netdev - Re: [PATCH] net: add tracepoints to socket api

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Message-ID: <20090128212809.GA19228@hmsreliant.think-freely.org>
Date:	Wed, 28 Jan 2009 16:28:09 -0500
From:	Neil Horman <nhorman@...driver.com>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH] net: add tracepoints to socket api

On Tue, Jan 27, 2009 at 01:47:04PM -0500, Christoph Hellwig wrote:
> On Tue, Jan 27, 2009 at 10:21:41AM -0800, David Miller wrote:
> > The block layer already merged trace annotations.  I therefore see no
> > harm in merging the net bits.
> 
> The block layer also has a consumer for them (blktrace) and soon a
> second one (the ftrace plugin)
> 
> 

FWIW, ftrace will also work well on these syscalls (which I think is rather
usefull).  Another use case came across my path the other day too.  I've had
several requests from various people to find a way to provide unifying frame
drop indicators.  Basically people hate to have to dig through various stat
files and tools to look at all the places a frame can be dropped within our
network stack.  I think a nice solution to this problem might be some
tracepoints that people could use to gather comprehensive tx/rx frame drop
information using one tool.  Of course, these provided tracepoints don't do
that, but I think it would be good to get the existing tracepoint set in before
I go poking at an implementation of that, just to ensure I avoid duplicate work

Neil

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