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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 BA3FEC433E0 for ; Thu, 25 Mar 2021 01:49:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A67261A1A for ; Thu, 25 Mar 2021 01:49:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235828AbhCYBsw (ORCPT ); Wed, 24 Mar 2021 21:48:52 -0400 Received: from szxga06-in.huawei.com ([45.249.212.32]:14887 "EHLO szxga06-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235750AbhCYBsp (ORCPT ); Wed, 24 Mar 2021 21:48:45 -0400 Received: from DGGEMS405-HUB.china.huawei.com (unknown [172.30.72.59]) by szxga06-in.huawei.com (SkyGuard) with ESMTP id 4F5Sdh3lYzzkfHH; Thu, 25 Mar 2021 09:47:04 +0800 (CST) Received: from ubuntu1804.huawei.com (10.67.174.43) by DGGEMS405-HUB.china.huawei.com (10.3.19.205) with Microsoft SMTP Server id 14.3.498.0; Thu, 25 Mar 2021 09:48:40 +0800 From: Dong Kai To: , , , , CC: , , Subject: [PATCH] livepatch: klp_send_signal should treat PF_IO_WORKER like PF_KTHREAD Date: Thu, 25 Mar 2021 09:48:36 +0800 Message-ID: <20210325014836.40649-1-dongkai11@huawei.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.67.174.43] X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org commit 15b2219facad ("kernel: freezer should treat PF_IO_WORKER like PF_KTHREAD for freezing") is to fix the freezeing issue of IO threads by making the freezer not send them fake signals. Here live patching consistency model call klp_send_signals to wake up all tasks by send fake signal to all non-kthread which only check the PF_KTHREAD flag, so it still send signal to io threads which may lead to freezeing issue of io threads. Here we take the same fix action by treating PF_IO_WORKERS as PF_KTHREAD within klp_send_signal function. Signed-off-by: Dong Kai --- note: the io threads freeze issue links: [1] https://lore.kernel.org/io-uring/YEgnIp43%2F6kFn8GL@kevinlocke.name/ [2] https://lore.kernel.org/io-uring/d7350ce7-17dc-75d7-611b-27ebf2cb539b@kernel.dk/ kernel/livepatch/transition.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/livepatch/transition.c b/kernel/livepatch/transition.c index f6310f848f34..0e1c35c8f4b4 100644 --- a/kernel/livepatch/transition.c +++ b/kernel/livepatch/transition.c @@ -358,7 +358,7 @@ static void klp_send_signals(void) * Meanwhile the task could migrate itself and the action * would be meaningless. It is not serious though. */ - if (task->flags & PF_KTHREAD) { + if (task->flags & (PF_KTHREAD | PF_IO_WORKER)) { /* * Wake up a kthread which sleeps interruptedly and * still has not been migrated. -- 2.17.1