[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-ID: <46490573.7030101@cs.umass.edu>
Date: Mon, 14 May 2007 20:57:23 -0400
From: Ting Yang <tingy@...umass.edu>
To: tingy@...umass.edu
CC: Ingo Molnar <mingo@...e.hu>,
William Lee Irwin III <wli@...omorphy.com>,
Srivatsa Vaddagiri <vatsa@...ibm.com>, efault@....de,
linux-kernel@...r.kernel.org
Subject: Re: fair clock use in CFS
>
>
> It is possible to do something like this in check_preemption ?
>
> delta = curr->fair_key - first->fair_key;
>
> if (delta > ??? [scale it as you wish] ||
> (curr->key > first->key) && (curr->wait_runtime > ???
> [simple funtion of curr->weight]) )
> preempt
Forgive me, there is typo in the above check. It should be "less than"
since we are controlling negative lags.
(curr->key > first->key) && (curr->wait_runtime < ??? [simple
funtion of curr->weight]) )
>
> A limit control on wait_runtime may prevent a high weight task from
> running for too long, so that others get executed a little earlier.
> Just a thought :-)
>
>
Ting
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists