From: Christoffer Dall <christoffer.dall@linaro.org>
To: Mario Smarduch <m.smarduch@samsung.com>
Cc: Russell King - ARM Linux <linux@arm.linux.org.uk>,
Marc Zyngier <Marc.Zyngier@arm.com>,
Catalin Marinas <catalin.marinas@arm.com>,
Will Deacon <will.deacon@arm.com>,
"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, 2 Dec 2015 19:07:41 +0100 [thread overview]
Message-ID: <20151202180741.GR18376@cbox> (raw)
In-Reply-To: <564D31D3.5040207@samsung.com>
Hi Mario,
On Wed, Nov 18, 2015 at 06:20:03PM -0800, Mario Smarduch wrote:
> 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?
> >
Is any of this related to KVM?
-Christoffer
WARNING: multiple messages have this Message-ID (diff)
From: christoffer.dall@linaro.org (Christoffer Dall)
To: linux-arm-kernel@lists.infradead.org
Subject: arm64 sched_clock cpu accounting
Date: Wed, 2 Dec 2015 19:07:41 +0100 [thread overview]
Message-ID: <20151202180741.GR18376@cbox> (raw)
In-Reply-To: <564D31D3.5040207@samsung.com>
Hi Mario,
On Wed, Nov 18, 2015 at 06:20:03PM -0800, Mario Smarduch wrote:
> 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?
> >
Is any of this related to KVM?
-Christoffer
next prev parent reply other threads:[~2015-12-02 18:05 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
2015-11-19 2:20 ` Mario Smarduch
2015-12-02 18:07 ` Christoffer Dall [this message]
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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