linux-kernel - RE: [PATCH] proc: move the adding option Ngid to the end of proc/PID/status

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Date:	Fri, 17 Apr 2015 03:15:33 +0000
From:	"Wang, Xiaoming" <xiaoming.wang@...el.com>
To:	Tejun Heo <tj@...nel.org>
CC:	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"oleg@...hat.com" <oleg@...hat.com>,
	"andriy.shevchenko@...ux.intel.com" 
	<andriy.shevchenko@...ux.intel.com>,
	"linux@...musvillemoes.dk" <linux@...musvillemoes.dk>,
	"ebiederm@...ssion.com" <ebiederm@...ssion.com>,
	"eparis@...hat.com" <eparis@...hat.com>,
	"chenhanxiao@...fujitsu.com" <chenhanxiao@...fujitsu.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Schallberger, Timothy M" <timothy.m.schallberger@...el.com>,
	"Zhang, Dongxing" <dongxing.zhang@...el.com>
Subject: RE: [PATCH] proc: move the adding option Ngid to the end of
 proc/PID/status

Dear tejun

> -----Original Message-----
> From: Tejun Heo [mailto:htejun@...il.com] On Behalf Of Tejun Heo
> Sent: Friday, April 17, 2015 10:56 AM
> To: Wang, Xiaoming
> Cc: akpm@...ux-foundation.org; oleg@...hat.com;
> andriy.shevchenko@...ux.intel.com; linux@...musvillemoes.dk;
> ebiederm@...ssion.com; eparis@...hat.com; chenhanxiao@...fujitsu.com;
> tglx@...utronix.de; linux-kernel@...r.kernel.org; Schallberger, Timothy M;
> Zhang, Dongxing
> Subject: Re: [PATCH] proc: move the adding option Ngid to the end of
> proc/PID/status
> 
> On Fri, Apr 17, 2015 at 10:13:15AM +0800, Wang Xiaoming wrote:
> > Move debugging has been done and the following Kernel issue was found
> > with a number of applications.
> > Take a look at: (even though the comments are for Weibo.browser they
> > also pertain to other apps that use Libsecuritysdk-x.x.x.so
> >
> > In kernel(3.14) is a little different than before it will generate
> > /proc/PID/status in this way:
> > Name: a.weibo.browser
> > State: T (stopped)
> > Tgid: 8487
> > Ngid: 0     ---- add in kernel after (3.11 maybe)
> 
> Well, that's kinda hilarious and I don't know.  3.11 is way back and what if there
> are others depending on the current ordering?  Both situations kinda suck so
> what's the point of changing?
> 
I am not sure exactly which kernel introduced this Ngid.
I check the git and found it added in 
commit e29cf08b05dc0b8151d65704d96d525a9e179a6b
And this change has destroyed the order already.
Moving the adding option Ngid to the end of proc/PID/status
is to keep order .
> --
> tejun
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