From patchwork Mon Nov 26 16:45:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jens Axboe X-Patchwork-Id: 10698679 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 7083917D5 for ; Mon, 26 Nov 2018 16:46:08 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 61F1F2A087 for ; Mon, 26 Nov 2018 16:46:08 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 568BE2A08C; Mon, 26 Nov 2018 16:46:08 +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 0537A2A087 for ; Mon, 26 Nov 2018 16:46:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726410AbeK0Dkp (ORCPT ); Mon, 26 Nov 2018 22:40:45 -0500 Received: from mail-it1-f193.google.com ([209.85.166.193]:54570 "EHLO mail-it1-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727082AbeK0Dkp (ORCPT ); Mon, 26 Nov 2018 22:40:45 -0500 Received: by mail-it1-f193.google.com with SMTP id m123-v6so5069799ita.4 for ; Mon, 26 Nov 2018 08:46:06 -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=sgBueyD41WcD6YGB1PXXB7qHQZZJctD1Yvvmpvxoomc=; b=fzMXQnJBDQ12o1SCpVJ0wTAHz6XhLyu3SvL2bffUfqUh1V7cFkmYKtx+O8Nie0UUH8 yEv39/xjpjR+UU0IqFdAE3I0TGU426cz8a/dWippznmaCnIUD8DRCyPUS8L7RiWd0PzL K9NNoPMG9glOb2KD97yBgYdQS6PHgPTYt7Fj26L/H6J3Lt4mtqtETTWcEpU2M7fnCgwi AVwi71pt1Mydwy+d6goLkZKrueJiZqOG2L8d94RcKKPAdhEx3qPAAUy2UvMMaOeFn0sn 46u1ah82QLykjCaIo4B5Hjmjf2UjVB1PE8LSePGJmbWd2UtWq4LDqYMouG46GFAGfwRK JH3Q== 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=sgBueyD41WcD6YGB1PXXB7qHQZZJctD1Yvvmpvxoomc=; b=W+ClUFsCBUoLTWFp2q7+USKkN4GDRJFM1DOdkiG2lOwJ+TFOvtpNLZc2mndrijI+35 E+Nu9WglCIGTvad3f7f1KnsXDormKR+sVyCRxG2LLlF6K/qZdICqXFMlnqmJh1FAvU78 p81LI50QpasZzwOz+AeCsbwra537p1/gszuq0sKNnxnHy8gguRh8hTMA1fJiwl0lLfLw 18Wuv227HEL1/vFbDSIyefGovkB+OOD7b8Eg+FXQBAdyVzlQ7s/Uc6R5FlbGeWRU7iYh wC/NWy0oEybTyuM1ne/EbyBeVcTeEuxqqrNXx1+v6jAPc63FRF4+SaGHJTjVTEcitklL wlrA== X-Gm-Message-State: AA+aEWY91bVcURVXPH4EvZN/0++l+n2vJrkaKOP3A1wvQfg67jaqb7bM tNC3nIqx1qK8SXSDdSRz/kFyk9mc638= X-Google-Smtp-Source: AFSGD/U0UjEjF6tNASkpLnca4/HGYyUBxqCAafb4XiHHQ1nvARl6VBgbi58+SEbIaCWGKvYffdVZ5A== X-Received: by 2002:a24:89:: with SMTP id 131mr4630058ita.105.1543250765420; Mon, 26 Nov 2018 08:46:05 -0800 (PST) Received: from localhost.localdomain ([216.160.245.98]) by smtp.gmail.com with ESMTPSA id t65-v6sm486801ita.9.2018.11.26.08.46.03 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 26 Nov 2018 08:46:04 -0800 (PST) From: Jens Axboe To: linux-block@vger.kernel.org, linux-aio@kvack.org, linux-fsdevel@vger.kernel.org Cc: Jens Axboe Subject: [PATCH 09/20] aio: separate out ring reservation from req allocation Date: Mon, 26 Nov 2018 09:45:33 -0700 Message-Id: <20181126164544.5699-10-axboe@kernel.dk> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20181126164544.5699-1-axboe@kernel.dk> References: <20181126164544.5699-1-axboe@kernel.dk> Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This is in preparation for certain types of IO not needing a ring reserveration. Signed-off-by: Jens Axboe --- fs/aio.c | 30 +++++++++++++++++------------- 1 file changed, 17 insertions(+), 13 deletions(-) diff --git a/fs/aio.c b/fs/aio.c index cf0de61743e8..eaceb40e6cf5 100644 --- a/fs/aio.c +++ b/fs/aio.c @@ -901,7 +901,7 @@ static void put_reqs_available(struct kioctx *ctx, unsigned nr) local_irq_restore(flags); } -static bool get_reqs_available(struct kioctx *ctx) +static bool __get_reqs_available(struct kioctx *ctx) { struct kioctx_cpu *kcpu; bool ret = false; @@ -993,6 +993,14 @@ static void user_refill_reqs_available(struct kioctx *ctx) spin_unlock_irq(&ctx->completion_lock); } +static bool get_reqs_available(struct kioctx *ctx) +{ + if (__get_reqs_available(ctx)) + return true; + user_refill_reqs_available(ctx); + return __get_reqs_available(ctx); +} + /* aio_get_req * Allocate a slot for an aio request. * Returns NULL if no requests are free. @@ -1001,24 +1009,15 @@ static inline struct aio_kiocb *aio_get_req(struct kioctx *ctx) { struct aio_kiocb *req; - if (!get_reqs_available(ctx)) { - user_refill_reqs_available(ctx); - if (!get_reqs_available(ctx)) - return NULL; - } - req = kmem_cache_alloc(kiocb_cachep, GFP_KERNEL|__GFP_ZERO); if (unlikely(!req)) - goto out_put; + return NULL; percpu_ref_get(&ctx->reqs); INIT_LIST_HEAD(&req->ki_list); refcount_set(&req->ki_refcnt, 0); req->ki_ctx = ctx; return req; -out_put: - put_reqs_available(ctx, 1); - return NULL; } static struct kioctx *lookup_ioctx(unsigned long ctx_id) @@ -1805,9 +1804,13 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, return -EINVAL; } + if (!get_reqs_available(ctx)) + return -EAGAIN; + + ret = -EAGAIN; req = aio_get_req(ctx); if (unlikely(!req)) - return -EAGAIN; + goto out_put_reqs_available; if (iocb.aio_flags & IOCB_FLAG_RESFD) { /* @@ -1870,11 +1873,12 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb, goto out_put_req; return 0; out_put_req: - put_reqs_available(ctx, 1); percpu_ref_put(&ctx->reqs); if (req->ki_eventfd) eventfd_ctx_put(req->ki_eventfd); kmem_cache_free(kiocb_cachep, req); +out_put_reqs_available: + put_reqs_available(ctx, 1); return ret; }