linux-kernel - Re: [PATCH] tracer for sys_open()

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Message-ID: <20090129155341.GB20679@redhat.com>
Date:	Thu, 29 Jan 2009 10:53:42 -0500
From:	"Frank Ch. Eigler" <fche@...hat.com>
To:	Frédéric Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Roland McGrath <roland@...hat.com>,
	utrace-devel@...hat.com, "Kok, Auke" <auke-jan.h.kok@...el.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	powertop ml <power@...host.org>,
	Arjan van de Ven <arjan@...ux.intel.com>,
	srostedt@...hat.com,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Neil Horman <nhorman@...driver.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>
Subject: Re: [PATCH] tracer for sys_open() - sreadahead

Hi -

On Thu, Jan 29, 2009 at 04:34:46PM +0100, Frédéric Weisbecker wrote:
> 2009/1/29 Ingo Molnar <mingo@...e.hu>:
> [...]
> >> > sure - how do the minimal bits/callbacks look like which enable syscall
> >> > tracing?

> I know you are talking about the only necessary bits from utrace to
> have the syscalls tracing.  But I can't answer you better than would
> the utrace people.  And actually I'm not sure the utrace bits for
> syscall tracing can be isolated from the rest of its core.

My understanding is that the parts of utrace that remain out-of-tree
are relatively integrated, and just present the programmatic callback
API to the already merged "tracehook" layer.

- FChE
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