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 D434BC433FE for ; Fri, 10 Dec 2021 07:21:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237435AbhLJHYk (ORCPT ); Fri, 10 Dec 2021 02:24:40 -0500 Received: from out30-56.freemail.mail.aliyun.com ([115.124.30.56]:54860 "EHLO out30-56.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237181AbhLJHYk (ORCPT ); Fri, 10 Dec 2021 02:24:40 -0500 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R791e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04395;MF=haoxu@linux.alibaba.com;NM=1;PH=DS;RN=3;SR=0;TI=SMTPD_---0V-8HLik_1639120863; Received: from 30.226.12.31(mailfrom:haoxu@linux.alibaba.com fp:SMTPD_---0V-8HLik_1639120863) by smtp.aliyun-inc.com(127.0.0.1); Fri, 10 Dec 2021 15:21:04 +0800 Subject: Re: [PATCH 1/2] io_uring: check tctx->in_idle when decrementing inflight_tracked To: Jens Axboe , io-uring@vger.kernel.org Cc: stable@vger.kernel.org References: <20211209155956.383317-1-axboe@kernel.dk> <20211209155956.383317-2-axboe@kernel.dk> From: Hao Xu Message-ID: <2c527587-36c4-900b-bda6-1357d9bb5ba0@linux.alibaba.com> Date: Fri, 10 Dec 2021 15:21:03 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.14.0 MIME-Version: 1.0 In-Reply-To: <20211209155956.383317-2-axboe@kernel.dk> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org 在 2021/12/9 下午11:59, Jens Axboe 写道: > If we have someone potentially waiting for tracked requests to finish, > ensure that we check in_idle and wake them up appropriately. > > Cc: stable@vger.kernel.org > Signed-off-by: Jens Axboe > --- Hi Jens, I saw every/several( in batching cases)  io_clean_op() followed by an io_put_task() which does the same thing as this patch, so it seems this one is not neccessary? Correct me if I'm wrong since I haven't touch this code for a long time. Regards, Hao > fs/io_uring.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/fs/io_uring.c b/fs/io_uring.c > index c4f217613f56..b4d5b8d168bf 100644 > --- a/fs/io_uring.c > +++ b/fs/io_uring.c > @@ -6640,6 +6640,8 @@ static void io_clean_op(struct io_kiocb *req) > struct io_uring_task *tctx = req->task->io_uring; > > atomic_dec(&tctx->inflight_tracked); > + if (unlikely(atomic_read(&tctx->in_idle))) > + wake_up(&tctx->wait); > } > if (req->flags & REQ_F_CREDS) > put_cred(req->creds);