linux-kernel - Re: [patch 1/4] KMON - kmon device/instrumentation ...

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Message-ID: <p73k5vgg6c9.fsf@bingen.suse.de>
Date:	10 May 2007 15:23:50 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	William Lee Irwin III <wli@...omorphy.com>
Subject: Re: [patch 1/4] KMON - kmon device/instrumentation ...

Davide Libenzi <davidel@...ilserver.org> writes:

> This patch serie introduces a way to log high frequency/volume data
> out of the kernel. Logging scheduler operations for example, with
> loads that generate tenths of thousands of context switches per second
> (possibly from multiple CPUs), can overload the kernel printk. Also,
> logging in binary form helps in reducing the size of the logged data
> that is tranfered from kernel to userspace. The kmon logger uses per
> CPU buffers (rings) that are flushed at a given frequency to all the
> instances of the kmon devices.

Sounds like you reinvented relayfs? (and ktrace before that)

-Andi
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