From patchwork Thu Jun 16 09:22:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Pavel Begunkov X-Patchwork-Id: 12883637 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 94374C43334 for ; Thu, 16 Jun 2022 09:22:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1359481AbiFPJWv (ORCPT ); Thu, 16 Jun 2022 05:22:51 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47400 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376598AbiFPJWu (ORCPT ); Thu, 16 Jun 2022 05:22:50 -0400 Received: from mail-wm1-x332.google.com (mail-wm1-x332.google.com [IPv6:2a00:1450:4864:20::332]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D7E211174 for ; Thu, 16 Jun 2022 02:22:48 -0700 (PDT) Received: by mail-wm1-x332.google.com with SMTP id a10so422660wmj.5 for ; Thu, 16 Jun 2022 02:22:48 -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=+oR3rNXZgU1ixzRI7JxN2AwlqFap+l1SjK5ceoxKnGA=; b=BwAdIGhAhpc7c501cFHLJotqPAyCzl6wkmPjxgsOnqKqo6F6kEje8zJHT5kcObE8FD Buu+qfSy9D9VEvXN3F9x3p1ixGCZU2+M7cs4S3rqcfxhToxXYiSYGwIfizNZy03hbQS8 o+Ek7uX/l854KRgrhxAhzDd+U+VJFvTC6lXu6bIMor7jsoZvgAAud7IFJ6npAnGzB4yB DEDEpB3pStbqJ9y+1P4WpOj0o/O2vc/PcRfOtN6mrTxbBImxUCC9B+OwsxtQfJkevz6W e0H3XYZG/j+R8Kwg8oQc+fUQLjFvSCF/20wXPAPNvAjVRsHNMaplGzrXN2pFJ7gS02+G bPUA== 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=+oR3rNXZgU1ixzRI7JxN2AwlqFap+l1SjK5ceoxKnGA=; b=lDRN+PTvfPA1fAbTj6j1H0oEaR4XdXqlwWdKO5PxZXNRuFCnZSIPU16YipEJbYnHgq h9fn8G5THZA0MHphTZdK/bRSXmU0bWNnCPGpzivsyZqd0MY3J97TpQw2dDq+0h2dFiHb W+S/4ZamV+0xtCIOsjn/8/EWcetpqqprwQaglZODfm3rbWz6H8hTQ9wtK+XZ9XZyL6PG LJoghzZaYWgjqkBYK8Dk+FBzAP7uav1Leq2uXAHZa2cXV+VBZsyYxBkpxnpUSloUEm/M 65vsGM1QYegUeSI3RvqTENKAxwRxdZh4YBzgQVX1JDudwiTLXIak2WIGXyMtC2Jk71v/ DhfA== X-Gm-Message-State: AOAM530OGcPAWeZmc96mvKK7/YGPHQxmBEtxzHa50w7PpGFyqi94dit+ VVDyTSt168PMfhc2CL8/sFwYW0mWMFhrYA== X-Google-Smtp-Source: ABdhPJwR2kkyCWmw0lVe9Oxc+RMP0YzPJG7P2+tVLDkV33mFEb41aT+tnP6UpHd2iUqVKX9HFvbPYg== X-Received: by 2002:a05:600c:348d:b0:39c:652b:5153 with SMTP id a13-20020a05600c348d00b0039c652b5153mr14575342wmq.24.1655371367081; Thu, 16 Jun 2022 02:22:47 -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 s6-20020a1cf206000000b0039c975aa553sm1695221wmc.25.2022.06.16.02.22.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jun 2022 02:22:46 -0700 (PDT) From: Pavel Begunkov To: io-uring@vger.kernel.org Cc: Jens Axboe , asml.silence@gmail.com Subject: [PATCH for-next v3 04/16] io_uring: don't inline io_put_kbuf Date: Thu, 16 Jun 2022 10:22:00 +0100 Message-Id: <2e21ccf0be471ffa654032914b9430813cae53f8.1655371007.git.asml.silence@gmail.com> X-Mailer: git-send-email 2.36.1 In-Reply-To: References: MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org io_put_kbuf() is huge, don't bloat the kernel with inlining. Signed-off-by: Pavel Begunkov --- io_uring/kbuf.c | 33 +++++++++++++++++++++++++++++++++ io_uring/kbuf.h | 38 ++++++-------------------------------- 2 files changed, 39 insertions(+), 32 deletions(-) diff --git a/io_uring/kbuf.c b/io_uring/kbuf.c index 5885343705bd..223d9db2ba94 100644 --- a/io_uring/kbuf.c +++ b/io_uring/kbuf.c @@ -82,6 +82,39 @@ static int io_buffer_add_list(struct io_ring_ctx *ctx, return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL)); } +unsigned int __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags) +{ + unsigned int cflags; + + /* + * We can