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,URIBL_BLOCKED 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 2FB8AC5CFE7 for ; Wed, 11 Jul 2018 10:57:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id C14C22083C for ; Wed, 11 Jul 2018 10:57:50 +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="j4G+HUIl" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C14C22083C 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 S1732611AbeGKLBd (ORCPT ); Wed, 11 Jul 2018 07:01:33 -0400 Received: from twosheds.infradead.org ([90.155.92.209]:53596 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726641AbeGKLBd (ORCPT ); Wed, 11 Jul 2018 07:01:33 -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=3cyj8/vX4uAsmN+ae24XqQHmh4DgjubNn1UmMTL11zs=; b=j4G+HUIlup5QxZGNpLnNZYi6u OGVgM3R4PeNh+bnK/3JLjXNYZp8/Ii9kiqXVkPY+v76uj8ISfNvEVewkHshImrc4Grj3QLFbM4i1y kc6KYip/YiQia13Ut2/eUJJlpQCX3qyoyn5fsjW9rhDnDi78IrvwpKr67TTyyAGqR9EG+RnMWhkzy IPhbE0mLLTdPTyU3WHU8M+W1N1Ojv31Gb1cwq7JZiY8UdDczBp30I+vfs0UMEdVctO795EB8/2syZ dknyaEtUUiHsEhDXerWyQLvAY82hVjhd4+hA5xat87HQbazDFLkowpXZf0OqOftfs7wDewWM264E9 2sCw14hnQ==; Received: from [2001:8b0:10b:1::2fb] by twosheds.infradead.org with esmtpsa (Exim 4.90_1 #2 (Red Hat Linux)) id 1fdCoa-0004W7-Jt; Wed, 11 Jul 2018 10:57:44 +0000 Message-ID: <1531306663.8759.39.camel@infradead.org> Subject: Re: [RFC] Make need_resched() return true when rcu_urgent_qs requested From: David Woodhouse To: paulmck@linux.vnet.ibm.com Cc: Peter Zijlstra , linux-kernel , "Hillenbrand, Marius" In-Reply-To: <20180709220823.GA18045@linux.vnet.ibm.com> References: <20180709130227.GQ2512@hirez.programming.kicks-ass.net> <20180709142932.GO3593@linux.vnet.ibm.com> <20180709152632.GX2476@hirez.programming.kicks-ass.net> <20180709163432.GV3593@linux.vnet.ibm.com> <1531162254.26547.3.camel@infradead.org> <20180709203441.GE3593@linux.vnet.ibm.com> <1531168538.26547.5.camel@infradead.org> <20180709204248.GF3593@linux.vnet.ibm.com> <1531169145.26547.8.camel@infradead.org> <20180709210532.GH3593@linux.vnet.ibm.com> <20180709220823.GA18045@linux.vnet.ibm.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-JbsWyrneXOtk/KA4bo45" Date: Wed, 11 Jul 2018 11:57:43 +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 --=-JbsWyrneXOtk/KA4bo45 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2018-07-09 at 15:08 -0700, Paul E. McKenney wrote: >=20 > And the earlier patch was against my -rcu tree, which won't be all that > helpful for v4.15.=C2=A0 Please see below for a lightly tested backport t= o v4.15. >=20 > It should apply to all the releases of interest.=C2=A0 If other backports > are needed, please remind me of my woodhouse.v4.15.2018.07.09a tag. >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Thanx, Paul >=20 > ------------------------------------------------------------------------ >=20 > commit 6361b81827a8f93f582124da385258fc04a38a7f > Author: Paul E. McKenney > Date:=C2=A0=C2=A0 Mon Jul 9 13:47:30 2018 -0700 >=20 > =C2=A0=C2=A0=C2=A0 rcu: Make need_resched() respond to urgent RCU-QS need= s > =C2=A0=C2=A0=C2=A0=C2=A0 > =C2=A0=C2=A0=C2=A0 The per-CPU rcu_dynticks.rcu_urgent_qs variable commun= icates an urgent > =C2=A0=C2=A0=C2=A0 need for an RCU quiescent state from the force-quiesce= nt-state processing > =C2=A0=C2=A0=C2=A0 within the grace-period kthread to context switches an= d to cond_resched(). > =C2=A0=C2=A0=C2=A0 Unfortunately, such urgent needs are not communicated = to need_resched(), > =C2=A0=C2=A0=C2=A0 which is sometimes used to decide when to invoke cond_= resched(), for > =C2=A0=C2=A0=C2=A0 but one example, within the KVM vcpu_run() function.