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 B32DDC433F5 for ; Sat, 7 May 2022 09:30:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1388529AbiEGJen (ORCPT ); Sat, 7 May 2022 05:34:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40416 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1446230AbiEGJef (ORCPT ); Sat, 7 May 2022 05:34:35 -0400 Received: from mail-wr1-x42c.google.com (mail-wr1-x42c.google.com [IPv6:2a00:1450:4864:20::42c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2719737AA3; Sat, 7 May 2022 02:30:39 -0700 (PDT) Received: by mail-wr1-x42c.google.com with SMTP id w4so12995322wrg.12; Sat, 07 May 2022 02:30:39 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=message-id:date:mime-version:user-agent:subject:content-language:to :cc:references:from:in-reply-to:content-transfer-encoding; bh=ES1pXES2giJ8KOF2aZPm/MgYCN7hJ8uCPToioT3vSKs=; b=jSC17tjp6qzS/TpMVbtEd3Tg3zARblNvdAY1Ol5n6O16uGUYiFhyaQ5IPZeNPENces Dzpc8yaGxYch+5sLvI2aX0jDyBAZMYZubczfUwqd7MT2/BIy2e1nZOkoz5sM/4cD5VYw HwkM/tPKHOeJJuESNfYtyy4lpnjQjg4gN43ePwUGyq+984io82+Jx1iLIKzkAma0lsBS hun80wMgtVHxvYb98TxN5bUCBrkO9u7EIm7AY5GGycimRBsic6j05Y+1ny/ebiF1rel5 jZ+PZ3gr4Mj6i4bLEdpiImP5BcolBKzATl1ywC2leaTQCqjhBYg/++ezVOXtM/qFLzdk oqgQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=ES1pXES2giJ8KOF2aZPm/MgYCN7hJ8uCPToioT3vSKs=; b=oGNDtnz255rYZLvimwhD2XWAczug3j0tfGYeQqbSpInynEB4ByXFnOydnruTAAe+vg qfWKGZuhh05y1ENwaB0/zlLnkuXi8/mhW17ZWuQn3LkFcmDI/SO57VCXjPgqIqeC/hyY nNvG4n7IHpJJSwqpE683O0Q8arAhpkgYO59nsNFeKZpNa3hxo92H83ediiGy1dkYeKO/ tAwfseB0rvMOR+Dpscx65t0tAZ9vPwP7PYnebJhu3iZ8NBigNuLPSviQDd329KOpU8gk iN0r3zkJLjFm0u0yDCwOvD7HvQs9DX+S33FBDD3RLXNYew/eLN46go4vc7qgqVJo9tbb yeMQ== X-Gm-Message-State: AOAM531+F0h8FUA0P3AsCRXUcuA9TnnulOg7Q7s68KtHUd9LBeY7t6Ub cSGAAOZdrLcWDHsdE3z8Av0= X-Google-Smtp-Source: ABdhPJyrVpIY+vTyGlo87mvnoS+sNlIByrIXT7/AAwWQ2aOO5XIqXpXxisQ9QoeGQYGl/fUPDqqmtg== X-Received: by 2002:a5d:61c2:0:b0:20a:d92f:9056 with SMTP id q2-20020a5d61c2000000b0020ad92f9056mr5903610wrv.652.1651915838375; Sat, 07 May 2022 02:30:38 -0700 (PDT) Received: from [192.168.8.198] ([85.255.237.69]) by smtp.gmail.com with ESMTPSA id n11-20020a056000170b00b0020c5253d8c7sm5396924wrc.19.2022.05.07.02.30.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sat, 07 May 2022 02:30:37 -0700 (PDT) Message-ID: Date: Sat, 7 May 2022 10:29:58 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.8.1 Subject: Re: [PATCH 4/5] io_uring: add a helper for poll clean Content-Language: en-US To: Hao Xu , io-uring@vger.kernel.org Cc: Jens Axboe , linux-kernel@vger.kernel.org References: <20220506070102.26032-1-haoxu.linux@gmail.com> <20220506070102.26032-5-haoxu.linux@gmail.com> <28b1901e-3eb2-2a50-525c-62e1aa39eaac@gmail.com> <6f59afd3-a591-90fd-0428-3572d910b689@gmail.com> From: Pavel Begunkov In-Reply-To: <6f59afd3-a591-90fd-0428-3572d910b689@gmail.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/7/22 07:43, Hao Xu wrote: > 在 2022/5/7 上午12:22, Pavel Begunkov 写道: >> On 5/6/22 08:01, Hao Xu wrote: >>> From: Hao Xu >>> >>> Add a helper for poll clean, it will be used in the multishot accept in >>> the later patches. >>> >>> Signed-off-by: Hao Xu >>> --- >>>   fs/io_uring.c | 23 ++++++++++++++++++----- >>>   1 file changed, 18 insertions(+), 5 deletions(-) >>> >>> diff --git a/fs/io_uring.c b/fs/io_uring.c >>> index d33777575faf..0a83ecc457d1 100644 >>> --- a/fs/io_uring.c >>> +++ b/fs/io_uring.c >>> @@ -5711,6 +5711,23 @@ static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe) >>>       return 0; >>>   } >>> +static inline void __io_poll_clean(struct io_kiocb *req) >>> +{ >>> +    struct io_ring_ctx *ctx = req->ctx; >>> + >>> +    io_poll_remove_entries(req); >>> +    spin_lock(&ctx->completion_lock); >>> +    hash_del(&req->hash_node); >>> +    spin_unlock(&ctx->completion_lock); >>> +} >>> + >>> +#define REQ_F_APOLL_MULTI_POLLED (REQ_F_APOLL_MULTISHOT | REQ_F_POLLED) >>> +static inline void io_poll_clean(struct io_kiocb *req) >>> +{ >>> +    if ((req->flags & REQ_F_APOLL_MULTI_POLLED) == REQ_F_APOLL_MULTI_POLLED) >> >> So it triggers for apoll multishot only when REQ_F_POLLED is _not_ set, >> but if it's not set it did never go through arm_poll / etc. and there is >> nothing to clean up. What is the catch? > > No, it is triggered for apoll multishot only when REQ_F_POLLED is set.. Ok, see it now, probably confused REQ_F_APOLL_MULTI_POLLED on the right hand side with something else >> btw, don't see the function used in this patch, better to add it later >> or at least mark with attribute unused, or some may get build failures. > Gotcha. >> >> >>> +        __io_poll_clean(req); >>> +} >>> + >>>   static int io_accept(struct io_kiocb *req, unsigned int issue_flags) >>>   { >>>       struct io_accept *accept = &req->accept; >>> @@ -6041,17 +6058,13 @@ static void io_poll_task_func(struct io_kiocb *req, bool *locked) >>>   static void io_apoll_task_func(struct io_kiocb *req, bool *locked) >>>   { >>> -    struct io_ring_ctx *ctx = req->ctx; >>>       int ret; >>>       ret = io_poll_check_events(req, locked); >>>       if (ret > 0) >>>           return; >>> -    io_poll_remove_entries(req); >>> -    spin_lock(&ctx->completion_lock); >>> -    hash_del(&req->hash_node); >>> -    spin_unlock(&ctx->completion_lock); >>> +    __io_poll_clean(req); >>>       if (!ret) >>>           io_req_task_submit(req, locked); >> > -- Pavel Begunkov