From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755157AbcGENJh (ORCPT ); Tue, 5 Jul 2016 09:09:37 -0400 Received: from mx1.redhat.com ([209.132.183.28]:48137 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752050AbcGENJI (ORCPT ); Tue, 5 Jul 2016 09:09:08 -0400 Message-ID: <1467724144.17336.42.camel@redhat.com> Subject: Re: [PATCH v3 0/4] sched,time: fix irq time accounting with nohz_idle From: Rik van Riel To: Nikolay Borisov , linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@kernel.org, pbonzini@redhat.com, fweisbec@redhat.com, wanpeng.li@hotmail.com, efault@gmx.de, tglx@linutronix.de, rkrcmar@redhat.com Date: Tue, 05 Jul 2016 09:09:04 -0400 In-Reply-To: <577BAFF1.6080806@kyup.com> References: <1467315350-3152-1-git-send-email-riel@redhat.com> <577BAFF1.6080806@kyup.com> Content-Type: multipart/signed; micalg="pgp-sha256"; protocol="application/pgp-signature"; boundary="=-TBMsO/WeYySmR4x3JdMH" Mime-Version: 1.0 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.25]); Tue, 05 Jul 2016 13:09:07 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-TBMsO/WeYySmR4x3JdMH Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2016-07-05 at 16:02 +0300, Nikolay Borisov wrote: >=20 > On 06/30/2016 10:35 PM, riel@redhat.com wrote: > > Currently irq time accounting only works in these cases: > > 1) purely ticke based accounting > > 2) nohz_full accounting, but only on housekeeping & nohz_full CPUs > > 3) architectures with native vtime accounting > >=20 > > On nohz_idle CPUs, which are probably the majority nowadays, > > irq time accounting is currently broken. This leads to systems > > reporting a dramatically lower amount of irq & softirq time than > > is actually spent handling them, with all the time spent while the > > system is in the idle task being accounted as idle. >=20 > Is this supposed to alleviate the issue reported here: > http://www.gossamer-threads.com/lists/linux/kernel/2169180 Indeed, it is. --=20 All Rights Reversed. --=-TBMsO/WeYySmR4x3JdMH Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- Version: GnuPG v2 iQEcBAABCAAGBQJXe7FwAAoJEM553pKExN6DhMoIAIo92a+/zqT7LCZasfsYKIAy ZY+hetUmMZLUs1Y6QgRlKKiE1mWcgdlaDZ6KV7ocw6VwQZnlAAQOVtomPO59qqM/ wsmJlL+LsnzOzSZFcV34loyIWAcIjrGrIcuNOKLV1P3RIMP+wSxtf4BN1/q5GcrJ DbG9EtLYP/Nq1eK3bcrues6Jp++F9NIwQbzyvvTO6gApM1otMzGSwYjo4HTG+Xpb gCUiqDMMVm70874pHJpsKM79lV6p7BHA1QHDTFDyKvwOUD3qylVV9NumzEPvc877 3VyAjzAZ6k0mpvlpvOL2uXgXFiydLjZzBXAj0QfUgD/ePnvxbVMS2Qew1MmxRz0= =kRCe -----END PGP SIGNATURE----- --=-TBMsO/WeYySmR4x3JdMH--