From: Christoph Lameter <cl@linux-foundation.org>
To: Mathieu Desnoyers <compudj@krystal.dyndns.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>,
Tom Zanussi <zanussi@comcast.net>,
prasad@linux.vnet.ibm.com, Martin Bligh <mbligh@google.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Steven Rostedt <rostedt@goodmis.org>,
od@novell.com, "Frank Ch. Eigler" <fche@redhat.com>,
Andrew Morton <akpm@linux-foundation.org>,
hch@lst.de, David Wilder <dwilder@us.ibm.com>,
linux-mm@kvack.org
Subject: Re: Unified tracing buffer
Date: Tue, 23 Sep 2008 13:33:09 -0500 [thread overview]
Message-ID: <48D93665.8030200@linux-foundation.org> (raw)
In-Reply-To: <20080923181313.GA4947@Krystal>
Mathieu Desnoyers wrote:
>
> I think we should instead try to figure out what is currently missing in
> the kernel vmap mechanism (probably the ability to vmap from large 4MB
> pages after boot), and fix _that_ instead (if possible), which would not
> only benefit to tracing, but also to module support.
With some custom code one can vmap 2MB pages on x86. See the VMEMMAP support
in the x86 arch. The code in mm/sparse-vmemmap.c could be abstracted for a
general 2MB mapping API to reduce TLB pressure for the buffers. If there are
concerns about fragmentation then one could fallback to 4kb TLBs. See the
virtualizable compound page patchset which does something similar.
> I added Christoph Lameter to the CC list, he always comes with clever
> ideas. :)
Oh mostly we are just recycling the old ideas.
next prev parent reply other threads:[~2008-09-23 18:45 UTC|newest]
Thread overview: 122+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-19 21:33 Unified tracing buffer Martin Bligh
2008-09-19 21:42 ` Randy Dunlap
2008-09-19 21:57 ` Martin Bligh
2008-09-19 22:41 ` Olaf Dabrunz
2008-09-19 22:19 ` Martin Bligh
2008-09-20 8:10 ` Olaf Dabrunz
2008-09-20 8:29 ` Steven Rostedt
2008-09-20 11:40 ` Mathieu Desnoyers
2008-09-20 8:26 ` Steven Rostedt
2008-09-20 11:44 ` Mathieu Desnoyers
2008-09-19 22:28 ` Olaf Dabrunz
2008-09-19 22:09 ` Martin Bligh
2008-09-19 23:18 ` Frank Ch. Eigler
2008-09-20 8:50 ` Steven Rostedt
2008-09-20 13:37 ` Mathieu Desnoyers
2008-09-20 13:51 ` Steven Rostedt
2008-09-20 14:54 ` Steven Rostedt
2008-09-22 18:45 ` Mathieu Desnoyers
2008-09-22 21:39 ` Steven Rostedt
2008-09-23 3:27 ` Mathieu Desnoyers
2008-09-20 0:07 ` Peter Zijlstra
2008-09-22 14:07 ` K.Prasad
2008-09-22 14:45 ` Peter Zijlstra
2008-09-22 16:29 ` Martin Bligh
2008-09-22 16:36 ` Peter Zijlstra
2008-09-22 20:50 ` Masami Hiramatsu
2008-09-23 3:05 ` Mathieu Desnoyers
2008-09-23 2:49 ` Mathieu Desnoyers
2008-09-23 5:25 ` Tom Zanussi
2008-09-23 9:31 ` Peter Zijlstra
2008-09-23 18:13 ` Mathieu Desnoyers
2008-09-23 18:33 ` Christoph Lameter [this message]
2008-09-23 18:56 ` Linus Torvalds
2008-09-23 13:50 ` Mathieu Desnoyers
2008-09-23 14:00 ` Martin Bligh
2008-09-23 17:55 ` K.Prasad
2008-09-23 18:27 ` Martin Bligh
2008-09-24 3:50 ` Tom Zanussi
2008-09-24 5:42 ` K.Prasad
