZcSVCYjnc+XmY7TsFOLHV0BQAZ24nUdgRR9bt4PI/d xgSb7F8d1pepfe6KqZHOVR4= X-Google-Smtp-Source: ABdhPJz1Hwbu5Otr/qHLJUXZggCdoNRReRZhCYBmY+Cl8rQhpiWRbW8QX6AqXd8ZPiUxQrknN2wkxg== X-Received: by 2002:ac8:4514:: with SMTP id q20mr5393116qtn.122.1598283484416; Mon, 24 Aug 2020 08:38:04 -0700 (PDT) Received: from dschatzberg-fedora-PC0Y6AEN.thefacebook.com ([2620:10d:c091:480::1:dd21]) by smtp.gmail.com with ESMTPSA id m17sm10942758qkn.45.2020.08.24.08.38.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 24 Aug 2020 08:38:03 -0700 (PDT) From: Dan Schatzberg Cc: Dan Schatzberg , Johannes Weiner , Jens Axboe , Alexander Viro , Jan Kara , Amir Goldstein , Tejun Heo , Li Zefan , Michal Hocko , Vladimir Davydov , Andrew Morton , Hugh Dickins , Shakeel Butt , Roman Gushchin , Chris Down , Yafang Shao , Jakub Kicinski , Yang Shi , Peter Zijlstra , Ingo Molnar , Mathieu Desnoyers , Vlastimil Babka , Daniel Jordan , Thomas Gleixner , Michel Lespinasse , linux-block@vger.kernel.org (open list:BLOCK LAYER), linux-kernel@vger.kernel.org (open list), linux-fsdevel@vger.kernel.org (open list:FILESYSTEMS (VFS and infrastructure)), cgroups@vger.kernel.org (open list:CONTROL GROUP (CGROUP)), linux-mm@kvack.org (open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)) Subject: [PATCH 4/4] loop: Charge i/o to mem and blk cg Date: Mon, 24 Aug 2020 11:36:02 -0400 Message-Id: <20200824153607.6595-5-schatzberg.dan@gmail.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200824153607.6595-1-schatzberg.dan@gmail.com> References: <20200824153607.6595-1-schatzberg.dan@gmail.com> MIME-Version: 1.0 To: unlisted-recipients:; (no To-header on input) Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org The current code only associates with the existing blkcg when aio is used to access the backing file. This patch covers all types of i/o to the backing file and also associates the memcg so if the backing file is on tmpfs, memory is charged appropriately. This patch also exports cgroup_get_e_css so it can be used by the loop module. Signed-off-by: Dan Schatzberg Acked-by: Johannes Weiner --- drivers/block/loop.c | 61 +++++++++++++++++++++++++------------- drivers/block/loop.h | 3 +- include/linux/memcontrol.h | 6 ++++ kernel/cgroup/cgroup.c | 1 + mm/shmem.c | 1 - 5 files changed, 50 insertions(+), 22 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index c8dae53f3914..102d236d1540 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -77,6 +77,7 @@ #include #include #include +#include #include "loop.h" @@ -518,8 +519,6 @@ static void lo_rw_aio_complete(struct kiocb *iocb, long ret, long ret2) { struct loop_cmd *cmd = container_of(iocb, struct loop_cmd, iocb); - if (cmd->css) - css_put(cmd->css); cmd->ret = ret; lo_rw_aio_do_completion(cmd); } @@ -580,8 +579,6 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, cmd->iocb.ki_complete = lo_rw_aio_complete; cmd->iocb.ki_flags = IOCB_DIRECT; cmd->iocb.ki_ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); - if (cmd->css) - kthread_associate_blkcg(cmd->css); if (rw == WRITE) ret = call_write_iter(file, &cmd->iocb, &iter); @@ -589,7 +586,6 @@ static int lo_rw_aio(struct loop_device *lo, struct loop_cmd *cmd, ret = call_read_iter(file, &cmd->iocb, &iter); lo_rw_aio_do_completion(cmd); - kthread_associate_blkcg(NULL); if (ret != -EIOCBQUEUED) cmd->iocb.ki_complete(&cmd->iocb, ret, 0); @@ -929,7 +925,7 @@ struct loop_worker { struct list_head cmd_list; struct list_head idle_list; struct loop_device *lo; - struct cgroup_subsys_state *css; + struct cgroup_subsys_state *blkcg_css; unsigned long last_ran_at; }; @@ -946,7 +942,7 @@ static void loop_queue_work(struct loop_device *lo, struct loop_cmd *cmd) spin_lock_irq(&lo->lo_work_lock); - if (!cmd->css) + if (!cmd->blkcg_css) goto queue_work; node = &lo->worker_tree.rb_node; @@ -954,10 +950,10 @@ static void loop_queue_work(struct loop_device *lo, struct loop_cmd *cmd) while (*node) { parent = *node; cur_worker = container_of(*node, struct loop_worker, rb_node); - if (cur_worker->css == cmd->css) { + if (cur_worker->blkcg_css == cmd->blkcg_css) { worker = cur_worker; break; - } else if ((long)cur_worker->css < (long)cmd->css) { + } else if ((long)cur_worker->blkcg_css < (long)cmd->blkcg_css) { node = &(*node)->rb_left; } else { node = &(*node)->rb_right; @@ -969,13 +965,18 @@ static void loop_queue_work(struct loop_device *lo, struct loop_cmd *cmd) worker = kzalloc(sizeof(struct loop_worker), GFP_NOWAIT | __GFP_NOWARN); /* * In the event we cannot allocate a worker, just queue on the - * rootcg worker + * rootcg worker and issue the I/O as the rootcg */ - if (!worker) + if (!worker) { + cmd->blkcg_css = NULL; + if (cmd->memcg_css) + css_put(cmd->memcg_css); + cmd->memcg_css = NULL; goto queue_work; + } - worker->css = cmd->css; - css_get(worker->css); + worker->blkcg_css = cmd->blkcg_css; + css_get(worker->blkcg_css); INIT_WORK(&worker->work, loop_workfn); INIT_LIST_HEAD(&worker->cmd_list); INIT_LIST_HEAD(&worker->idle_list); @@ -1301,7 +1302,7 @@ static int __loop_clr_fd(struct loop_device *lo, bool release) idle_list) { list_del(&worker->idle_list); rb_erase(&worker->rb_node, &lo->worker_tree); - css_put(worker->css); + css_put(worker->blkcg_css); kfree(worker); } spin_unlock_irq(&lo->lo_work_lock); @@ -2102,13 +2103,18 @@ static blk_status_t loop_queue_rq(struct blk_mq_hw_ctx *hctx, } /* always use the first bio's css */ + cmd->blkcg_css = NULL; + cmd->memcg_css = NULL; #ifdef CONFIG_BLK_CGROUP - if (cmd->use_aio && rq->bio && rq->bio->bi_blkg) { - cmd->css = &bio_blkcg(rq->bio)->css; - css_get(cmd->css); - } else + if (rq->bio && rq->bio->bi_blkg) { + cmd->blkcg_css = &bio_blkcg(rq->bio)->css; +#ifdef CONFIG_MEMCG + cmd->memcg_css = + cgroup_get_e_css(cmd->blkcg_css->cgroup, + &memory_cgrp_subsys); +#endif + } #endif - cmd->css = NULL; loop_queue_work(lo, cmd); return BLK_STS_OK; @@ -2120,13 +2126,28 @@ static void loop_handle_cmd(struct loop_cmd *cmd) const bool write = op_is_write(req_op(rq)); struct loop_device *lo = rq->q->queuedata; int ret = 0; + struct mem_cgroup *old_memcg = NULL; if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) { ret = -EIO; goto failed; } + if (cmd->blkcg_css) + kthread_associate_blkcg(cmd->blkcg_css); + if (cmd->memcg_css) + old_memcg = memalloc_use_memcg( + mem_cgroup_from_css(cmd->memcg_css)); + ret = do_req_filebacked(lo, rq); + + if (cmd->blkcg_css) + kthread_associate_blkcg(NULL); + + if (cmd->memcg_css) { + memalloc_use_memcg(old_memcg); + css_put(cmd->memcg_css); + } failed: /* complete non-aio request */ if (!cmd->use_aio || ret) { @@ -2205,7 +2226,7 @@ static void loop_free_idle_workers(struct timer_list *timer) break; list_del(&worker->idle_list); rb_erase(&worker->rb_node, &lo->worker_tree); - css_put(worker->css); + css_put(worker->blkcg_css); kfree(worker); } if (!list_empty(&lo->idle_worker_list)) diff --git a/drivers/block/loop.h b/drivers/block/loop.h index 0162b55a68e1..4d6886d9855a 100644 --- a/drivers/block/loop.h +++ b/drivers/block/loop.h @@ -75,7 +75,8 @@ struct loop_cmd { long ret; struct kiocb iocb; struct bio_vec *bvec; - struct cgroup_subsys_state *css; + struct cgroup_subsys_state *blkcg_css; + struct cgroup_subsys_state *memcg_css; }; /* Support for loadable transfer modules */ diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index d0b036123c6a..fceac9f66d96 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -1031,6 +1031,12 @@ static inline struct mem_cgroup *get_mem_cgroup_from_page(struct page *page) return NULL; } +static inline +struct mem_cgroup *mem_cgroup_from_css(struct cgroup_subsys_state *css) +{ + return NULL; +} + static inline void mem_cgroup_put(struct mem_cgroup *memcg) { } diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index dd247747ec14..16d059a89a68 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -580,6 +580,7 @@ struct cgroup_subsys_state *cgroup_get_e_css(struct cgroup *cgrp, rcu_read_unlock(); return css; } +EXPORT_SYMBOL_GPL(cgroup_get_e_css); static void cgroup_get_live(struct cgroup *cgrp) { diff --git a/mm/shmem.c b/mm/shmem.c index 77c908730be4..1139f52ac4ee 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1696,7 +1696,6 @@ static int shmem_swapin_page(struct inode *inode, pgoff_t index, struct address_space *mapping = inode->i_mapping; struct shmem_inode_info *info = SHMEM_I(inode); struct mm_struct *charge_mm = vma ? vma->vm_mm : NULL; - struct mem_cgroup *memcg; struct page *page; swp_entry_t swap; int error;