linux-kernel - Re: CFS-v16: top shows incorrect CPU% for multi-threaded application

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Date:	Sat, 16 Jun 2007 10:17:09 +0300
From:	"Török Edvin" <edwintorok@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: Re: CFS-v16: top shows incorrect CPU% for multi-threaded application

On 6/13/07, Török Edvin <edwintorok@...il.com> wrote:
> Hi,
>
> When I run a multithreaded application, consisting of a "main thread"
> that is mostly idle, and
> 3 "worker threads" (using as much CPU as they can get), 'top' and 'ps'
> show that
> the application uses 0% CPU.
> If I turn off thread details in top, and ps it correctly shows the CPU
> usage of each thread.
>
> This happens only on 2.6.22-rc4-cfs-v16, on 2.6.21-1 everything is ok
> (top shows sum-of-all-threads-CPU-usage, i.e. ~98,99%).

This has been fixed in cfs-v17.

Thanks,
Edwin
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