2008-09-25 6:07 ` [RFC PATCH 0/8] current relay cleanup patchset Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 1/8] relay - Clean up relay_switch_subbuf() and make waking up consumers optional Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 2/8] relay - Make the relay sub-buffer switch code replaceable Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 3/8] relay - Add channel flags to relay, remove global callback param Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 4/8] relay - Add reserved param to switch-subbuf, in preparation for non-pad write/reserve Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 5/8] relay - Map the first sub-buffer at the end of the buffer, for temporary convenience Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 6/8] relay - Replace relay_reserve/relay_write with non-padded versions Tom Zanussi
2008-09-25 6:07 ` [RFC PATCH 7/8] relay - Remove padding-related code from relay_read()/relay_splice_read() et al Tom Zanussi
2008-09-25 6:08 ` [RFC PATCH 8/8] relay - Clean up remaining padding-related junk Tom Zanussi
2008-09-23 5:27 ` [PATCH 1/3] relay - clean up subbuf switch Tom Zanussi
2008-09-23 20:15 ` Andrew Morton
2008-09-23 5:27 ` [PATCH 2/3] relay - make subbuf switch replaceable Tom Zanussi
2008-09-23 20:17 ` Andrew Morton
2008-09-23 5:27 ` [PATCH 3/3] relay - add channel flags Tom Zanussi
2008-09-23 20:20 ` Andrew Morton
2008-09-24 3:57 ` Tom Zanussi
2008-09-20 0:26 ` Unified tracing buffer Marcel Holtmann
2008-09-20 9:03 ` Steven Rostedt
2008-09-20 13:55 ` Mathieu Desnoyers
2008-09-20 14:12 ` Arjan van de Ven
2008-09-22 18:52 ` Mathieu Desnoyers
2008-10-02 15:28 ` Jason Baron
2008-10-03 16:11 ` Mathieu Desnoyers
2008-10-03 18:37 ` Jason Baron
2008-10-03 19:10 ` Mathieu Desnoyers
2008-10-03 19:25 ` Jason Baron
2008-10-03 19:56 ` Mathieu Desnoyers
2008-10-03 20:25 ` Jason Baron
2008-10-03 21:52 ` Frank Ch. Eigler
2008-09-22 3:09 ` KOSAKI Motohiro
2008-09-22 9:57 ` Peter Zijlstra
2008-09-23 2:36 ` Mathieu Desnoyers
2008-09-22 13:57 ` K.Prasad
2008-09-22 19:45 ` Masami Hiramatsu
2008-09-22 20:13 ` Martin Bligh
2008-09-22 22:25 ` Masami Hiramatsu
2008-09-22 23:11 ` Darren Hart
2008-09-23 0:04 ` Masami Hiramatsu
2008-09-22 23:16 ` Martin Bligh
2008-09-23 0:05 ` Masami Hiramatsu
2008-09-23 0:12 ` Martin Bligh
2008-09-23 14:49 ` Masami Hiramatsu
2008-09-23 15:04 ` Mathieu Desnoyers
2008-09-23 15:30 ` Masami Hiramatsu
2008-09-23 16:01 ` Linus Torvalds
2008-09-23 17:04 ` Masami Hiramatsu
2008-09-23 17:30 ` Thomas Gleixner
2008-09-23 18:59 ` Masami Hiramatsu
2008-09-23 19:36 ` Thomas Gleixner
2008-09-23 19:38 ` Martin Bligh
2008-09-23 19:41 ` Thomas Gleixner
2008-09-23 19:50 ` Martin Bligh
2008-09-23 20:03 ` Thomas Gleixner
2008-09-23 21:02 ` Martin Bligh
2008-09-23 20:03 ` Masami Hiramatsu
2008-09-23 20:08 ` Thomas Gleixner
2008-09-23 15:46 ` Linus Torvalds
2008-09-23 0:39 ` Linus Torvalds
2008-09-23 1:26 ` Roland Dreier
2008-09-23 1:39 ` Steven Rostedt
2008-09-23 2:02 ` Mathieu Desnoyers
2008-09-23 2:26 ` Darren Hart
2008-09-23 2:31 ` Mathieu Desnoyers
2008-09-23 3:26 ` Linus Torvalds
2008-09-23 3:36 ` Mathieu Desnoyers
2008-09-23 4:05 ` Linus Torvalds
2008-09-23 3:43 ` Steven Rostedt
2008-09-23 4:10 ` Masami Hiramatsu
2008-09-23 4:17 ` Martin Bligh
2008-09-23 15:23 ` Masami Hiramatsu
2008-09-23 10:53 ` Steven Rostedt
2008-09-23 4:19 ` Linus Torvalds
2008-09-23 14:12 ` Mathieu Desnoyers
2008-09-23 2:30 ` Mathieu Desnoyers
2008-09-23 3:06 ` Masami Hiramatsu
2008-09-23 14:36 ` KOSAKI Motohiro
2008-09-23 15:02 ` Frank Ch. Eigler
2008-09-23 15:21 ` Masami Hiramatsu
2008-09-23 17:59 ` KOSAKI Motohiro
2008-09-23 18:28 ` Martin Bligh
2008-09-23 3:33 ` Andi Kleen
2008-09-23 3:47 ` Martin Bligh
2008-09-23 5:04 ` Andi Kleen
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