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[82.132.231.234]) by smtp.gmail.com with ESMTPSA id d7-20020adffbc7000000b002d5a8d8442asm28727962wrs.37.2023.03.30.07.54.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 30 Mar 2023 07:54:44 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com, linux-kernel@vger.kernel.org Subject: [PATCH 09/11] io_uring/rsrc: don't offload node free Date: Thu, 30 Mar 2023 15:53:27 +0100 Message-Id: <8083bdb49f57a968104137f1f256af8a5d46da64.1680187408.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.39.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org struct delayed_work rsrc_put_work was previously used to offload node freeing because io_rsrc_node_ref_zero() was previously called by RCU in the IRQ context. Now, as percpu refcounting is gone, we can do it eagerly at the spot without pushing it to a worker. Signed-off-by: Pavel Begunkov --- include/linux/io_uring_types.h | 3 -- io_uring/io_uring.c | 6 ---- io_uring/rsrc.c | 59 +++------------------------------- 3 files changed, 4 insertions(+), 64 deletions(-) diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h index 9492889f00c0..47496059e13a 100644 --- a/include/linux/io_uring_types.h +++ b/include/linux/io_uring_types.h @@ -330,9 +330,6 @@ struct io_ring_ctx { struct io_rsrc_data *file_data; struct io_rsrc_data *buf_data; - struct delayed_work rsrc_put_work; - struct callback_head rsrc_put_tw; - struct llist_head rsrc_put_llist; /* protected by ->uring_lock */ struct list_head rsrc_ref_list; diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index e94780c0a024..8c3886a4ca96 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -326,9 +326,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) INIT_LIST_HEAD(&ctx->timeout_list); INIT_LIST_HEAD(&ctx->ltimeout_list); INIT_LIST_HEAD(&ctx->rsrc_ref_list); - INIT_DELAYED_WORK(&ctx->rsrc_put_work, io_rsrc_put_work); - init_task_work(&ctx->rsrc_put_tw, io_rsrc_put_tw); - init_llist_head(&ctx->rsrc_put_llist); init_llist_head(&ctx->work_llist); INIT_LIST_HEAD(&ctx->tctx_list); ctx->submit_state.free_list.next = NULL; @@ -2822,11 +2819,8 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) io_rsrc_node_destroy(ctx->rsrc_node); if (ctx->rsrc_backup_node) io_rsrc_node_destroy(ctx->rsrc_backup_node); - flush_delayed_work(&ctx->rsrc_put_work); - flush_delayed_work(&ctx->fallback_work); WARN_ON_ONCE(!list_empty(&ctx->rsrc_ref_list)); - WARN_ON_ONCE(!llist_empty(&ctx->rsrc_put_llist)); #if defined(CONFIG_UNIX) if (ctx->ring_sock) { diff --git a/io_uring/rsrc.c b/io_uring/rsrc.c index 95e71300bb35..0f4e245dee1b 100644 --- a/io_uring/rsrc.c +++ b/io_uring/rsrc.c @@ -145,15 +145,8 @@ static void io_rsrc_put_work_one(struct io_rsrc_data *rsrc_data, { struct io_ring_ctx *ctx = rsrc_data->ctx; - if (prsrc->tag) { - if (ctx->flags & IORING_SETUP_IOPOLL) { - mutex_lock(&ctx->uring_lock); - io_post_aux_cqe(ctx, prsrc->tag, 0, 0); - mutex_unlock(&ctx->uring_lock); - } else { - io_post_aux_cqe(ctx, prsrc->tag, 0, 0); - } - } + if (prsrc->tag) + io_post_aux_cqe(ctx, prsrc->tag, 0, 0); rsrc_data->do_put(ctx, prsrc); } @@ -176,32 +169,6 @@ static void __io_rsrc_put_work(struct io_rsrc_node *ref_node) complete(&rsrc_data->done); } -void io_rsrc_put_work(struct work_struct *work) -{ - struct io_ring_ctx *ctx; - struct llist_node *node; - - ctx = container_of(work, struct io_ring_ctx, rsrc_put_work.work); - node = llist_del_all(&ctx->rsrc_put_llist); - - while (node) { - struct io_rsrc_node *ref_node; - struct llist_node *next = node->next; - - ref_node = llist_entry(node, struct io_rsrc_node, llist); - __io_rsrc_put_work(ref_node); - node = next; - } -} - -void io_rsrc_put_tw(struct callback_head *cb) -{ - struct io_ring_ctx *ctx = container_of(cb, struct io_ring_ctx, - rsrc_put_tw); - - io_rsrc_put_work(&ctx->rsrc_put_work.work); -} - void io_wait_rsrc_data(struct io_rsrc_data *data) { if (data && !atomic_dec_and_test(&data->refs)) @@ -217,34 +184,18 @@ void io_rsrc_node_ref_zero(struct io_rsrc_node *node) __must_hold(&node->rsrc_data->ctx->uring_lock) { struct io_ring_ctx *ctx = node->rsrc_data->ctx; - bool first_add = false; - unsigned long delay = HZ; node->done = true; - - /* if we are mid-quiesce then do not delay */ - if (node->rsrc_data->quiesce) - delay = 0; - while (!list_empty(&ctx->rsrc_ref_list)) { node = list_first_entry(&ctx->rsrc_ref_list, struct io_rsrc_node, node); /* recycle ref nodes in order */ if (!node->done) break; - list_del(&node->node); - first_add |= llist_add(&node->llist, &ctx->rsrc_put_llist); - } - if (!first_add) - return; - - if (ctx->submitter_task) { - if (!task_work_add(ctx->submitter_task, &ctx->rsrc_put_tw, - ctx->notify_method)) - return; + list_del(&node->node); + __io_rsrc_put_work(node); } - mod_delayed_work(system_wq, &ctx->rsrc_put_work, delay); } static struct io_rsrc_node *io_rsrc_node_alloc(void) @@ -320,13 +271,11 @@ __cold static int io_rsrc_ref_quiesce(struct io_rsrc_data *data, if (ret < 0) { atomic_inc(&data->refs); /* wait for all works potentially completing data->done */ - flush_delayed_work(&ctx->rsrc_put_work); reinit_completion(&data->done); mutex_lock(&ctx->uring_lock); break; } - flush_delayed_work(&ctx->rsrc_put_work); ret = wait_for_completion_interruptible(&data->done); if (!ret) { mutex_lock(&ctx->uring_lock); -- 2.39.1