linux-kernel - Re: swap map

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Message-ID: <20070130112024.GA18705@infradead.org>
Date:	Tue, 30 Jan 2007 11:20:24 +0000
From:	Christoph Hellwig <hch@...radead.org>
To:	Howard Chu <hyc@...as.com>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: swap map

On Tue, Jan 30, 2007 at 03:12:35AM -0800, Howard Chu wrote:
> In the it-would-be-nice department... While I was twiddling with swappiness 
> and benchmarking some code, I thought it would be pretty cool if there was 
> a node in /proc/<pid> that would show which pages of a process are resident 
> or nonresident. I'm not sure that it would be useful very often, but I was 
> thinking one could get a snapshot of that, correlated with traces from a 
> malloc profiler, to show what portions of a program's memory usage was in 
> active use vs idle.

That's be a remote mincore().  This should be more or less trivial,
do_mincore would need a mm_struct argument instead of always using
current->mm and we'd need a simple seq_file interface iterating over it.

Any volunteers?
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