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=-10.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=unavailable 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 B7E33C433E0 for ; Thu, 25 Mar 2021 16:30:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8A30061A33 for ; Thu, 25 Mar 2021 16:30:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229833AbhCYQaC (ORCPT ); Thu, 25 Mar 2021 12:30:02 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49516 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229779AbhCYQ3q (ORCPT ); Thu, 25 Mar 2021 12:29:46 -0400 Received: from mail-io1-xd2e.google.com (mail-io1-xd2e.google.com [IPv6:2607:f8b0:4864:20::d2e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5DD58C06175F for ; Thu, 25 Mar 2021 09:29:46 -0700 (PDT) Received: by mail-io1-xd2e.google.com with SMTP id f19so2518202ion.3 for ; Thu, 25 Mar 2021 09:29:46 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel-dk.20150623.gappssmtp.com; s=20150623; h=subject:to:cc:references:from:message-id:date:user-agent :mime-version:in-reply-to:content-language:content-transfer-encoding; bh=PSF0pivwzy3fBYbfzo8IgvCNBR/Hw3crvEop98fZXCg=; b=n/ll6FIqeHJKlpZG8seLI/5tmNYd1JNATCmHWlxI1aibGm2zob8+SEERP8L/XkU0UT aoPUovkhVPFlyxakHzue+mQ+SDVZK0BPhyCywSivUGhdOeewfRNOFPdqFRk3qavaoE2A KWhPPy8RE/oAsQW3LO6DUnC4LGTsetvZt5ZKwI96360hTpqwkl5a136I6bdXoXAVJ5OT yXVPCmcYQLEeUYYAU4D1u0aGZpSI6CmlLdCy2nnAPAnLHnl7f6EUu8MOe2UaMSrvnQdm vUHd0tJJqp81YYy3K1jLxT1LMIvoF6WiwLHVFYNrigG4Xhu3ADxWsUhtzWgPaiSBk+1g nrDA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=PSF0pivwzy3fBYbfzo8IgvCNBR/Hw3crvEop98fZXCg=; b=MkM9AcHEtkjJ9EoYvynh+sx3jQZprjDgksAZWekQ0pgizn7Cq9vCkgAMA0dyuBnJ+H zmkVhi09Q18vlFNW2gSbuEX9mb5V9OYocQMIPVjN4aUdZzEls81+5zrtmmeQSNTZ2JDs xXAPHvAIyRySXxdLIM4xt3OS0kweeuUiHaleUinPIvfI0UkxsbMMUAMZ1ECDgyDXM43C d8qKq6J4cpJp59OfyUoT1D+MOU9g789EKCWjp6ETftdIm0hVYdWQwS1lRqp6ts1T+huv HQx0RhR+J/UWOwqegzbECVNk7es6h3U4cG2e/S2vRIXUl195FublRo8VXjxSj433oJ0c e7Ew== X-Gm-Message-State: AOAM533kHdX+4exyxaEOPtwM0iKEziyJ9/2xUcYylt98P4RpQODokCZ4 O2NjUhQsLRdYsBWOdPvV2XcNbh04TivH+g== X-Google-Smtp-Source: ABdhPJydx5+yyeRQGFt1qi82utbriCQ1JZmy6qkm1FzVoBRb9wH/6bcFzkNbgwRAr4rpxnTwHrw3Ag== X-Received: by 2002:a05:6602:26cc:: with SMTP id g12mr6746649ioo.169.1616689785483; Thu, 25 Mar 2021 09:29:45 -0700 (PDT) Received: from [192.168.1.30] ([65.144.74.34]) by smtp.gmail.com with ESMTPSA id m1sm2667686ilh.69.2021.03.25.09.29.44 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 25 Mar 2021 09:29:45 -0700 (PDT) Subject: Re: [PATCH] livepatch: klp_send_signal should treat PF_IO_WORKER like PF_KTHREAD To: Dong Kai , jpoimboe@redhat.com, jikos@kernel.org, mbenes@suse.cz, pmladek@suse.com, joe.lawrence@redhat.com Cc: live-patching@vger.kernel.org, linux-kernel@vger.kernel.org References: <20210325014836.40649-1-dongkai11@huawei.com> From: Jens Axboe Message-ID: <832b5870-b926-3ccb-155d-3c364ee5508d@kernel.dk> Date: Thu, 25 Mar 2021 10:29:44 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20210325014836.40649-1-dongkai11@huawei.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 3/24/21 7:48 PM, Dong Kai wrote: > 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. Reviewed-by: Jens Axboe -- Jens Axboe