From mboxrd@z Thu Jan 1 00:00:00 1970 From: Mario Smarduch Subject: Re: arm64 sched_clock cpu accounting Date: Wed, 18 Nov 2015 18:20:03 -0800 Message-ID: <564D31D3.5040207@samsung.com> References: <564CD5A7.8000007@samsung.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id F227240F9B for ; Wed, 18 Nov 2015 21:19:29 -0500 (EST) Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id B03dANqw5ivF for ; Wed, 18 Nov 2015 21:19:28 -0500 (EST) Received: from usmailout3.samsung.com (mailout3.w2.samsung.com [211.189.100.13]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 39525497BE for ; Wed, 18 Nov 2015 21:19:27 -0500 (EST) Received: from uscpsbgex3.samsung.com (u124.gpu85.samsung.co.kr [203.254.195.124]) by usmailout3.samsung.com (Oracle Communications Messaging Server 7.0.5.31.0 64bit (built May 5 2014)) with ESMTP id <0NY10023HIHG3L90@usmailout3.samsung.com> for kvmarm@lists.cs.columbia.edu; Wed, 18 Nov 2015 21:20:05 -0500 (EST) In-reply-to: <564CD5A7.8000007@samsung.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu To: Catalin Marinas Cc: Marc Zyngier , Will Deacon , Russell King - ARM Linux , "kvmarm@lists.cs.columbia.edu" , "linux-arm-kernel@lists.infradead.org" List-Id: kvmarm@lists.cs.columbia.edu Also with tick accounting enabled, and periodic timer HZ set to 1000 no irq time is reported. That's with running a ping flood - 1200 int/s, not sure why wouldn't any irq time be reported? The other two modes report irq time as expected. On 11/18/2015 11:46 AM, Mario Smarduch wrote: > Hello, > I noticed sched clock accounting can be enabled when arch-timer is > initialized. But arm64 doesn't appear to have 'HAVE_IRQ_TIME_ACCOUNTING' > selected (as of mainline 4.4-rc1) and IRQ_TIME_ACCOUNTING can't be selected. > After adding it to arch/arm64/Kconfig, option appears to work fine. Depending on > need all accounting options are fine, but irq time accounting appears to be most > preferable. > > Any thoughts? Is it fine to enable it? > > Thanks, > Mario > > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm > From mboxrd@z Thu Jan 1 00:00:00 1970 From: m.smarduch@samsung.com (Mario Smarduch) Date: Wed, 18 Nov 2015 18:20:03 -0800 Subject: arm64 sched_clock cpu accounting In-Reply-To: <564CD5A7.8000007@samsung.com> References: <564CD5A7.8000007@samsung.com> Message-ID: <564D31D3.5040207@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Also with tick accounting enabled, and periodic timer HZ set to 1000 no irq time is reported. That's with running a ping flood - 1200 int/s, not sure why wouldn't any irq time be reported? The other two modes report irq time as expected. On 11/18/2015 11:46 AM, Mario Smarduch wrote: > Hello, > I noticed sched clock accounting can be enabled when arch-timer is > initialized. But arm64 doesn't appear to have 'HAVE_IRQ_TIME_ACCOUNTING' > selected (as of mainline 4.4-rc1) and IRQ_TIME_ACCOUNTING can't be selected. > After adding it to arch/arm64/Kconfig, option appears to work fine. Depending on > need all accounting options are fine, but irq time accounting appears to be most > preferable. > > Any thoughts? Is it fine to enable it? > > Thanks, > Mario > > > _______________________________________________ > kvmarm mailing list > kvmarm at lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm >