linux-kernel - Re: [PATCH 1/3] taskstats-fork: Add a new taskstats command to get notification on fork/clone

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Message-ID: <20090831052629.GA16742@balbir.in.ibm.com>
Date:	Mon, 31 Aug 2009 10:56:29 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	Guillaume Chazarain <guichaz@...il.com>
Cc:	Nikanth Karthikesan <knikanth@...e.de>,
	linux-kernel@...r.kernel.org, procps-feedback@...ts.sf.net,
	Albert Cahalan <albert@...rs.sf.net>
Subject: Re: [PATCH 1/3] taskstats-fork: Add a new taskstats command to get
	notification on fork/clone

* Guillaume Chazarain <guichaz@...il.com> [2009-08-30 21:52:22]:

> On Tue, Jul 21, 2009 at 8:24 AM, Nikanth Karthikesan<knikanth@...e.de> wrote:
> > Ah.. proc-events was the exact thing, I was looking for! Thanks.
> 
> AFAICT proc-events can only be used by root, so that makes it
> unsuitable for *top.
> 
> Anyway, iotop will always have to iterate over all threads to query
> their taskstats and other attributes, so the O(nr_threads) complexity
> is unavoidable.
>

Unless you want the stats for tgid in signal struct. In some cases we
accumulate, in some we don't. But yes irrespective or kernel/user
space the complexity exists. 

-- 
	Balbir
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