linux-kernel - Re: [PATCH 5/4] update ksm userspace interfaces

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Message-ID: <20090402152045.GB10392@x200.localdomain>
Date:	Thu, 2 Apr 2009 08:20:45 -0700
From:	Chris Wright <chrisw@...hat.com>
To:	Izik Eidus <ieidus@...hat.com>
Cc:	Chris Wright <chrisw@...hat.com>,
	Anthony Liguori <anthony@...emonkey.ws>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	linux-mm@...ck.org, avi@...hat.com, riel@...hat.com,
	jeremy@...p.org, mtosatti@...hat.com, hugh@...itas.com,
	corbet@....net, yaniv@...hat.com, dmonakhov@...nvz.org
Subject: Re: [PATCH 5/4] update ksm userspace interfaces

* Izik Eidus (ieidus@...hat.com) wrote:
> So if we move into madvice and we remove the get_task_mm() usage, we  
> will have to add notification to exit_mm() so ksm will know it should  
> stop using this mm strcture, and drop it from all the trees data...

Technically it's needed already.  This example is currently semi-broken:

main()
 ksm_register_memory
 execve()   <-- no notifiction unless fd is proactively marked cloexec
                (which it isn't)

   new proc...do stuff (it's ->mm isn't registered)
   eventually exit() <-- close fd and clear up the old stale ->mm registered
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