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Thu, 28 May 2020 06:55:33 -0700 (PDT) From: Dan Schatzberg To: 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 , Roman Gushchin , Shakeel Butt , Chris Down , Yang Shi , Thomas Gleixner , "Peter Zijlstra (Intel)" , Ingo Molnar , Mathieu Desnoyers , Andrea Arcangeli , 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: Thu, 28 May 2020 09:54:39 -0400 Message-Id: <20200528135444.11508-5-schatzberg.dan@gmail.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200528135444.11508-1-schatzberg.dan@gmail.com> References: <20200528135444.11508-1-schatzberg.dan@gmail.com> MIME-Version: 1.0 X-Rspamd-Queue-Id: 72192100615BB X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam05 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 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 + 4 files changed, 50 insertions(+), 21 deletions(-) diff --git a/drivers/block/loop.c b/drivers/block/loop.c index 378a68e5ccf3..c238e274788e 100644 --- a/drivers/block/loop.c +++ b/drivers/block/loop.c @@ -77,6 +77,7 @@ #include #include #include +#include =20 #include "loop.h" =20 @@ -507,8 +508,6 @@ static void lo_rw_aio_complete(struct kiocb *iocb, lo= ng ret, long ret2) { struct loop_cmd *cmd =3D container_of(iocb, struct loop_cmd, iocb); =20 - if (cmd->css) - css_put(cmd->css); cmd->ret =3D ret; lo_rw_aio_do_completion(cmd); } @@ -569,8 +568,6 @@ static int lo_rw_aio(struct loop_device *lo, struct l= oop_cmd *cmd, cmd->iocb.ki_complete =3D lo_rw_aio_complete; cmd->iocb.ki_flags =3D IOCB_DIRECT; cmd->iocb.ki_ioprio =3D IOPRIO_PRIO_VALUE(IOPRIO_CLASS_NONE, 0); - if (cmd->css) - kthread_associate_blkcg(cmd->css); =20 if (rw =3D=3D WRITE) ret =3D call_write_iter(file, &cmd->iocb, &iter); @@ -578,7 +575,6 @@ static int lo_rw_aio(struct loop_device *lo, struct l= oop_cmd *cmd, ret =3D call_read_iter(file, &cmd->iocb, &iter); =20 lo_rw_aio_do_completion(cmd); - kthread_associate_blkcg(NULL); =20 if (ret !=3D -EIOCBQUEUED) cmd->iocb.ki_complete(&cmd->iocb, ret, 0); @@ -918,7 +914,7 @@ 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; }; =20 @@ -935,7 +931,7 @@ static void loop_queue_work(struct loop_device *lo, s= truct loop_cmd *cmd) =20 spin_lock_irq(&lo->lo_work_lock); =20 - if (!cmd->css) + if (!cmd->blkcg_css) goto queue_work; =20 node =3D &lo->worker_tree.rb_node; @@ -943,10 +939,10 @@ static void loop_queue_work(struct loop_device *lo,= struct loop_cmd *cmd) while (*node) { parent =3D *node; cur_worker =3D container_of(*node, struct loop_worker, rb_node); - if (cur_worker->css =3D=3D cmd->css) { + if (cur_worker->blkcg_css =3D=3D cmd->blkcg_css) { worker =3D cur_worker; break; - } else if ((long)cur_worker->css < (long)cmd->css) { + } else if ((long)cur_worker->blkcg_css < (long)cmd->blkcg_css) { node =3D &(*node)->rb_left; } else { node =3D &(*node)->rb_right; @@ -958,13 +954,18 @@ static void loop_queue_work(struct loop_device *lo,= struct loop_cmd *cmd) worker =3D kzalloc(sizeof(struct loop_worker), GFP_NOWAIT | __GFP_NOWAR= N); /* * 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 =3D NULL; + if (cmd->memcg_css) + css_put(cmd->memcg_css); + cmd->memcg_css =3D NULL; goto queue_work; + } =20 - worker->css =3D cmd->css; - css_get(worker->css); + worker->blkcg_css =3D 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); @@ -1214,7 +1215,7 @@ static int __loop_clr_fd(struct loop_device *lo, bo= ol 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); @@ -2027,13 +2028,18 @@ static blk_status_t loop_queue_rq(struct blk_mq_h= w_ctx *hctx, } =20 /* always use the first bio's css */ + cmd->blkcg_css =3D NULL; + cmd->memcg_css =3D NULL; #ifdef CONFIG_BLK_CGROUP - if (cmd->use_aio && rq->bio && rq->bio->bi_blkg) { - cmd->css =3D &bio_blkcg(rq->bio)->css; - css_get(cmd->css); - } else + if (rq->bio && rq->bio->bi_blkg) { + cmd->blkcg_css =3D &bio_blkcg(rq->bio)->css; +#ifdef CONFIG_MEMCG + cmd->memcg_css =3D + cgroup_get_e_css(cmd->blkcg_css->cgroup, + &memory_cgrp_subsys); +#endif + } #endif - cmd->css =3D NULL; loop_queue_work(lo, cmd); =20 return BLK_STS_OK; @@ -2045,13 +2051,28 @@ static void loop_handle_cmd(struct loop_cmd *cmd) const bool write =3D op_is_write(req_op(rq)); struct loop_device *lo =3D rq->q->queuedata; int ret =3D 0; + struct mem_cgroup *old_memcg =3D NULL; =20 if (write && (lo->lo_flags & LO_FLAGS_READ_ONLY)) { ret =3D -EIO; goto failed; } =20 + if (cmd->blkcg_css) + kthread_associate_blkcg(cmd->blkcg_css); + if (cmd->memcg_css) + old_memcg =3D memalloc_use_memcg( + mem_cgroup_from_css(cmd->memcg_css)); + ret =3D 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) { @@ -2129,7 +2150,7 @@ static void loop_free_idle_workers(struct timer_lis= t *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; }; =20 /* Support for loadable transfer modules */ diff --git a/include/linux/memcontrol.h b/include/linux/memcontrol.h index 977edd3b7bd8..67a98db5be9e 100644 --- a/include/linux/memcontrol.h +++ b/include/linux/memcontrol.h @@ -925,6 +925,12 @@ static inline struct mem_cgroup *get_mem_cgroup_from= _page(struct page *page) return NULL; } =20 +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 06b5ea9d899d..a3c64d961d68 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -587,6 +587,7 @@ struct cgroup_subsys_state *cgroup_get_e_css(struct c= group *cgrp, rcu_read_unlock(); return css; } +EXPORT_SYMBOL_GPL(cgroup_get_e_css); =20 static void cgroup_get_live(struct cgroup *cgrp) { --=20 2.24.1