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Re: [PATCH 9/16] 2.6.17-rc6 perfmon2 patch for review: kernel-level API support (kapi)
- From: Christoph Hellwig <hch at infradead dot org>
- To: "Frank Ch. Eigler" <fche at redhat dot com>
- Cc: eranian at hpl dot hp dot com, Christoph Hellwig <hch at infradead dot org>, linux-kernel at vger dot kernel dot org, systemtap at sources dot redhat dot com, wcohen at redhat dot com, perfmon at napali dot hpl dot hp dot com
- Date: Fri, 16 Jun 2006 16:45:19 +0100
- Subject: Re: [PATCH 9/16] 2.6.17-rc6 perfmon2 patch for review: kernel-level API support (kapi)
- References: <200606150907.k5F97coF008178@frankl.hpl.hp.com> <20060616135014.GB12657@infradead.org> <20060616140234.GI10034@frankl.hpl.hp.com> <y0mhd2lumz7.fsf@ton.toronto.redhat.com>
On Fri, Jun 16, 2006 at 11:41:32AM -0400, Frank Ch. Eigler wrote:
> Whether one uses systemtap, raw kprobes, or some specialized
> tracing/stats-collecting patch surely forthcoming, kernel-level APIs
> would be needed to perform fine-grained kernel-scope measurements
> using these counters.
No, there's not need to add kernel bloat for performance monitoring.
This kind of stuff shoul dabsolutely be done from userspace.