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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 176ACC433E7 for ; Sat, 18 Jul 2020 08:34:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E94B32073E for ; Sat, 18 Jul 2020 08:34:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="M2s4NCYD" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729133AbgGRIe4 (ORCPT ); Sat, 18 Jul 2020 04:34:56 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41382 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729015AbgGRIev (ORCPT ); Sat, 18 Jul 2020 04:34:51 -0400 Received: from mail-lj1-x241.google.com (mail-lj1-x241.google.com [IPv6:2a00:1450:4864:20::241]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E2C62C0619D3; Sat, 18 Jul 2020 01:34:50 -0700 (PDT) Received: by mail-lj1-x241.google.com with SMTP id q7so15309077ljm.1; Sat, 18 Jul 2020 01:34:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:subject:date:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=QYsmohHX4ln1V0gQOEGp8gE+5TZzMMGOeU8S/vpgEPo=; b=M2s4NCYDfJimKFQMOmTfY4Xvpulv2i8U+qQt4ANGT+CErJXdML4ivd78j/XVD9R77I W4ajBPu2Ltwo45UJmlIgGXukRnpsrNcGdev+JoCiW/kSfIeS6AFCcYbsBOWs9+1Rlj0n ig2imsD1/aLyTR5qqIiFIlNNwU0DOwCjqxfE3op/xPhoPFHDZfRmjvF/nPO0kJmfyhSJ YYg2O/8NQFbmp//EeDUhMrY1iySIE2R0pJ54UdToBiXWd90aREXDDa65QxVcuK0ZH+fn dScO79Xhmlp4LaRN9Yxpy/Ng9fiScLZIogznwO37C+4YwjFamjep0PluMJvYsnJUrNGP Oh7w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=QYsmohHX4ln1V0gQOEGp8gE+5TZzMMGOeU8S/vpgEPo=; b=N8AibMJ2cZSnUTfOjbaNhCGHJH1lK0/2RVW3UBAUYjBSpEqdo7y269RnSarLiyDjs3 XLOhZWYwbqudzSYx3+RGfuU7ToG+iMQo9YN+lPV863JzqY0U0AUZ1hR4/pUKw9puvf93 qMGUS/A2Ybsu2kb4SnmzMafZ1ZZ8zWKwGsEjD65I5SUDkTmZc6y13tXlbCyMbsbmb3kR kmDIJ/pAQTj46nuPFDQ6c5hMfe4YaacN8TArlV5j5FCPR192fz6Xs5R6vKkRIn54/lPr SnsU71KdZ0iHSn9Mprql1yvdfQ/69jUHl47itJx+rRgyGzpAFsYyYqiKfRs4d9TDnAUQ 51jw== X-Gm-Message-State: AOAM533y4T0qQ3VKG7B4Z6kduRVO+Qo55TtWqfjBQrs/ZXtIfgbIz0Nm V8O6We36ucAGQ+s/jWVusTA/Qqyb X-Google-Smtp-Source: ABdhPJyQ5aDJMIiAzOmkliORJIVZKK6iYVcEk3DBcZzY7O/fEaLm3XtksjIeGlZuOczK5ku4yNiZ9A== X-Received: by 2002:a2e:9a0f:: with SMTP id o15mr6279795lji.450.1595061289390; Sat, 18 Jul 2020 01:34:49 -0700 (PDT) Received: from localhost.localdomain ([82.209.196.123]) by smtp.gmail.com with ESMTPSA id u26sm2789226lfq.72.2020.07.18.01.34.48 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 18 Jul 2020 01:34:48 -0700 (PDT) From: Pavel Begunkov To: Jens Axboe , io-uring@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] io_uring: batch put_task_struct() Date: Sat, 18 Jul 2020 11:32:52 +0300 Message-Id: <8a0e399414ec362ee0c587f4bdca968d4fa04be7.1595021626.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.24.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As every iopoll request have a task ref, it becomes expensive to put them one by one, instead we can put several at once integrating that into io_req_free_batch(). Signed-off-by: Pavel Begunkov --- fs/io_uring.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index 57e1f26b6a6b..b52aa0d8b09d 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1543,7 +1543,6 @@ static void io_dismantle_req(struct io_kiocb *req) kfree(req->io); if (req->file) io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE)); - __io_put_req_task(req); io_req_clean_work(req); if (req->flags & REQ_F_INFLIGHT) { @@ -1563,6 +1562,7 @@ static void __io_free_req(struct io_kiocb *req) struct io_ring_ctx *ctx; io_dismantle_req(req); + __io_put_req_task(req); ctx = req->ctx; if (likely(!io_is_fallback_req(req))) kmem_cache_free(req_cachep, req); @@ -1806,8 +1806,18 @@ static void io_free_req(struct io_kiocb *req) struct req_batch { void *reqs[IO_IOPOLL_BATCH]; int to_free; + + struct task_struct *task; + int task_refs; }; +static inline void io_init_req_batch(struct req_batch *rb) +{ + rb->to_free = 0; + rb->task_refs = 0; + rb->task = NULL; +} + static void __io_req_free_batch_flush(struct io_ring_ctx *ctx, struct req_batch *rb) { @@ -1821,6 +1831,10 @@ static void io_req_free_batch_finish(struct io_ring_ctx *ctx, { if (rb->to_free) __io_req_free_batch_flush(ctx, rb); + if (rb->task) { + put_task_struct_many(rb->task, rb->task_refs); + rb->task = NULL; + } } static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) @@ -1832,6 +1846,16 @@ static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req) if (req->flags & REQ_F_LINK_HEAD) io_queue_next(req); + if (req->flags & REQ_F_TASK_PINNED) { + if (req->task != rb->task && rb->task) { + put_task_struct_many(rb->task, rb->task_refs); + rb->task = req->task; + rb->task_refs = 0; + } + rb->task_refs++; + req->flags &= ~REQ_F_TASK_PINNED; + } + io_dismantle_req(req); rb->reqs[rb->to_free++] = req; if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs))) @@ -1977,7 +2001,7 @@ static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events, /* order with ->result store in io_complete_rw_iopoll() */ smp_rmb(); - rb.to_free = 0; + io_init_req_batch(&rb); while (!list_empty(done)) { int cflags = 0; -- 2.24.0