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 X-Spam-Level: X-Spam-Status: No, score=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7281CC4361B for ; Fri, 18 Dec 2020 22:01:51 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 19D6323B8C for ; Fri, 18 Dec 2020 22:01:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 19D6323B8C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AB8146B0072; Fri, 18 Dec 2020 17:01:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id A67186B0073; Fri, 18 Dec 2020 17:01:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 97F3A6B0074; Fri, 18 Dec 2020 17:01:50 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id 857396B0072 for ; Fri, 18 Dec 2020 17:01:50 -0500 (EST) Received: from smtpin02.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 4D3AF181BD7A9 for ; Fri, 18 Dec 2020 22:01:50 +0000 (UTC) X-FDA: 77607775980.02.touch96_0a088c527440 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin02.hostedemail.com (Postfix) with ESMTP id 3337E10097AA1 for ; Fri, 18 Dec 2020 22:01:50 +0000 (UTC) X-HE-Tag: touch96_0a088c527440 X-Filterd-Recvd-Size: 3598 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by imf46.hostedemail.com (Postfix) with ESMTP for ; Fri, 18 Dec 2020 22:01:49 +0000 (UTC) Date: Fri, 18 Dec 2020 14:01:48 -0800 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1608328908; bh=k8ft8qdDcoHonV5M34yhMrCBHfaTTVb01zOJWlQ6DGw=; h=From:To:Subject:In-Reply-To:From; b=MBkF4V6kcqOILyxrOOrSQ+vlqcFT20Owv9hC1iUAzgMGQOrfDKpcLODcJXx6hegvk l7EySsmaJzuiL3BIW/O97UMNWxoJgeXREQuK0GGLKyslndDdvqaAekAjJ0tqUpk9gL jEyaim+Fiu3pMiYhiIWz6jiIW8oOOBsioXK6M8NI= From: Andrew Morton To: akpm@linux-foundation.org, edumazet@google.com, guantaol@google.com, khazhy@google.com, linux-mm@kvack.org, mm-commits@vger.kernel.org, soheil@google.com, torvalds@linux-foundation.org, willemb@google.com Subject: [patch 07/78] epoll: simplify signal handling Message-ID: <20201218220148.LntJd0Nd3%akpm@linux-foundation.org> In-Reply-To: <20201218140046.497484741326828e5b5d46ec@linux-foundation.org> User-Agent: s-nail v14.8.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Soheil Hassas Yeganeh Subject: epoll: simplify signal handling Check signals before locking ep->lock, and immediately return -EINTR if there is any signal pending. This saves a few loads, stores, and branches from the hot path and simplifies the loop structure for follow up patches. Link: https://lkml.kernel.org/r/20201106231635.3528496-3-soheil.kdev@gmail.com Signed-off-by: Soheil Hassas Yeganeh Suggested-by: Linus Torvalds Reviewed-by: Eric Dumazet Reviewed-by: Willem de Bruijn Reviewed-by: Khazhismel Kumykov Cc: Guantao Liu Signed-off-by: Andrew Morton --- fs/eventpoll.c | 20 ++++++++++---------- 1 file changed, 10 insertions(+), 10 deletions(-) --- a/fs/eventpoll.c~epoll-simplify-signal-handling +++ a/fs/eventpoll.c @@ -1733,7 +1733,7 @@ static inline struct timespec64 ep_set_m static int ep_poll(struct eventpoll *ep, struct epoll_event __user *events, int maxevents, long timeout) { - int res = 0, eavail, timed_out = 0; + int res, eavail, timed_out = 0; u64 slack = 0; wait_queue_entry_t wait; ktime_t expires, *to = NULL; @@ -1780,6 +1780,9 @@ fetch_events: ep_reset_busy_poll_napi_id(ep); do { + if (signal_pending(current)) + return -EINTR; + /* * Internally init_wait() uses autoremove_wake_function(), * thus wait entry is removed from the wait queue on each @@ -1809,15 +1812,12 @@ fetch_events: * important. */ eavail = ep_events_available(ep); - if (!eavail) { - if (signal_pending(current)) - res = -EINTR; - else - __add_wait_queue_exclusive(&ep->wq, &wait); - } + if (!eavail) + __add_wait_queue_exclusive(&ep->wq, &wait); + write_unlock_irq(&ep->lock); - if (!eavail && !res) + if (!eavail) timed_out = !schedule_hrtimeout_range(to, slack, HRTIMER_MODE_ABS); @@ -1853,14 +1853,14 @@ send_events: * finding more events available and fetching * repeatedly. */ - res = -EINTR; + return -EINTR; } /* * Try to transfer events to user space. In case we get 0 events and * there's still timeout left over, we go trying again in search of * more luck. */ - if (!res && eavail && + if (eavail && !(res = ep_send_events(ep, events, maxevents)) && !timed_out) goto fetch_events; _