add this buffer back to two lists: + * + * 1) The io_buffers_cache list. This one is protected by the + * ctx->uring_lock. If we already hold this lock, add back to this + * list as we can grab it from issue as well. + * 2) The io_buffers_comp list. This one is protected by the + * ctx->completion_lock. + * + * We migrate buffers from the comp_list to the issue cache list + * when we need one. + */ + if (req->flags & REQ_F_BUFFER_RING) { + /* no buffers to recycle for this case */ + cflags = __io_put_kbuf_list(req, NULL); + } else if (issue_flags & IO_URING_F_UNLOCKED) { + struct io_ring_ctx *ctx = req->ctx; + + spin_lock(&ctx->completion_lock); + cflags = __io_put_kbuf_list(req, &ctx->io_buffers_comp); + spin_unlock(&ctx->completion_lock); + } else { + lockdep_assert_held(&req->ctx->uring_lock); + + cflags = __io_put_kbuf_list(req, &req->ctx->io_buffers_cache); + } + return cflags; +} + static void __user *io_provided_buffer_select(struct io_kiocb *req, size_t *len, struct io_buffer_list *bl) { diff --git a/io_uring/kbuf.h b/io_uring/kbuf.h index 80b6df2c7535..5da3d4039aed 100644 --- a/io_uring/kbuf.h +++ b/io_uring/kbuf.h @@ -47,6 +47,8 @@ int io_provide_buffers(struct io_kiocb *req, unsigned int issue_flags); int io_register_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg); int io_unregister_pbuf_ring(struct io_ring_ctx *ctx, void __user *arg); +unsigned int __io_put_kbuf(struct io_kiocb *req, unsigned issue_flags); + static inline bool io_do_buffer_select(struct io_kiocb *req) { if (!(req->flags & REQ_F_BUFFER_SELECT)) @@ -70,7 +72,8 @@ static inline void io_kbuf_recycle(struct io_kiocb *req, unsigned issue_flags) __io_kbuf_recycle(req, issue_flags); } -static unsigned int __io_put_kbuf(struct io_kiocb *req, struct list_head *list) +static inline unsigned int __io_put_kbuf_list(struct io_kiocb *req, + struct list_head *list) { if (req->flags & REQ_F_BUFFER_RING) { if (req->buf_list) @@ -90,44 +93,15 @@ static inline unsigned int io_put_kbuf_comp(struct io_kiocb *req) if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))) return 0; - return __io_put_kbuf(req, &req->ctx->io_buffers_comp); + return __io_put_kbuf_list(req, &req->ctx->io_buffers_comp); } static inline unsigned int io_put_kbuf(struct io_kiocb *req, unsigned issue_flags) { - unsigned int cflags; if (!(req->flags & (REQ_F_BUFFER_SELECTED|REQ_F_BUFFER_RING))) return 0; - - /* - * We can add this buffer back to two lists: - * - * 1) The io_buffers_cache list. This one is protected by the - * ctx->uring_lock. If we already hold this lock, add back to this - * list as we can grab it from issue as well. - * 2) The io_buffers_comp list. This one is protected by the - * ctx->completion_lock. - * - * We migrate buffers from the comp_list to the issue cache list - * when we need one. - */ - if (req->flags & REQ_F_BUFFER_RING) { - /* no buffers to recycle for this case */ - cflags = __io_put_kbuf(req, NULL); - } else if (issue_flags & IO_URING_F_UNLOCKED) { - struct io_ring_ctx *ctx = req->ctx; - - spin_lock(&ctx->completion_lock); - cflags = __io_put_kbuf(req, &ctx->io_buffers_comp); - spin_unlock(&ctx->completion_lock); - } else { - lockdep_assert_held(&req->ctx->uring_lock); - - cflags = __io_put_kbuf(req, &req->ctx->io_buffers_cache); - } - - return cflags; + return __io_put_kbuf(req, issue_flags); } #endif