linux-kernel - Re: Query on kernel metrics available

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Message-ID: <20071119122936.6e209a18@the-village.bc.nu>
Date:	Mon, 19 Nov 2007 12:29:36 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	raju@...ux-delhi.org
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Query on kernel metrics available

On Mon, 19 Nov 2007 12:59:26 +0530
Raj Mathur <raju@...ux-delhi.org> wrote:

> A competing OS vendor is claiming that the Linux kernel has no way to 
> measure the following:
> 
> a. Time spent waiting for page faults in percent
> 
> b. Total transfer time for each auxiliary memory in percent
> 
> c. Time in percent when one or more tasks were blocked waiting for 
> memory resources
> 
> d. Time spent waiting for page faults in percent

a an d appear to be the same thing

> I was wondering if the claims were pure FUD or are measurements 
> possible -- whether they are actually implemented or not is not 
> important (at least at this stage).  Apologies if the descriptions 
> aren't very precise; OTOH that leaves us room to interpret the claims 
> in a favourable (to us) manner :)

Systemtap as shipped by most of the enterprise vendors can measure all of
this quite easily. 

Alan
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