linux-kernel - Re: [PATCH 1/2] mm: Export vm_committed

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Message-ID: <alpine.DEB.2.00.1211081413350.20544@chino.kir.corp.google.com>
Date:	Thu, 8 Nov 2012 14:14:35 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
cc:	KY Srinivasan <kys@...rosoft.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"apw@...onical.com" <apw@...onical.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Hiroyuki Kamezawa <kamezawa.hiroyuki@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>,
	Ying Han <yinghan@...gle.com>
Subject: Re: [PATCH 1/2] mm: Export vm_committed_as

On Thu, 8 Nov 2012, Andrew Morton wrote:

> > > I don't think you should export the symbol itself to modules but rather a
> > > helper function that returns s64 that just wraps
> > > percpu_counter_read_positive() which your driver could use instead.
> > > 
> > > (And why percpu_counter_read_positive() returns a signed type is a
> > > mystery.)
> > 
> > Yes, this makes sense. I just want to access (read) this metric. Andrew, if you are willing to
> > take this patch, I could send one.
> 
> Sure.  I suppose that's better, although any module which modifies
> committed_as would never pass review (rofl).
> 

I was thinking of a function that all hypervisors can use (since xen also 
uses it) that can be well documented and maintain the semantics that they 
expect, whether that relines on vm_commited_as in the future or not.
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