From: Matt Mackall <mpm@selenic.com>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
William Lee Irwin III <wli@holomorphy.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups
Date: Thu, 12 Apr 2007 20:38:40 -0500 [thread overview]
Message-ID: <20070413013840.GK11115@waste.org> (raw)
In-Reply-To: <461ED675.3060909@yahoo.com.au>
On Fri, Apr 13, 2007 at 11:01:41AM +1000, Nick Piggin wrote:
> >Basically: to show what the hell's going on in the VM.
>
> kprobes / systemtap isn't good enough?
It's not really a good match to the kprobes model. I'm not interested
in events, per se. I don't want to need to know about every single
alloc/free of N different varieties integrated from boot onward to
build up an image of the state of the system. Instead, I want to take
snapshots of the state of the VM.
The main goal here is to be able to answer the question "where's my
memory going?". Currently you can't really give a good answer to that
question from userspace because of shared mappings, etc.
There are lots of secondary questions that follow on very quickly from
that, like "what parts of my shared mappings are or aren't shared, and
why?", "what's actually in my application's working set?" and "how much
of this crap can I ditch?".
--
Mathematics is the supreme nostalgia of our time.
next prev parent reply other threads:[~2007-04-13 1:51 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-04-04 2:43 [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups Matt Mackall
2007-04-04 2:43 ` [PATCH 1/13] maps: Uninline some functions in the page walker Matt Mackall
2007-04-04 2:43 ` [PATCH 2/13] maps: Eliminate the pmd_walker struct " Matt Mackall
2007-04-04 2:43 ` [PATCH 3/13] maps: Remove vma from args " Matt Mackall
2007-04-04 2:43 ` [PATCH 4/13] maps: Propagate errors from callback in " Matt Mackall
2007-04-04 2:43 ` [PATCH 5/13] maps: Add callbacks for each level to " Matt Mackall
2007-04-04 2:43 ` [PATCH 6/13] maps: Move the page walker code to lib/ Matt Mackall
2007-04-04 3:51 ` Nick Piggin
2007-04-04 5:08 ` Matt Mackall
2007-04-04 5:50 ` Nick Piggin
2007-04-04 21:48 ` Matt Mackall
2007-04-05 1:32 ` Nick Piggin
2007-04-05 1:50 ` Nick Piggin
2007-04-04 2:43 ` [PATCH 7/13] maps: Simplify interdependence of /proc/pid/maps and smaps Matt Mackall
2007-04-04 2:43 ` [PATCH 8/13] maps: Move clear_refs code to task_mmu.c Matt Mackall
2007-04-04 2:43 ` [PATCH 9/13] maps: Regroup task_mmu by interface Matt Mackall
2007-04-04 2:43 ` [PATCH 10/13] maps: Make /proc/pid/smaps optional under CONFIG_EMBEDDED Matt Mackall
2007-04-04 2:43 ` [PATCH 11/13] maps: Make /proc/pid/clear_refs option " Matt Mackall
2007-04-04 6:22 ` David Rientjes
2007-04-04 2:43 ` [PATCH 12/13] maps: Add /proc/pid/pagemap interface Matt Mackall
2007-04-04 11:18 ` Nikita Danilov
2007-04-04 16:32 ` Matt Mackall
2007-04-04 18:03 ` Nikita Danilov
2007-04-04 21:59 ` Matt Mackall
2007-04-04 2:43 ` [PATCH 13/13] maps: Add /proc/kpagemap interface Matt Mackall
2007-04-12 23:10 ` [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups William Lee Irwin III
2007-04-12 23:32 ` Andrew Morton
2007-04-12 23:42 ` William Lee Irwin III
2007-04-13 0:25 ` Nick Piggin
2007-04-13 0:15 ` Nick Piggin
2007-04-13 0:25 ` Matt Mackall
2007-04-13 1:01 ` Nick Piggin
2007-04-13 1:38 ` Matt Mackall [this message]
2007-04-13 2:11 ` Nick Piggin
2007-04-13 0:42 ` Andrew Morton
2007-04-13 1:14 ` Nick Piggin
2007-04-13 1:22 ` Andrew Morton
2007-04-13 1:42 ` Nick Piggin
2007-04-13 1:57 ` Matt Mackall
2007-04-13 2:21 ` Nick Piggin
2007-04-13 2:23 ` Matt Mackall
2007-04-13 2:54 ` Nick Piggin
2007-04-13 12:24 ` Ananth N Mavinakayanahalli
2007-04-14 8:13 ` Maneesh Soni
2007-04-13 1:57 ` Andrew Morton
2007-04-13 2:05 ` Matt Mackall
2007-04-13 2:29 ` Nick Piggin
2007-04-13 2:18 ` Nick Piggin
2007-04-13 2:32 ` Andrew Morton
2007-04-13 2:50 ` Nick Piggin
2007-04-13 3:10 ` Nick Piggin
2007-04-13 6:53 ` William Lee Irwin III
2007-04-13 7:05 ` Nick Piggin
2007-04-13 7:51 ` Christoph Hellwig
2007-04-13 8:03 ` Nick Piggin
2007-04-13 8:13 ` Christoph Hellwig
2007-04-13 8:25 ` Nick Piggin
2007-04-13 9:46 ` Christoph Hellwig
2007-04-13 21:17 ` Frank Ch. Eigler
2007-04-16 10:59 ` Christoph Hellwig
2007-04-16 21:36 ` Andi Kleen
2007-04-16 21:01 ` Frank Ch. Eigler
2007-04-13 8:15 ` William Lee Irwin III
2007-04-13 12:13 ` Ananth N Mavinakayanahalli
2007-04-13 12:46 ` Nick Piggin
2007-04-13 3:40 ` Nick Piggin
2007-04-13 6:55 ` William Lee Irwin III
2007-04-13 7:03 ` Nick Piggin
2007-04-13 7:08 ` William Lee Irwin III
2007-04-13 14:08 ` Theodore Tso
2007-04-16 11:00 ` Christoph Hellwig
2007-04-13 17:13 ` Matt Mackall
2007-04-13 16:24 ` Matt Mackall
2007-04-13 17:03 ` Andrew Morton
2007-04-13 17:24 ` Matt Mackall
2007-04-13 17:58 ` Andrew Morton
2007-04-13 0:15 ` Matt Mackall
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