linux-kernel - Re: [RFC][PATCH] Per container statistics

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Message-ID: <6599ad830705240912q1d556c66xe239a9940fd8f373@mail.gmail.com>
Date:	Thu, 24 May 2007 09:12:41 -0700
From:	"Paul Menage" <menage@...gle.com>
To:	balbir@...ux.vnet.ibm.com
Cc:	vatsa@...ibm.com, linux-kernel@...r.kernel.org, xemul@...ru,
	dev@...ru, akpm@...ux-foundation.org, devel@...nvz.org
Subject: Re: [RFC][PATCH] Per container statistics

On 5/24/07, Balbir Singh <balbir@...ux.vnet.ibm.com> wrote:
>
> I thought about this approach, but did not implement the code this way
> because a system could have thousands of containers and expecting a
> statistics application to open a file descriptor each time for each
> container will turn out to be an expensive operation
>
> overhead =  2 syscalls (open + close) * number of containers * frequency
>             of stats collections

But you can cache the file handles open between stats calls, assuming
you're doing them repeatedly.

Paul
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