linux-kernel - Re: [PATCH v4 0/5] Enabling the asynchronous threads for other phases

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Message-ID: <4216593.WbzE5aJO7L@vostro.rjw.lan>
Date:	Fri, 21 Feb 2014 17:43:33 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	"Liu, Chuansheng" <chuansheng.liu@...el.com>
Cc:	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"Brown, Len" <len.brown@...el.com>, "pavel@....cz" <pavel@....cz>,
	"linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Li, Zhuangzhi" <zhuangzhi.li@...el.com>
Subject: Re: [PATCH v4 0/5] Enabling the asynchronous threads for other phases

On Friday, February 21, 2014 01:38:45 AM Liu, Chuansheng wrote:
> Hello Rafael,
> 
> > -----Original Message-----
> > From: Liu, Chuansheng
> > Sent: Tuesday, February 18, 2014 10:29 AM
> > To: rjw@...ysocki.net; gregkh@...uxfoundation.org; Brown, Len;
> > pavel@....cz
> > Cc: linux-pm@...r.kernel.org; linux-kernel@...r.kernel.org; Li, Zhuangzhi; Liu,
> > Chuansheng
> > Subject: [PATCH v4 0/5] Enabling the asynchronous threads for other phases
> > 
> > Hello,
> > 
> > This patch series are for enabling the asynchronous threads for the phases
> > resume_noirq, resume_early, suspend_noirq and suspend_late.
> > 
> 
> After dig more about async threads, I found dpm_prepare/complete phases need
> them also.
> 
> dpm_prepare()
>   -- > call pci_pm_prepare() one by one
>       -- > call pm_runtime_resume() one by one
>         -- > call pci_set_power_state to D3HOT -- > D0
> 
> It will cause much time delaying due to d3_delay.
> And I made one draft patch to implement the asynchronous threads for dpm_prepare(),
> it is really save much time.
> 
> If you like it, I can prepare another series patches for dpm_prepare() and dpm_complete(),
> thanks.

I think a better solution here would be to move the pm_runtime_resume()
out of the .prepare() callback for PCI.  We may be doing that in the
process of suspend optimization anyway, so I'd wait with making those
phases async.

Thanks!

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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