linux-kernel - Re: [PATCH] PM-Trace: add pm-trace support for suspending phase

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Message-ID: <54DC3086.5030603@linux.intel.com>
Date:	Thu, 12 Feb 2015 12:48:06 +0800
From:	"Fu, Zhonghui" <zhonghui.fu@...ux.intel.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
CC:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, pavel@....cz,
	len.brown@...el.com, linux-pm@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] PM-Trace: add pm-trace support for suspending phase


On 2015/2/11 23:25, Rafael J. Wysocki wrote:
> On Wednesday, February 11, 2015 10:43:13 PM Fu, Zhonghui wrote:
>> From 2626594c03ca3b9884dd44073385c36f99a3651d Mon Sep 17 00:00:00 2001
>> From: Zhonghui Fu <zhonghui.fu@...ux.intel.com>
>> Date: Wed, 11 Feb 2015 16:20:21 +0800
>> Subject: [PATCH] PM-Trace: add pm-trace support for suspending phase
> Can you please avoid putting the above header lines into your patches?
>
> The only one that may be necessary is the From: line, but that's only
> needed if you submit from a different address.
>
> Also please don't send To: mailing lists.  Use CC instead.  In fact, there
> should be *one* address in the To: field when you're submitting a patch:
> The address of the maintainer you want to apply the patch for you.
Thanks for your guidance, and I will re-send this patch.

>
>> Occasionally, the system can't come back up after suspend/resume
>> due to problems of device suspending phase. This patch make
>> PM_TRACE infrastructure cover device suspending phase of
>> suspend/resume process, and the information in RTC can tell
>> developers which device suspending function make system hang.
> Do you have any examples of when this helped and no other debug methods did?
>
> It seems odd to me that no one has ever asked for this for several years and
> now you need it.
We ever run into some system hang during suspending some devices on BayTrail-T platform such as DMA, audio, etc. So, extending PM-Trace to suspend phase should be helpful.

Thanks,
Zhonghui
>
>

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