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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id F0707C43334 for ; Tue, 14 Jun 2022 12:34:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356534AbiFNMel (ORCPT ); Tue, 14 Jun 2022 08:34:41 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33352 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S245682AbiFNMe1 (ORCPT ); Tue, 14 Jun 2022 08:34:27 -0400 Received: from mail-wm1-x32a.google.com (mail-wm1-x32a.google.com [IPv6:2a00:1450:4864:20::32a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2678647569 for ; Tue, 14 Jun 2022 05:31:07 -0700 (PDT) Received: by mail-wm1-x32a.google.com with SMTP id i17-20020a7bc951000000b0039c4760ec3fso835953wml.0 for ; Tue, 14 Jun 2022 05:31:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=4yIX3gVkG6/uT9LgOTEi4hy6UN+9Z2Jm3ZZftf3P9LE=; b=EUEp4I6zysGh3HKV/yU/NMXoI/J5mnVoMPshnzcRU6kglCYT8ogf7x4mLl2FLHqnja 3KtTNT8N6CH4GwnONnWOQq5EYO0IPtPTMn9c1jEOCWw+uuHRKPOX1edPbhspeMgjQnRp Qem5AIjpiC0zDhkSUk2jAMqEjLAyBgsLalkLni9xHm+zIXc9f6BujWyEY0pihFrS66Qc BRGuIWRDcXuFSkpCnTxNWYrf9kiNzoy3mZanhFbwcrQ/kxh4jQIgmQAoD0PVqGPl/h7Y QqcR5Kl+jYtRi7QdiqtrgSNYDI0Hnq+5AUX1IC4qsBrGZwwf8aqUL6itIURPn++aBCWy fRjA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=4yIX3gVkG6/uT9LgOTEi4hy6UN+9Z2Jm3ZZftf3P9LE=; b=kr4CjJKRKSlyZXkwGOWWl/mupAO7dct/0ITZ+MZ7z/5B1agqXI0rFMoo7ZllFvdBeI EBR61TWrDLkk1lk1xxBX7JHICUcpTwx+Ax2FnsR4VqcBvkZYufT2kxd6bR549mGOZu4E HDhEqjUlbkesqyZJHLTpr7ZjGaN9gazcJg/bmgCUOl01EqbX2DtaiARXOxedErlcTjMz 3jF+wJUvv10V/PqBAkUhWjsbVmecwEBDpJUUN1Kf8lIVy49O9ZXnsBTLS3Mmlo611l9g ObRd6cp8Dnp4IZNU5l/6eTIDqUmxPHH2UpzUTIuyGBaVerfV9V4i1eiOrvSlPJjNQOpu WX6A== X-Gm-Message-State: AOAM533imeGgE4uSSMb/4l9lceVckwiLWh7HcANNoz3c4dH9gpjdUmXE U6jXsFd1an7yyq3FO6DW3dm8dw+I+DqBuQ== X-Google-Smtp-Source: ABdhPJypoaHFONLPmF/fTnI7La52VETRFWoJPRz3VXXtMvblgjCctzBHZ8ASiVtzg1bnfMhGY2Sf8Q== X-Received: by 2002:a7b:c3d1:0:b0:39c:64d0:b8c2 with SMTP id t17-20020a7bc3d1000000b0039c64d0b8c2mr3971358wmj.195.1655209866143; Tue, 14 Jun 2022 05:31:06 -0700 (PDT) Received: from 127.0.0.1localhost (188.28.125.106.threembb.co.uk. [188.28.125.106]) by smtp.gmail.com with ESMTPSA id t7-20020a05600c198700b0039c5fb1f592sm12410651wmq.14.2022.06.14.05.31.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Jun 2022 05:31:05 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [PATCH for-next 25/25] io_uring: mutex locked poll hashing Date: Tue, 14 Jun 2022 13:30:03 +0100 Message-Id: X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Currently we do two extra spin lock/unlock pairs to add a poll/apoll request to the cancellation hash table and remove it from there. On the submission side we often already hold ->uring_lock and tw completion is likely to hold it as well. Add a second cancellation hash table protected by ->uring_lock. In concerns for latency because of a need to have the mutex locked on the completion side, use the new table only in following cases: 1) IORING_SETUP_SINGLE_ISSUER: only one task grabs uring_lock, so there is no contention and so the main tw hander will always end up grabbing it before calling into callbacks. 