From: Andrew Morton <akpm@osdl.org>
To: Patrick Mau <mau@oscar.ping.de>
Cc: linux-kernel@vger.kernel.org
Subject: Re: Workaround for wrapping loadaverage
Date: Mon, 8 Nov 2004 01:27:07 -0800 [thread overview]
Message-ID: <20041108012707.1e141772.akpm@osdl.org> (raw)
In-Reply-To: <20041108001932.GA16641@oscar.prima.de>
Patrick Mau <mau@oscar.ping.de> wrote:
>
> n a previous message archived at
>
> http://www.ussg.iu.edu/hypermail/linux/kernel/0410.2/2950.html
>
> I described a problem with a wrapping load average on my SMP system.
> The following small userspace load simulation exactly matches the
> numbers I am seeing.
>
> We can only account for 1024 runnable processes, since we have 22 bits
> precision, I would like to suggest a patch to calc_load in kernel/timer.c
> that would limit the number of active tasks:
>
>
> if (active_tasks > 1024 * FIXED_1)
> active_tasks = 1024 * FIXED_1;
>
It's better than wrapping to zero...
Why do we need 11 bits after the binary point?
next prev parent reply other threads:[~2004-11-08 9:34 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-11-08 0:19 Patrick Mau
2004-11-08 9:27 ` Andrew Morton [this message]
2004-11-08 10:25 ` Patrick Mau
2004-11-08 23:50 ` Andrew Morton
2004-11-09 0:43 ` Patrick Mau
2004-11-09 18:51 ` Herbert Poetzl
2004-11-09 21:49 ` Con Kolivas
2004-11-10 6:20 ` Herbert Poetzl
2004-11-10 9:57 ` Con Kolivas
2004-11-10 7:07 ` Nick Piggin
2004-11-10 23:31 ` Herbert Poetzl
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