linux-kernel - Re: [nohz] 2a16fc93d2c: kernel lockup on idle injection

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Message-ID: <CAKohpokZCK3TAZx1mwo3zLxugkxg-h7MAXkTxA4LVWausufDYg@mail.gmail.com>
Date:	Tue, 16 Dec 2014 09:48:42 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	"Pan, Jacob jun" <jacob.jun.pan@...el.com>
Cc:	Preeti U Murthy <preeti@...ux.vnet.ibm.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Wu, Fengguang" <fengguang.wu@...el.com>,
	Frederic Weisbecker <frederic@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>, LKP <lkp@...org>,
	"Jacob Pan (jacob.jun.pan@...ux.intel.com)" 
	<jacob.jun.pan@...ux.intel.com>,
	"Zijlstra, Peter" <peter.zijlstra@...el.com>
Subject: Re: [nohz] 2a16fc93d2c: kernel lockup on idle injection

On 16 December 2014 at 02:54, Pan, Jacob jun <jacob.jun.pan@...el.com> wrote:

> Looks good to me. You can add my Reviewed-by to the above patch.

Thanks.

> I have tested this fix and confirm powerclamp is working properly now.

Oh, nice.

> However, we also have a planned patch for consolidated idle loop. With this patch it causes some erratic behavior in idle injection.
> I can’t seem to synchronize/align idle time around jiffies with this patch + fix.
>
> Any suggestions welcome.
> https://lkml.org/lkml/2014/6/4/56

And all works fine without this patch ?
2a16fc93d2c9 ("nohz: Avoid tick's double reprogramming in highres mode")

I really don't know what stuff out of the two patches I posted (The above one
and the fix I posted yesterday), will possible make the synchronization bad ..

--
viresh
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