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=0.3 required=3.0 tests=DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS,T_DKIM_INVALID, URG_BIZ autolearn=no 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 6CF88C6778A for ; Mon, 9 Jul 2018 11:12:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 07EBC2087C for ; Mon, 9 Jul 2018 11:12:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZvE7T1QP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 07EBC2087C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932675AbeGILMV (ORCPT ); Mon, 9 Jul 2018 07:12:21 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:59618 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932519AbeGILMT (ORCPT ); Mon, 9 Jul 2018 07:12:19 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=9zNyfORn5Wnp9rnKXMIlabSpYrrvjClT/N7HaySK8M0=; b=ZvE7T1QPk1TRQ2pWOz8Q2ngWX afV/5XB/tz9DM82DbuGJSza8UpNG6jhqQdO1oYjrXME1MwBpBgoWhN1JlNmz4x8DZWD9Mpo/RwDR7 wfjUf6rxS9kq/bucbv7cfPHPFKG800hYMcCeKwWiEt3iJvHOePwzibadLTYi9XERV/qBiU/zrfzW+ PGKas55sAZDuJO5C2y50Oz1kb0Zh/U7S24A1VfyVcenTIVMHpN9mLSbvGtxZFrY2wIEqMEsM9ZdyL Yx4XseoQLGeG+XwKAbDcgUbxU83vYfYZmK/uXO2aRdEIwgOsflTCLOvkVl0CeWlpWzGR9HOM4hb7X adT25ZpIg==; Received: from [2001:8b0:10b:1::2fb] by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fcU5X-00023F-MG; Mon, 09 Jul 2018 11:12:15 +0000 Message-ID: <1531134735.18697.77.camel@infradead.org> Subject: Re: [RFC] Make need_resched() return true when rcu_urgent_qs requested From: David Woodhouse To: Peter Zijlstra Cc: "Paul E. McKenney" , mhillenb@amazon.de, linux-kernel In-Reply-To: <20180709110657.GL2476@hirez.programming.kicks-ass.net> References: <20180706162905.GZ2476@hirez.programming.kicks-ass.net> <20180706171150.GI3593@linux.vnet.ibm.com> <20180709085351.GC2476@hirez.programming.kicks-ass.net> <1531127935.18697.57.camel@infradead.org> <20180709104429.GI2476@hirez.programming.kicks-ass.net> <1531133801.18697.73.camel@infradead.org> <20180709110657.GL2476@hirez.programming.kicks-ass.net> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-5TEPE0GWLG5jBze+oAnz" Date: Mon, 09 Jul 2018 12:12:15 +0100 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-5TEPE0GWLG5jBze+oAnz Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-07-09 at 13:06 +0200, Peter Zijlstra wrote: > On Mon, Jul 09, 2018 at 11:56:41AM +0100, David Woodhouse wrote: >=20 > >=20 > > >=20 > > > But either proposal is exactly the same in this respect. The whole > > > rcu_urgent_qs thing won't be set any earlier either. > > Er.... Marius, our latencies in expand_fdtable() definitely went from > > ~10s to well below one second when we just added the rcu_all_qs() into > > the loop, didn't they? And that does nothing if !rcu_urgent_qs. > Argh I never found that, because obfuscation: >=20 > ruqp =3D per_cpu_ptr(&rcu_dynticks.rcu_urgent_qs, rdp->cpu); > ... > smp_store_release(ruqp, true); >=20 > I, using git grep "rcu_urgent_qs.*true" only found > rcu_request_urgent_qs_task() and sync_sched_exp_handler(). >=20 > But how come KVM even triggers that case; rcu_implicit_dynticks_qs() is > for NOHZ and offline CPUs. I don't know that it is; I'm merely going by the empirical observation that with a check for rcu_urgent_qs in the vcpu_run() loop, KVM is no longer screwing over synchronize_sched() for 10 seconds at a time. Or even 1 second at a time. I'm all for considering a CPU in guest mode to be quiescent, and not waiting for it at all. 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