From: Davide Libenzi <davidel@xmailserver.org>
To: Andi Kleen <andi@firstfloor.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
William Lee Irwin III <wli@holomorphy.com>
Subject: Re: [patch 1/4] KMON - kmon device/instrumentation ...
Date: Thu, 10 May 2007 08:22:51 -0700 (PDT) [thread overview]
Message-ID: <Pine.LNX.4.64.0705100819070.17907@alien.or.mcafeemobile.com> (raw)
In-Reply-To: <p73k5vgg6c9.fsf@bingen.suse.de>
On Thu, 10 May 2007, Andi Kleen wrote:
> Davide Libenzi <davidel@xmailserver.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)
I simply didn't know about relayfs ;) Randy told me when I posted
those, that BTW were never intended for merging. The buffering method used
is more similar to oprofile though.
- Davide
prev parent reply other threads:[~2007-05-10 15:23 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-05-06 23:49 Davide Libenzi
2007-05-10 13:23 ` Andi Kleen
2007-05-10 15:22 ` Davide Libenzi [this message]
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