2) IORING_SETUP_SQPOLL: same as with single issuer, only one task is using ->uring_lock. 3) apoll: we normally grab the lock on the completion side anyway to execute the request, so it's free. Signed-off-by: Pavel Begunkov --- io_uring/io_uring.c | 9 +++- io_uring/io_uring_types.h | 4 ++ io_uring/poll.c | 111 ++++++++++++++++++++++++++++++-------- 3 files changed, 102 insertions(+), 22 deletions(-) diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 64a945fe47f5..169947b3679e 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -731,6 +731,8 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) hash_bits = clamp(hash_bits, 1, 8); if (io_alloc_hash_table(&ctx->cancel_table, hash_bits)) goto err; + if (io_alloc_hash_table(&ctx->cancel_table_locked, hash_bits)) + goto err; ctx->dummy_ubuf = kzalloc(sizeof(*ctx->dummy_ubuf), GFP_KERNEL); if (!ctx->dummy_ubuf) @@ -773,6 +775,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p) err: kfree(ctx->dummy_ubuf); kfree(ctx->cancel_table.hbs); + kfree(ctx->cancel_table_locked.hbs); kfree(ctx->io_bl); xa_destroy(&ctx->io_bl_xa); kfree(ctx); @@ -3056,6 +3059,7 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx) if (ctx->hash_map) io_wq_put_hash(ctx->hash_map); kfree(ctx->cancel_table.hbs); + kfree(ctx->cancel_table_locked.hbs); kfree(ctx->dummy_ubuf); kfree(ctx->io_bl); xa_destroy(&ctx->io_bl_xa); @@ -3217,12 +3221,13 @@ static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) __io_cqring_overflow_flush(ctx, true); xa_for_each(&ctx->personalities, index, creds) io_unregister_personality(ctx, index); + if (ctx->rings) + io_poll_remove_all(ctx, NULL, true); mutex_unlock(&ctx->uring_lock); /* failed during ring init, it couldn't have issued any requests */ if (ctx->rings) { io_kill_timeouts(ctx, NULL, true); - io_poll_remove_all(ctx, NULL, true); /* if we failed setting up the ctx, we might not have any rings */ io_iopoll_try_reap_events(ctx); } @@ -3347,7 +3352,9 @@ static __cold void io_uring_try_cancel_requests(struct io_ring_ctx *ctx, } ret |= io_cancel_defer_files(ctx, task, cancel_all); + mutex_lock(&ctx->uring_lock); ret |= io_poll_remove_all(ctx, task, cancel_all); + mutex_unlock(&ctx->uring_lock); ret |= io_kill_timeouts(ctx, task, cancel_all); if (task) ret |= io_run_task_work(); diff --git a/io_uring/io_uring_types.h b/io_uring/io_uring_types.h index d1ce3735aca1..6c3c3c88223a 100644 --- a/io_uring/io_uring_types.h +++ b/io_uring/io_uring_types.h @@ -189,6 +189,7 @@ struct io_ring_ctx { struct xarray io_bl_xa; struct list_head io_buffers_cache; + struct io_hash_table cancel_table_locked; struct list_head cq_overflow_list; struct list_head apoll_cache; struct xarray personalities; @@ -323,6 +324,7 @@ enum { /* keep async read/write and isreg together and in order */ REQ_F_SUPPORT_NOWAIT_BIT, REQ_F_ISREG_BIT, + REQ_F_HASH_LOCKED_BIT, /* not a real bit, just to check we're not overflowing the space */ __REQ_F_LAST_BIT, @@ -388,6 +390,8 @@ enum { REQ_F_APOLL_MULTISHOT = BIT(REQ_F_APOLL_MULTISHOT_BIT), /* recvmsg special flag, clear EPOLLIN */ REQ_F_CLEAR_POLLIN = BIT(REQ_F_CLEAR_POLLIN_BIT), + /* hashed into ->cancel_hash_locked */ + REQ_F_HASH_LOCKED = BIT(REQ_F_HASH_LOCKED_BIT), }; typedef void (*io_req_tw_func_t)(struct io_kiocb *req, bool *locked); diff --git a/io_uring/poll.c b/io_uring/poll.c index db7357de7f8c..5eb805b97f5d 100644 --- a/io_uring/poll.c +++ b/io_uring/poll.c @@ -93,6 +93,26 @@ static void io_poll_req_delete(struct io_kiocb *req, struct io_ring_ctx *ctx) spin_unlock(lock); } +static void io_poll_req_insert_locked(struct io_kiocb *req) +{ + struct io_hash_table *table = &req->ctx->cancel_table_locked; + u32 index = hash_long(req->cqe.user_data, table->hash_bits); + + hlist_add_head(&req->hash_node, &table->hbs[index].list); +} + +static void io_poll_tw_hash_eject(struct io_kiocb *req, bool *locked) +{ + struct io_ring_ctx *ctx = req->ctx; + + if (req->flags & REQ_F_HASH_LOCKED) { + io_tw_lock(ctx, locked); + hash_del(&req->hash_node); + } else { + io_poll_req_delete(req, ctx); + } +} + static void io_init_poll_iocb(struct io_poll *poll, __poll_t events, wait_queue_func_t wake_func) { @@ -217,7 +237,6 @@ static int io_poll_check_events(struct io_kiocb *req, bool *locked) static void io_poll_task_func(struct io_kiocb *req, bool *locked) { - struct io_ring_ctx *ctx = req->ctx; int ret; ret = io_poll_check_events(req, locked); @@ -234,7 +253,8 @@ static void io_poll_task_func(struct io_kiocb *req, bool *locked) } io_poll_remove_entries(req); - io_poll_req_delete(req, ctx); + io_poll_tw_hash_eject(req, locked); + io_req_set_res(req, req->cqe.res, 0); io_req_task_complete(req, locked); } @@ -248,7 +268,7 @@ static void io_apoll_task_func(struct io_kiocb *req, bool *locked) return; io_poll_remove_entries(req); - io_poll_req_delete(req, req->ctx); + io_poll_tw_hash_eject(req, locked); if (!ret) io_req_task_submit(req, locked); @@ -442,7 +462,10 @@ static int __io_arm_poll_handler(struct io_kiocb *req, return 0; } - io_poll_req_insert(req); + if (req->flags & REQ_F_HASH_LOCKED) + io_poll_req_insert_locked(req); + else + io_poll_req_insert(req); if (mask && (poll->events & EPOLLET)) { /* can't multishot if failed, just queue the event we've got */ @@ -480,6 +503,15 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) __poll_t mask = POLLPRI | POLLERR | EPOLLET; int ret; + /* + * apoll requests already grab the mutex to complete in the tw handler, + * so removal from the mutex-backed hash is free, use it by default. + */ + if (issue_flags & IO_URING_F_UNLOCKED) + req->flags &= ~REQ_F_HASH_LOCKED; + else + req->flags |= REQ_F_HASH_LOCKED; + if (!def->pollin && !def->pollout) return IO_APOLL_ABORTED; if (!file_can_poll(req->file)) @@ -528,13 +560,10 @@ int io_arm_poll_handler(struct io_kiocb *req, unsigned issue_flags) return IO_APOLL_OK; } -/* - * Returns true if we found and killed one or more poll requests - */ -__cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, - bool cancel_all) +static __cold bool io_poll_remove_all_table(struct task_struct *tsk, + struct io_hash_table *table, + bool cancel_all) { - struct io_hash_table *table = &ctx->cancel_table; unsigned nr_buckets = 1U << table->hash_bits; struct hlist_node *tmp; struct io_kiocb *req; @@ -557,6 +586,17 @@ __cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, return found; } +/* + * Returns true if we found and killed one or more poll requests + */ +__cold bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk, + bool cancel_all) + __must_hold(&ctx->uring_lock) +{ + return io_poll_remove_all_table(tsk, &ctx->cancel_table, cancel_all) | + io_poll_remove_all_table(tsk, &ctx->cancel_table_locked, cancel_all); +} + static struct io_kiocb *io_poll_find(struct io_ring_ctx *ctx, bool poll_only, struct io_cancel_data *cd, struct io_hash_table *table, @@ -616,13 +656,15 @@ static struct io_kiocb *io_poll_file_find(struct io_ring_ctx *ctx, return NULL; } -static bool io_poll_disarm(struct io_kiocb *req) +static int io_poll_disarm(struct io_kiocb *req) { + if (!req) + return -ENOENT; if (!io_poll_get_ownership(req)) - return false; + return -EALREADY; io_poll_remove_entries(req); hash_del(&req->hash_node); - return true; + return 0; } static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd, @@ -646,7 +688,16 @@ static int __io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd, int io_poll_cancel(struct io_ring_ctx *ctx, struct io_cancel_data *cd, unsigned issue_flags) { - return __io_poll_cancel(ctx, cd, &ctx->cancel_table); + int ret; + + ret = __io_poll_cancel(ctx, cd, &ctx->cancel_table); + if (ret != -ENOENT) + return ret; + + io_ring_submit_lock(ctx, issue_flags); + ret = __io_poll_cancel(ctx, cd, &ctx->cancel_table_locked); + io_ring_submit_unlock(ctx, issue_flags); + return ret; } static __poll_t io_poll_parse_events(const struct io_uring_sqe *sqe, @@ -721,6 +772,16 @@ int io_poll_add(struct io_kiocb *req, unsigned int issue_flags) ipt.pt._qproc = io_poll_queue_proc; + /* + * If sqpoll or single issuer, there is no contention for ->uring_lock + * and we'll end up holding it in tw handlers anyway. + */ + if (!(issue_flags & IO_URING_F_UNLOCKED) && + (req->ctx->flags & (IORING_SETUP_SQPOLL | IORING_SETUP_SINGLE_ISSUER))) + req->flags |= REQ_F_HASH_LOCKED; + else + req->flags &= ~REQ_F_HASH_LOCKED; + ret = __io_arm_poll_handler(req, poll, &ipt, poll->events); if (ipt.error) { return ipt.error; @@ -745,20 +806,28 @@ int io_poll_remove(struct io_kiocb *req, unsigned int issue_flags) bool locked; preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table, &bucket); - if (preq) - ret2 = io_poll_disarm(preq); + ret2 = io_poll_disarm(preq); if (bucket) spin_unlock(&bucket->lock); - - if (!preq) { - ret = -ENOENT; + if (!ret2) + goto found; + if (ret2 != -ENOENT) { + ret = ret2; goto out; } - if (!ret2) { - ret = -EALREADY; + + io_ring_submit_lock(ctx, issue_flags); + preq = io_poll_find(ctx, true, &cd, &ctx->cancel_table_locked, &bucket); + ret2 = io_poll_disarm(preq); + if (bucket) + spin_unlock(&bucket->lock); + io_ring_submit_unlock(ctx, issue_flags); + if (ret2) { + ret = ret2; goto out; } +found: if (poll_update->update_events || poll_update->update_user_data) { /* only mask one event flags, keep behavior flags */ if (poll_update->update_events) { -- 2.36.1