From: Andrew Morton <akpm@osdl.org>
To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
Cc: linux-mm@kvack.org
Subject: Re: use for page_state accounting fields
Date: Mon, 16 Aug 2004 14:31:49 -0700 [thread overview]
Message-ID: <20040816143149.510a2f90.akpm@osdl.org> (raw)
In-Reply-To: <20040816192941.GB21238@logos.cnet>
Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
>
> 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.
Take a peek in /proc/vmstat ;)
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next prev parent reply other threads:[~2004-08-16 21:31 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-16 19:29 Marcelo Tosatti
2004-08-16 21:31 ` Andrew Morton [this message]
2004-08-16 20:33 ` Marcelo Tosatti
2004-08-16 22:34 ` Andrew Morton
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