From: Pavel Machek <pavel-+ZI9xUNit7I@public.gmane.org>
To: Roland Dreier <rdreier-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
Cc: linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
general-ZwoEplunGu1OwGhvXhtEPSCwEArCW2h5@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify
Date: Mon, 28 Sep 2009 22:49:23 +0200 [thread overview]
Message-ID: <20090928204923.GA1960@elf.ucw.cz> (raw)
In-Reply-To: <ada7hw0gsqz.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
On Tue 2009-09-15 07:57:56, Roland Dreier wrote:
>
> > 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.
Well... it seems little overspecialized. Just modifying libc to
provide hooks you want looks like better solution.
> > 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.
That still needs memory barriers etc.. to ensure reliable operation,
no?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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WARNING: multiple messages have this Message-ID (diff)
From: Pavel Machek <pavel@ucw.cz>
To: Roland Dreier <rdreier@cisco.com>
Cc: linux-rdma@vger.kernel.org, linux-kernel@vger.kernel.org,
general@lists.openfabrics.org, akpm@linux-foundation.org,
torvalds@linux-foundation.org
Subject: Re: [ofa-general] Re: [GIT PULL] please pull ummunotify
Date: Mon, 28 Sep 2009 22:49:23 +0200 [thread overview]
Message-ID: <20090928204923.GA1960@elf.ucw.cz> (raw)
In-Reply-To: <ada7hw0gsqz.fsf@cisco.com>
On Tue 2009-09-15 07:57:56, Roland Dreier wrote:
>
> > 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.
Well... it seems little overspecialized. Just modifying libc to
provide hooks you want looks like better solution.
> > 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.
That still needs memory barriers etc.. to ensure reliable operation,
no?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2009-09-28 20:49 UTC|newest]
Thread overview: 82+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-11 4:38 [GIT PULL] please pull ummunotify Roland Dreier
2009-09-11 4:38 ` Roland Dreier
2009-09-15 11:34 ` Pavel Machek
[not found] ` <20090915113434.GF1328-+ZI9xUNit7I@public.gmane.org>
2009-09-15 14:57 ` [ofa-general] " Roland Dreier
2009-09-15 14:57 ` Roland Dreier
[not found] ` <ada7hw0gsqz.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-28 20:49 ` Pavel Machek [this message]
2009-09-28 20:49 ` Pavel Machek
[not found] ` <20090928204923.GA1960-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2009-09-28 21:40 ` Jason Gunthorpe
2009-09-28 21:40 ` Jason Gunthorpe
[not found] ` <aday6omhz9d.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-11 5:56 ` KOSAKI Motohiro
2009-09-11 5:56 ` KOSAKI Motohiro
2009-09-11 6:03 ` [ofa-general] " Roland Dreier
2009-09-11 6:03 ` Roland Dreier
[not found] ` <adatyzahvbm.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-11 6:11 ` KOSAKI Motohiro
2009-09-11 6:11 ` KOSAKI Motohiro
[not found] ` <20090911150552.DB68.A69D9226-+CUm20s59erQFUHtdCDX3A@public.gmane.org>
2009-09-11 16:42 ` Gleb Natapov
2009-09-11 16:42 ` Gleb Natapov
2009-09-11 6:15 ` Brice Goglin
[not found] ` <4AA9EAF7.5010401-MZpvjPyXg2s@public.gmane.org>
2009-09-11 6:21 ` KOSAKI Motohiro
2009-09-11 6:21 ` KOSAKI Motohiro
2009-09-11 6:22 ` Roland Dreier
