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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1FE58C433EF for ; Mon, 24 Jan 2022 17:06:44 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 99D586B00AD; Mon, 24 Jan 2022 12:06:43 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 94C5F6B00AE; Mon, 24 Jan 2022 12:06:43 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7EDBB6B00B0; Mon, 24 Jan 2022 12:06:43 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0059.hostedemail.com [216.40.44.59]) by kanga.kvack.org (Postfix) with ESMTP id 712366B00AD for ; Mon, 24 Jan 2022 12:06:43 -0500 (EST) Received: from smtpin06.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay05.hostedemail.com (Postfix) with ESMTP id 36C2F180C3C6F for ; Mon, 24 Jan 2022 17:06:43 +0000 (UTC) X-FDA: 79065809886.06.23092CA Received: from mail-wr1-f49.google.com (mail-wr1-f49.google.com [209.85.221.49]) by imf10.hostedemail.com (Postfix) with ESMTP id D4AB1C001A for ; Mon, 24 Jan 2022 17:06:42 +0000 (UTC) Received: by mail-wr1-f49.google.com with SMTP id r14so4260362wrc.6 for ; Mon, 24 Jan 2022 09:06:42 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=79KUbqnFovl8PcuSxk5IjbyVvI/kpEfdZ145RDlSlls=; b=XOmRM7d4TxVHfidejk880wpDt1/UvvgXdK/3jt//AlEZ8kOXfrXW1uVSNTFFKjxZCA C2v+s0laubCp0T/F2M1KhNHDAYPIa4oBnG55wyVmMV91QFcO2Kvf9PF4yR/yN9sKvHrG 1DP/JkOPxMskk+4yyoIwqt7wFijpIo+tc7w+jntiuan7oPn9tBYhUJaRq+NjoWluubQM 7lrKcfZM7tScpOEw8pkj+ZftvDartnYHOihAu07vUTaPJqq8leoOfx+HR+5k7eyLmH7x os2+jbWBzU2oQlY3BJbC39rZcVWETEx88WL4wmsT+aCA8Gqw7i6vJJiBleewO9+3zyEf sv0Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=79KUbqnFovl8PcuSxk5IjbyVvI/kpEfdZ145RDlSlls=; b=BpfD9wuxH2jvDTRVpprlsqXexf7R+39NqHpMa1bfH9ijU7GVwlp+jm2w/3NECmKbxa qZuBeTPzxdOMO87/a1ybSm0UD7yi7M7ap2NUAvIS1u0iXgmd84hJk74+9fvfPtyRf+sT uR76NinEIyJMrXIaxaxyr+CoH3D663hQuGVEFtyVBo+1yvIIRluvY0fZqqYwjtZORrRQ QzILW1zmJb2JE/0lfUzcOpdlsoD/d8sgblxcVyvlu2Hl+oha4epcGhPswRYR5HnZrAEk bo9dTgZpkOijhlOQ1jnBy6viliN23ZeHxnHRGfoHwMpICHbJadl40VNbmO6Ntm5lMyxA Zdag== X-Gm-Message-State: AOAM532918VCNaJFXNamGPKuALbzlXwETsIVeTAzW+/bbiTLlPFsYY1n p+TbD+6Y36OXK2ln+ZWfKLcRkKg+J2uNgMRNLU9e6w== X-Google-Smtp-Source: ABdhPJyqVVxCcruvTsXSVTaMipUjCEqLhj13ZjMDqdYRuJ4h+DRF+V96pdHwRfAXJ0FslEzrwCgYkCbcQK7QYqme4MQ= X-Received: by 2002:adf:ec8f:: with SMTP id z15mr14782424wrn.235.1643044001262; Mon, 24 Jan 2022 09:06:41 -0800 (PST) MIME-Version: 1.0 References: <20220120155517.066795336@infradead.org> <20220120160822.914418096@infradead.org> <20220121114758.GF20638@worktop.programming.kicks-ass.net> <20220121151845.GB22849@worktop.programming.kicks-ass.net> In-Reply-To: From: Peter Oskolkov Date: Mon, 24 Jan 2022 09:06:29 -0800 Message-ID: Subject: Re: [RFC][PATCH v2 5/5] sched: User Mode Concurency Groups To: Peter Zijlstra Cc: mingo@redhat.com, tglx@linutronix.de, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-api@vger.kernel.org, x86@kernel.org, pjt@google.com, avagin@google.com, jannh@google.com, tdelisle@uwaterloo.ca, mark.rutland@arm.com, posk@posk.io Content-Type: text/plain; charset="UTF-8" X-Stat-Signature: izi8qxibprnidpqc54aawwaiuj5apeis Authentication-Results: imf10.hostedemail.com; dkim=pass header.d=google.com header.s=20210112 header.b=XOmRM7d4; spf=pass (imf10.hostedemail.com: domain of posk@google.com designates 209.85.221.49 as permitted sender) smtp.mailfrom=posk@google.com; dmarc=pass (policy=reject) header.from=google.com X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: D4AB1C001A X-HE-Tag: 1643044002-796253 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: On Mon, Jan 24, 2022 at 8:44 AM Peter Zijlstra wrote: [...] > > > > Oh how I hate signals... this can get scribbled by a syscall/fault from > > sigcontext :/ > > > > Maybe I can recover the timo argument from the original syscall > > pt_regs.. let me try. I don't think we need to do anything special with timeouts if a signal happens - just normally return -EINTR (after a resume from a server) and let the userspace figure things out. Alternatively, in my version of the patchset UMCG tasks ignore non-fatal signals. :) [...]