From: Theodore Tso <tytso@mit.edu>
To: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
William Lee Irwin III <wli@holomorphy.com>,
Matt Mackall <mpm@selenic.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups
Date: Fri, 13 Apr 2007 10:08:27 -0400 [thread overview]
Message-ID: <20070413140827.GA8864@thunk.org> (raw)
In-Reply-To: <461EFB98.8050408@yahoo.com.au>
On Fri, Apr 13, 2007 at 01:40:08PM +1000, Nick Piggin wrote:
> With systemtap scripts, you could walk pagetables and print *the exact
> page information you want*, or you could walk pfns, or LRU, or page_tree,
> or walk the page tree then the rmap structures. And you can selectively
> cull out items you don't care about if you only care about a subset of
> items, based on arbitrary criteria. And you can most likely do all that
> more efficiently than with a conglomeration of various /proc files
> (assuming they even provide what you want in the first place).
Yes, but maintaining the systemtap scripts will be a nightmare, since
they would be outside the kernel, and as we change our internal data
structure, the scripts would become useless.
This is a fundamental problem with systemtap that we haven't been able
to solve yet, because solving it would freeze various internal data
structures or kernel functions. I agree that's not acceptable; which
is why I don't think systemtap would be a good match for the problem
we're trying to solve here.
- Ted
next prev parent reply other threads:[~2007-04-13 14:08 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
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 [this message]
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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