linux-kernel - Re: [ofa-general] Re: [GIT PULL] please pull ummunotify

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Message-ID: <ada7hw0gsqz.fsf@cisco.com>
Date:	Tue, 15 Sep 2009 07:57:56 -0700
From:	Roland Dreier <rdreier@...co.com>
To:	Pavel Machek <pavel@....cz>
Cc:	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	general@...ts.openfabrics.org, akpm@...ux-foundation.org,
	torvalds@...ux-foundation.org
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify


 > I don't remember seeing discussion of this on lkml. Yes it  is in
 > -next...

eg http://lkml.org/lkml/2009/7/31/197 and followups, or search for v2
and earlier patches.

 > Basically it allows app to 'trace itself'? ...with interesting mmap()
 > interface, exporting int to userspace, hoping it behaves atomically...? 

Yes, it allows app to trace what the kernel does to memory mappings.  I
don't believe there's any real issue to atomicity of mmap'ed memory,
since userspace really just tests whether read value is == to old read
value or not.

 - R.
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