From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>,
mikey@neuling.org, linux-pm@vger.kernel.org, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] cpuidle/powernv: Enter fastsleep on checking if deep idle states are allowed
Date: Mon, 15 Sep 2014 08:23:16 -0400 [thread overview]
Message-ID: <1410783796.31754.85.camel@pasglop> (raw)
In-Reply-To: <5416A8B0.8040603@linux.vnet.ibm.com>
On Mon, 2014-09-15 at 14:22 +0530, Preeti U Murthy wrote:
> > We were talking about getting rid of powersave_nap altogether, but I
> think we
> > decided we couldn't, I forget.
>
> Isn't this a helpful knob to disable cpuidle at runtime? Currently we
> check the value of powersave_nap before entering both nap and
> fastsleep.
It's useful when diagnosing some problems that can be caused by idle
states.
Cheers,
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: mikey@neuling.org, linux-pm@vger.kernel.org, rjw@rjwysocki.net,
linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] cpuidle/powernv: Enter fastsleep on checking if deep idle states are allowed
Date: Mon, 15 Sep 2014 08:23:16 -0400 [thread overview]
Message-ID: <1410783796.31754.85.camel@pasglop> (raw)
In-Reply-To: <5416A8B0.8040603@linux.vnet.ibm.com>
On Mon, 2014-09-15 at 14:22 +0530, Preeti U Murthy wrote:
> > We were talking about getting rid of powersave_nap altogether, but I
> think we
> > decided we couldn't, I forget.
>
> Isn't this a helpful knob to disable cpuidle at runtime? Currently we
> check the value of powersave_nap before entering both nap and
> fastsleep.
It's useful when diagnosing some problems that can be caused by idle
states.
Cheers,
Ben.
next prev parent reply other threads:[~2014-09-15 12:23 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-12 11:01 [PATCH] cpuidle/powernv: Enter fastsleep on checking if deep idle states are allowed Preeti U Murthy
2014-09-15 6:59 ` Michael Ellerman
2014-09-15 6:59 ` Michael Ellerman
2014-09-15 8:52 ` Preeti U Murthy
2014-09-15 8:52 ` Preeti U Murthy
2014-09-15 12:23 ` Benjamin Herrenschmidt [this message]
2014-09-15 12:23 ` Benjamin Herrenschmidt
2015-01-30 5:41 ` Preeti U Murthy
2015-01-30 5:41 ` Preeti U Murthy
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