linux-kernel - Re: [PATCH] Add per-cpu indexing to /proc/timer

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Message-ID: <20081126045004.GA3278@x200.localdomain>
Date:	Wed, 26 Nov 2008 07:50:04 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Joe Korty <joe.korty@...r.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Add per-cpu indexing to /proc/timer_list

On Tue, Nov 25, 2008 at 06:14:45PM -0500, Joe Korty wrote:
> Per-cpu indexing of /proc/timer_list.
> 
> /proc/timer_list, potentially a very large file, is in
> danger of overflowing its seq_file buffer.  So 'split up'
> the buffering on cpu ID boundaries.  This should make this
> file more likely to be useful on largish SMP systems.

What do you mean?

You can't overflow seq_file buffer unless kmalloc() will fail large
allocation. And changing internals doesn't change amount of stuff
to be shown, which is the only thing which can lead to large buffer
need.

> The model followed is that in /proc/interrupts, which
> splits up its buffering on (most) irq boundaries.
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