linux-kernel - Re: [PATCH 3/6] ksm: change the KSM_REMOVE_MEMORY

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Date:	Wed, 6 May 2009 09:49:45 -0700
From:	Chris Wright <chrisw@...hat.com>
To:	Hugh Dickins <hugh@...itas.com>
Cc:	Izik Eidus <ieidus@...hat.com>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, chrisw@...hat.com,
	alan@...rguk.ukuu.org.uk, device@...ana.org, linux-mm@...ck.org,
	nickpiggin@...oo.com.au
Subject: Re: [PATCH 3/6] ksm: change the KSM_REMOVE_MEMORY_REGION ioctl.

* Hugh Dickins (hugh@...itas.com) wrote:
> On Wed, 6 May 2009, Izik Eidus wrote:
> > Andrea Arcangeli wrote:
> > > On Wed, May 06, 2009 at 12:16:52PM +0100, Hugh Dickins wrote:
> > >   
> > >
> > > > p.s.  I wish you'd chosen different name than KSM - the kernel
> > > > has supported shared memory for many years - and notice ksm.c itself
> > > > says "Memory merging driver".  "Merge" would indeed have been a less
> > > > ambiguous term than "Share", but I think too late to change that now
> > > > - except possibly in the MADV_ flag names?
> > > >     
> > >
> > > I don't actually care about names, so I leave this to other to discuss.
> > >   
> > Well, There is no real problem changing the name, any suggestions?
> 
> mm/merge.c or mm/mmerge.c: the module formerly known as KSM ?

I like merge.  For madvise() approach I had used:

+#define MADV_SHAREABLE 12              /* can share identical pages */
+#define MADV_UNSHAREABLE 13            /* can not share identical pages

But those are maybe better put as MADV_(UN)MERGEABLE (gets a bit confusing when
you talk of merging vmas ;-)
*/

thanks,
-chris
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