linux-kernel - Re: [RFC][PATCH 0/6] more detailed per-process transparent hugepage statistics

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Message-ID: <alpine.DEB.2.00.1102031354340.1307@chino.kir.corp.google.com>
Date:	Thu, 3 Feb 2011 13:54:56 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...ux.vnet.ibm.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Michael J Wolf <mjwolf@...ibm.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC][PATCH 0/6] more detailed per-process transparent hugepage
 statistics

On Mon, 31 Jan 2011, Dave Hansen wrote:

> I'm working on some more reports that transparent huge pages and
> KSM do not play nicely together.  Basically, whenever THP's are
> present along with KSM, there is a lot of attrition over time,
> and we do not see much overall progress keeping THP's around:
> 
> 	http://sr71.net/~dave/ibm/038_System_Anonymous_Pages.png
> 
> (That's Karl Rister's graph, thanks Karl!)
> 
> However, I realized that we do not currently have a nice way to
> find out where individual THP's might be on the system.  We
> have an overall count, but no way of telling which processes or
> VMAs they might be in.
> 
> I started to implement this in the /proc/$pid/smaps code, but
> quickly realized that the lib/pagewalk.c code unconditionally
> splits THPs up.  This set reworks that code a bit and, in the
> end, gives you a per-map count of the numbers of huge pages.
> It also makes it possible for page walks to _not_ split THPs.
> 

Nice!  I'd like to start using this patchset immediately, I'm hoping 
you'll re-propose it with the fixes soon.

Thanks Dave.
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