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From: Mario Smarduch <m.smarduch@samsung.com>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: Marc Zyngier <Marc.Zyngier@arm.com>,
	Will Deacon <will.deacon@arm.com>,
	Russell King - ARM Linux <linux@arm.linux.org.uk>,
	"kvmarm@lists.cs.columbia.edu" <kvmarm@lists.cs.columbia.edu>,
	"linux-arm-kernel@lists.infradead.org"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: arm64 sched_clock cpu accounting
Date: Wed, 18 Nov 2015 18:20:03 -0800	[thread overview]
Message-ID: <564D31D3.5040207@samsung.com> (raw)
In-Reply-To: <564CD5A7.8000007@samsung.com>

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
> 

WARNING: multiple messages have this Message-ID (diff)
From: m.smarduch@samsung.com (Mario Smarduch)
To: linux-arm-kernel@lists.infradead.org
Subject: arm64 sched_clock cpu accounting
Date: Wed, 18 Nov 2015 18:20:03 -0800	[thread overview]
Message-ID: <564D31D3.5040207@samsung.com> (raw)
In-Reply-To: <564CD5A7.8000007@samsung.com>

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
> 

  reply	other threads:[~2015-11-19  2:19 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-11-18 19:46 arm64 sched_clock cpu accounting Mario Smarduch
2015-11-18 19:46 ` Mario Smarduch
2015-11-19  2:20 ` Mario Smarduch [this message]
2015-11-19  2:20   ` Mario Smarduch
2015-12-02 18:07   ` Christoffer Dall
2015-12-02 18:07     ` Christoffer Dall
2015-12-02 23:42     ` Mario Smarduch
2015-12-02 23:42       ` Mario Smarduch
2015-12-03  9:29       ` Will Deacon
2015-12-03  9:29         ` Will Deacon
2015-12-03 18:26         ` Mario Smarduch
2015-12-03 18:26           ` Mario Smarduch
2015-12-03 18:45       ` Mario Smarduch
2015-12-03 18:45         ` Mario Smarduch

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