From: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
To: akpm@osdl.org
Cc: linux-mm@kvack.org
Subject: use for page_state accounting fields
Date: Mon, 16 Aug 2004 16:29:42 -0300 [thread overview]
Message-ID: <20040816192941.GB21238@logos.cnet> (raw)
Hi Andrew,
I suppose you wrote the page_state per-CPU statistics structure.
There are some fields, for instance pgactivate/pgdeactivate, that
do not seem to be used anywhere. Sure, they are useful for statistics,
but no place in the kernel exports them to userspace AFAICS.
unsigned long pgactivate; /* pages moved inactive->active */
unsigned long pgdeactivate; /* pages moved active->inactive */
Counting them is somewhat expensive I believe (need to disable IRQ), based
on the assumption that these days any cycle is a loss.
So, from my POV we should
a) export them to userspace
b) surround them by CONFIG_DEBUG_MMSTATS or something similar
Tell me I'm wrong.
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next reply other threads:[~2004-08-16 19:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-16 19:29 Marcelo Tosatti [this message]
2004-08-16 21:31 ` Andrew Morton
2004-08-16 20:33 ` Marcelo Tosatti
2004-08-16 22:34 ` Andrew Morton
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