= =C2=A0 As of v4.15, this > =C2=A0=C2=A0=C2=A0 can result in synchronize_sched() being delayed by up = to ten seconds, > =C2=A0=C2=A0=C2=A0 which can be problematic, to say nothing of annoying. > =C2=A0=C2=A0=C2=A0=C2=A0 > =C2=A0=C2=A0=C2=A0 This commit therefore checks rcu_dynticks.rcu_urgent_q= s from within > =C2=A0=C2=A0=C2=A0 rcu_check_callbacks(), which is invoked from the sched= uling-clock > =C2=A0=C2=A0=C2=A0 interrupt handler.=C2=A0 If the current task is not an= idle task and is > =C2=A0=C2=A0=C2=A0 not executing in usermode, a context switch is forced,= and either way, > =C2=A0=C2=A0=C2=A0 the rcu_dynticks.rcu_urgent_qs variable is set to fals= e.=C2=A0 If the current > =C2=A0=C2=A0=C2=A0 task is an idle task, then RCU's dyntick-idle code wil= l detect the > =C2=A0=C2=A0=C2=A0 quiescent state, so no further action is required.=C2= =A0 Similarly, if the > =C2=A0=C2=A0=C2=A0 task is executing in usermode, other code in rcu_check= _callbacks() and > =C2=A0=C2=A0=C2=A0 its called functions will report the corresponding qui= escent state. > =C2=A0=C2=A0=C2=A0=C2=A0 > =C2=A0=C2=A0=C2=A0 Reported-by: David Woodhouse > =C2=A0=C2=A0=C2=A0 Suggested-by: Peter Zijlstra > =C2=A0=C2=A0=C2=A0 Signed-off-by: Paul E. McKenney > =C2=A0=C2=A0=C2=A0 [ paulmck: Backported to v4.15.=C2=A0 Probably applies= elsewhere. ] Hm, this doesn't appear to work. I'm still seeing latencies of 4-5 seconds in my testing. In fact, even our old workaround of adding rcu_all_qs() into vcpu_enter_guest() didn't properly fix it AFAICT. I'm just creating a VM with lots of CPUs, then attaching new devices to it to cause the VMM to open more file descriptors, until it hits a power of two and invokes expand_fdtable(). expand_fdtable (512) sync took 10472394964 cycles (3500000 =C2=B5s). expand_fdtable (512) sync took 15298908072 cycles (5100000 =C2=B5s). --- a/fs/file.c +++ b/fs/file.c @@ -162,8 +162,16 @@ static int expand_fdtable(struct files_struct *files, = unsigned int nr) =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0/* make sure all __fd_insta= ll() have seen resize_in_progress =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0* or have finished th= eir rcu_read_lock_sched() section. =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*/ -=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (atomic_read(&files->count) >= 1) +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (atomic_read(&files->count) >= 1) { +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0unsigned long sync_start, sync_end; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0unsigned long j_start, j_end; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0j_start =3D jiffies; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0sync_start =3D get_cycles(); =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0synchronize_sched(); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0sync_end =3D get_cycles(); +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0j_end =3D jiffies; +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0printk("expand_fdtable (%d) sync took %ld cycles (%ld =C2= =B5s).\n", nr, sync_end - sync_start, jiffies_to_usecs(j_end - j_start)); 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