linux-kernel - Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

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Message-ID: <20070412231050.GN2986@holomorphy.com>
Date:	Thu, 12 Apr 2007 16:10:50 -0700
From:	William Lee Irwin III <wli@...omorphy.com>
To:	Matt Mackall <mpm@...enic.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

On Tue, Apr 03, 2007 at 09:43:30PM -0500, Matt Mackall wrote:
> This patch series introduces /proc/pid/pagemap and /proc/kpagemap,
> which allow detailed run-time examination of process memory usage at a
> page granularity.
> The first several patches whip the page-walking code introduced for
> /proc/pid/smaps and clear_refs into a more generic form, the next
> couple make those interfaces optional, and the last two introduce the
> new interfaces, also optional.

This solves a real-life problem for Oracle system monitoring software
(specifically EM). Among the tasks it must carry out is determining
per-process memory footprint of a set of cooperating tasks (i.e. Oracle
processes). RSS is inadequate for this due to page sharing; this work
provides sufficient information to determine what EM needs.


-- wli
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