From patchwork Thu Jan 10 02:43:59 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 10755107 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 7282D91E for ; Thu, 10 Jan 2019 02:44:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 647C229442 for ; Thu, 10 Jan 2019 02:44:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 62DE629539; Thu, 10 Jan 2019 02:44:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-7.9 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 36C2929442 for ; Thu, 10 Jan 2019 02:44:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727138AbfAJCoj (ORCPT ); Wed, 9 Jan 2019 21:44:39 -0500 Received: from mail-pl1-f194.google.com ([209.85.214.194]:34789 "EHLO mail-pl1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727130AbfAJCoi (ORCPT ); Wed, 9 Jan 2019 21:44:38 -0500 Received: by mail-pl1-f194.google.com with SMTP id w4so4506804plz.1 for ; Wed, 09 Jan 2019 18:44:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=pIhU8eaLRf7z3l+B8J2n3fyMzAo9urqPpN7Nm7QZZV8=; b=YoeJSUYMkoHTdYD46jvivXBRx+ZRy6kirpF0c+sCukfhm+OyXMfjPQWHvaXngD/jQZ bPJD8dCk39AnBJZodShXRk7SXV04YwjyimD1/vV0aTQAZCqFsV7o9ICEVB9Mhf+uom+F ESqvu7FVNh3YcNDE3aiZCRRWOXQeRfo/onOqvVvEt3unBIqc7S5HGgNINUofxyuJcVOH tGsOwu4bKpP/zp1Ifkam18TG59swiZF23QyQg1HpFcENSvhLb0XgarCU6NszZ+zYycAx Xgp+HFEdDzVCbosu3FoDDqrbxmp5dRHtzm6583BHjvmIPhtaHAYam8XXFJBNspoF1k0k eHgA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=pIhU8eaLRf7z3l+B8J2n3fyMzAo9urqPpN7Nm7QZZV8=; b=opavYLXuK9+rFGnOT83lzHZ8nz+vncaRZFSAEdHksO7xrNUxm0arqO9WUSoFgcfqBw xYBS9vFuarookhK1gkHGqXECMDXAoAkWW2t/aovJbb0yXHMSlX7oWpfdvyI+oW/LPnEz y452cN1y00AcSdQEtRsyHz4CVjEyiY21EenJPltto1+lgI3zlSQDXJVWe8qMQExaUKIJ siksAGy91bJKPzOn2DqylfoK7gmDu+f0GbfDHvM0s7OTD8LS9B2vaCTPzB2+irrhTl5Y 0ieAFjW9R9WD0fgJSjDpULCgmmfS4EaQmojKE68ujuD0N8b2E8OS8zumPDLYslCOeXj5 8vog== X-Gm-Message-State: AJcUukfkIKOO18FLAdk3wdUIlinPfZRi3BFJlkVTrW+2y5Vyn6XlhYjy 66Yp74X+j91te+LRv4Ae1dr0j/qqTO7Ehg== X-Google-Smtp-Source: ALg8bN5Y/ZU0JQk4+nEbRBqJyXjMWKBNi8LzwpeimUqnMyVD/fuTvue8Q8znTZcOPX8P38tVb7oDfQ== X-Received: by 2002:a17:902:9a04:: with SMTP id v4mr8751782plp.34.1547088276902; Wed, 09 Jan 2019 18:44:36 -0800 (PST) Received: from x1.localdomain (66.29.188.166.static.utbb.net. [66.29.188.166]) by smtp.gmail.com with ESMTPSA id v15sm105799631pfn.94.2019.01.09.18.44.34 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 09 Jan 2019 18:44:35 -0800 (PST) From: Jens Axboe To: linux-fsdevel@vger.kernel.org, linux-aio@kvack.org, linux-block@vger.kernel.org, linux-arch@vger.kernel.org Cc: hch@lst.de, jmoyer@redhat.com, avi@scylladb.com, Jens Axboe Subject: [PATCH 10/15] io_uring: batch io_kiocb allocation Date: Wed, 9 Jan 2019 19:43:59 -0700 Message-Id: <20190110024404.25372-11-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190110024404.25372-1-axboe@kernel.dk> References: <20190110024404.25372-1-axboe@kernel.dk> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Similarly to how we use the state->ios_left to know how many references to get to a file, we can use it to allocate the io_kiocb's we need in bulk. Signed-off-by: Jens Axboe --- fs/io_uring.c | 71 +++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 52 insertions(+), 19 deletions(-) diff --git a/fs/io_uring.c b/fs/io_uring.c index cd2dfc153338..b5233786b5a8 100644 --- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -127,6 +127,13 @@ struct io_submit_state { struct list_head req_list; unsigned int req_count; + /* + * io_kiocb alloc cache + */ + void *kiocbs[IO_IOPOLL_BATCH]; + unsigned int free_kiocbs; + unsigned int cur_kiocb; + /* * File reference cache */ @@ -196,36 +203,58 @@ static struct io_uring_cqe *io_peek_cqring(struct io_ring_ctx *ctx) return &ring->cqes[tail & ctx->cq_mask]; } -static struct io_kiocb *io_get_kiocb(struct io_ring_ctx *ctx) +static void io_ring_drop_ctx_refs(struct io_ring_ctx *ctx, unsigned refs) +{ + percpu_ref_put_many(&ctx->refs, refs); + + if (waitqueue_active(&ctx->wait)) + wake_up(&ctx->wait); +} + +static struct io_kiocb *io_get_kiocb(struct io_ring_ctx *ctx, + struct io_submit_state *state) { struct io_kiocb *req; if (!percpu_ref_tryget(&ctx->refs)) return NULL; - req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL); - if (!req) - return NULL; - - req->ki_ctx = ctx; - INIT_LIST_HEAD(&req->ki_list); - req->ki_flags = 0; - return req; -} + if (!state) + req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL); + else if (!state->free_kiocbs) { + size_t sz; + int ret; + + sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->kiocbs)); + ret = kmem_cache_alloc_bulk(kiocb_cachep, GFP_KERNEL, sz, + state->kiocbs); + if (ret <= 0) + goto out; + state->free_kiocbs = ret - 1; + state->cur_kiocb = 1; + req = state->kiocbs[0]; + } else { + req = state->kiocbs[state->cur_kiocb]; + state->free_kiocbs--; + state->cur_kiocb++; + } -static void io_ring_drop_ctx_ref(struct io_ring_ctx *ctx, unsigned refs) -{ - percpu_ref_put_many(&ctx->refs, refs); + if (req) { + req->ki_ctx = ctx; + req->ki_flags = 0; + return req; + } - if (waitqueue_active(&ctx->wait)) - wake_up(&ctx->wait); +out: + io_ring_drop_ctx_refs(ctx, 1); + return NULL; } static void io_free_kiocb_many(struct io_ring_ctx *ctx, void **iocbs, int *nr) { if (*nr) { kmem_cache_free_bulk(kiocb_cachep, *nr, iocbs); - io_ring_drop_ctx_ref(ctx, *nr); + io_ring_drop_ctx_refs(ctx, *nr); *nr = 0; } } @@ -233,7 +262,7 @@ static void io_free_kiocb_many(struct io_ring_ctx *ctx, void **iocbs, int *nr) static void io_free_kiocb(struct io_kiocb *iocb) { kmem_cache_free(kiocb_cachep, iocb); - io_ring_drop_ctx_ref(iocb->ki_ctx, 1); + io_ring_drop_ctx_refs(iocb->ki_ctx, 1); } /* @@ -761,7 +790,7 @@ static int io_submit_sqe(struct io_ring_ctx *ctx, struct sqe_submit *s, if (unlikely(sqe->flags)) return -EINVAL; - req = io_get_kiocb(ctx); + req = io_get_kiocb(ctx, state); if (unlikely(!req)) return -EAGAIN; @@ -828,6 +857,9 @@ static void io_submit_state_end(struct io_submit_state *state) if (!list_empty(&state->req_list)) io_flush_state_reqs(state->ctx, state); io_file_put(state, NULL); + if (state->free_kiocbs) + kmem_cache_free_bulk(kiocb_cachep, state->free_kiocbs, + &state->kiocbs[state->cur_kiocb]); } /* @@ -839,6 +871,7 @@ static void io_submit_state_start(struct io_submit_state *state, state->ctx = ctx; INIT_LIST_HEAD(&state->req_list); state->req_count = 0; + state->free_kiocbs = 0; state->file = NULL; state->ios_left = max_ios; #ifdef CONFIG_BLOCK @@ -1071,7 +1104,7 @@ SYSCALL_DEFINE4(io_uring_enter, unsigned int, fd, u32, to_submit, ret = __io_uring_enter(ctx, to_submit, min_complete, flags); mutex_unlock(&ctx->uring_lock); } - io_ring_drop_ctx_ref(ctx, 1); + io_ring_drop_ctx_refs(ctx, 1); out_fput: fdput(f); return ret;