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

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Message-ID: <461EE890.2040601@yahoo.com.au>
Date:	Fri, 13 Apr 2007 12:18:56 +1000
From:	Nick Piggin <nickpiggin@...oo.com.au>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	William Lee Irwin III <wli@...omorphy.com>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/13] maps: pagemap, kpagemap, and related cleanups

Andrew Morton wrote:
> On Fri, 13 Apr 2007 11:42:29 +1000 Nick Piggin <nickpiggin@...oo.com.au> wrote:

>>Maybe. How about LRU? Reclaim performance is bad, and you want to work out
>>which pages keep going off the end of it, or which pages keep getting
>>written out via it, or who's pages are on the active list, forcing mine
>>out.
> 
> 
> I guess we have static analysis versus dynamic.  The interfaces which Matt
> is proposing are suited to answering the question "what is my memory being
> used for" (static).  They're unlikely to be useful for answering the question
> "what's happening in the VM" (dynamic).  Systemtap is probably better for the
> dynamic analysis.

"what is my memory being used for *now*" ;)


> I guess one could generate an answer to the static question with systemtap,
> by accumulating running counts across the application lifetime and then
> snapshotting them.  Sounds hard though.

Can't you just traverse arbitrary kernel data structures at a given point
in time, exactly like the /proc/ call is doing?

-- 
SUSE Labs, Novell Inc.
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