linux-kernel - Re: [PATCH for -mm] getrusage: fill ru

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Message-Id: <20090617132118.ef839ad7.akpm@linux-foundation.org>
Date:	Wed, 17 Jun 2009 13:21:18 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	kosaki.motohiro@...fujitsu.com, jpirko@...hat.com,
	linux-kernel@...r.kernel.org, oleg@...hat.com, linux-mm@...ck.org,
	mingo@...e.hu
Subject: Re: [PATCH for -mm] getrusage: fill ru_maxrss value

On Mon, 6 Apr 2009 08:22:07 +0100 (BST)
Hugh Dickins <hugh@...itas.com> wrote:

> On Mon, 6 Apr 2009, KOSAKI Motohiro wrote:
> > 
> > > I'm worrying particularly about the fork/exec issue you highlight.
> > > You're exemplary in providing your test programs, but there's a big
> > > omission: you don't mention that the first test, "./getrusage -lc",
> > > gives a very different result on Linux than you say it does on BSD -
> > > you say the BSD fork line is "fork: self 0 children 0", whereas
> > > I find my Linux fork line is "fork: self 102636 children 0".
> > 
> > FreeBSD update rusage at tick updating point. (I think all bsd do that)
> > Then, bsd displaing 0 is bsd's problem :)
> 
> Ah, thank you.
> 
> > 
> > Do I must change test program?
> 
> Apparently somebody needs to, please; though it appears to be already
> well supplied with usleep(1)s - maybe they needed to be usleep(2)s?
> 
> And then change results shown in the changelog, and check conclusions
> drawn from them (if BSD is behaving as we do, it should still show
> maxrss not inherited over fork, but less obviously - the number goes
> down slightly, because the history is lost, but nowhere near to zero).
> 

afaik none of this happened, so I have the patch on hold.
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