linux-kernel - Re: [RFC PATCH v2 2/2] mm: tuning hardcoded reserved memory

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Message-ID: <20130228021950.GA3829@localhost.localdomain>
Date:	Wed, 27 Feb 2013 21:19:50 -0500
From:	Andrew Shewmaker <agshew@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v2 2/2] mm: tuning hardcoded reserved memory

On Thu, Feb 28, 2013 at 02:14:41PM -0800, Andrew Morton wrote:
> On Wed, 27 Feb 2013 16:09:25 -0500
> Andrew Shewmaker <agshew@...il.com> wrote:
> 
> > Add a rootuser_reserve_pages knob to allow admins of large memory 
> > systems running with overcommit disabled to change the hardcoded 
> > memory reserve to something other than 3%.
> > 
> > Signed-off-by: Andrew Shewmaker <agshew@...il.com>
> > 
> > ---
> > 
> > Patch based off of mmotm git tree as of February 27th.
> > 
> > I set rootuser_reserve pages to be a default of 1000, and I suppose 
> > I should have initialzed similarly to the way min_free_kbytes is, 
> > scaling it with the size of the box. However, I wanted to get a 
> > simple version of this patch out for feedback to see if it has any 
> > chance of acceptance or if I need to take an entirely different 
> > approach.
> > 
> > Any feedback will be appreciated!
> 
> Seems reasonable.
> 
> Yes, we should scale the initial value according to the machine size in
> some fashion.
> 
> btw, both these patches had the same title.  Please avoid this.
> Documentation/SubmittingPatches section 15 has all the details.

Sorry about that. I'll resend correctly formatted patche submissions 
with a scaled initial value for rootuser_reserve_pages.

Thanks for the feedback!
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