linux-kernel - Re: [PATCH v3 0/4] sched,time: fix irq time accounting with nohz

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Message-ID: <1467724144.17336.42.camel@redhat.com>
Date:	Tue, 05 Jul 2016 09:09:04 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Nikolay Borisov <kernel@...p.com>, linux-kernel@...r.kernel.org
Cc:	peterz@...radead.org, mingo@...nel.org, pbonzini@...hat.com,
	fweisbec@...hat.com, wanpeng.li@...mail.com, efault@....de,
	tglx@...utronix.de, rkrcmar@...hat.com
Subject: Re: [PATCH v3 0/4] sched,time: fix irq time accounting with
 nohz_idle

On Tue, 2016-07-05 at 16:02 +0300, Nikolay Borisov wrote:
> 
> On 06/30/2016 10:35 PM, riel@...hat.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
> > 
> > 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.
> 
> Is this supposed to alleviate the issue reported here:
> http://www.gossamer-threads.com/lists/linux/kernel/2169180

Indeed, it is.

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