2009-09-11 6:22 ` Roland Dreier
2009-09-11 6:40 ` [ofa-general] " Jason Gunthorpe
2009-09-11 6:40 ` Jason Gunthorpe
[not found] ` <20090911064019.GZ4973-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-09-11 16:58 ` Roland Dreier
2009-09-11 16:58 ` Roland Dreier
[not found] ` <adaljklifkt.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-15 7:03 ` KOSAKI Motohiro
2009-09-15 7:03 ` KOSAKI Motohiro
2009-09-15 8:27 ` Roland Dreier
2009-09-15 8:27 ` Roland Dreier
2009-09-15 12:38 ` Jeff Squyres
2009-09-15 12:38 ` Jeff Squyres
2009-09-16 16:30 ` Roland Dreier
2009-09-16 16:30 ` Roland Dreier
2009-09-16 16:40 ` [ofa-general] " Linus Torvalds
2009-09-16 16:40 ` Linus Torvalds
2009-09-17 11:30 ` Peter Zijlstra
2009-09-17 11:30 ` Peter Zijlstra
2009-09-17 14:24 ` [ofa-general] " Roland Dreier
[not found] ` <adafxalejiq.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-17 14:32 ` Roland Dreier
2009-09-17 14:32 ` Roland Dreier
[not found] ` <adaab0tej5c.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-17 14:49 ` Peter Zijlstra
2009-09-17 14:49 ` Peter Zijlstra
2009-09-17 15:03 ` Roland Dreier
2009-09-17 15:03 ` Roland Dreier
[not found] ` <adazl8td35u.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-17 15:22 ` Peter Zijlstra
2009-09-17 15:22 ` Peter Zijlstra
2009-09-17 15:45 ` Roland Dreier
2009-09-17 15:45 ` Roland Dreier
[not found] ` <adatyz1d17q.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-09-18 11:50 ` Ingo Molnar
2009-09-18 11:50 ` Ingo Molnar
2009-09-29 17:13 ` Pavel Machek
2009-09-29 17:13 ` Pavel Machek
[not found] ` <20090929171332.GD14405-I/5MKhXcvmPrBKCeMvbIDA@public.gmane.org>
2009-09-30 9:44 ` Ingo Molnar
2009-09-30 9:44 ` Ingo Molnar
[not found] ` <20090930094456.GD24621-X9Un+BFzKDI@public.gmane.org>
2009-09-30 16:02 ` Jason Gunthorpe
2009-09-30 16:02 ` Jason Gunthorpe
[not found] ` <20090930160232.GZ22310-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2009-10-12 18:19 ` Ingo Molnar
2009-10-12 18:19 ` Ingo Molnar
[not found] ` <20091012181944.GF17138-X9Un+BFzKDI@public.gmane.org>
2009-10-12 19:30 ` Jason Gunthorpe
2009-10-12 19:30 ` Jason Gunthorpe
2009-10-12 20:20 ` Ingo Molnar
[not found] ` <20091012202046.GA7648-X9Un+BFzKDI@public.gmane.org>
2009-10-13 4:05 ` Jason Gunthorpe
2009-10-13 4:05 ` Jason Gunthorpe
2009-10-13 6:40 ` Ingo Molnar
[not found] ` <20091013064006.GC9470-X9Un+BFzKDI@public.gmane.org>
2009-10-13 16:27 ` Jason Gunthorpe
2009-10-13 16:27 ` Jason Gunthorpe
2009-10-13 5:43 ` Brice Goglin
[not found] ` <4AD41373.8010108-MZpvjPyXg2s@public.gmane.org>
2009-10-13 6:38 ` Ingo Molnar
2009-10-13 6:38 ` Ingo Molnar
2009-09-30 17:06 ` Roland Dreier
2009-09-30 17:06 ` Roland Dreier
2009-10-02 16:32 ` Roland Dreier
2009-10-02 16:32 ` Roland Dreier
[not found] ` <ada3a61rc3j.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-10-02 20:45 ` Pavel Machek
2009-10-02 20:45 ` Pavel Machek
2009-10-07 22:34 ` Roland Dreier
2009-10-07 22:34 ` Roland Dreier
[not found] ` <ada3a5uq1dk.fsf-FYB4Gu1CFyUAvxtiuMwx3w@public.gmane.org>
2009-10-12 17:33 ` Peter Zijlstra
2009-10-12 17:33 ` Peter Zijlstra
2009-09-17 14:43 ` Peter Zijlstra
2009-09-17 14:43 ` Peter Zijlstra
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