From: Nick Piggin <piggin@cyberone.com.au>
To: Thomas Schlichter <schlicht@uni-mannheim.de>
Cc: Con Kolivas <kernel@kolivas.org>,
linux kernel mailing list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH]O18.1int
Date: Sat, 23 Aug 2003 19:18:53 +1000 [thread overview]
Message-ID: <3F47317D.3030802@cyberone.com.au> (raw)
In-Reply-To: <200308231108.48053.schlicht@uni-mannheim.de>
Thomas Schlichter wrote:
>On Saturday 23 August 2003 07:55, Con Kolivas wrote:
>
>>Some high credit tasks were being missed due to their prolonged cpu burn at
>>startup flagging them as low credit tasks.
>>
>>Low credit tasks can now recover to become high credit.
>>
>>Con
>>
>
>Hi Con!
>
>First of all... Your interactive scheduler work is GREAT! I really like it...!
>
>Now I tried to unterstand what exacly the latest patch does, and as far as I
>can see the first and the third hunk just delete respectively expand the
>macro VARYING_CREDIT(p). But the second hunk helps processes to get some
>interactive_credit until they become a HIGH_CREDIT task. This looks
>reasonable to me...
>
>So, now I wanted to know how a task may lose its interactive_credit again...
>The only code I saw doing this is exaclty the third hunk of your patch. But
>if a process is a HIGH_CREDIT task it can never lose its interactive_credit
>again. Is that intented?
>
>I think the third hunk should look like following:
>@@ -1548,7 +1545,7 @@ switch_tasks:
> prev->sleep_avg -= run_time;
> if ((long)prev->sleep_avg <= 0){
> prev->sleep_avg = 0;
>- prev->interactive_credit -= VARYING_CREDIT(prev);
>+ prev->interactive_credit -= !(LOW_CREDIT(prev));
> }
> prev->timestamp = now;
>
>As an additional idea I think interactive_credit should be allowed to be a bit
>bigger than MAX_SLEEP_AVG and a bit lower than -MAX_SLEEP_AVG. This would
>make LOW_CREDIT processes stay LOW_CREDIT even if they do some sleep and
>HIGH_CREDIT processes star HIGH_CREDIT even if they do some computing...
>
>But of course I may completely miss something...
>
>
Hi
I don't know what is preferred on lkml, but I dislike mixing booleans
and integer arithmetic.
if (!LOW_CREDIT(prev))
prev->interactive_credit--;
Easier to read IMO.
next prev parent reply other threads:[~2003-08-23 9:19 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-08-23 5:55 [PATCH]O18.1int Con Kolivas
2003-08-23 9:08 ` [PATCH]O18.1int Thomas Schlichter
2003-08-23 9:18 ` Nick Piggin [this message]
2003-08-23 12:22 ` [PATCH]O18.1int Con Kolivas
2003-08-23 12:21 ` [PATCH]O18.1int Con Kolivas
2003-08-23 9:32 ` [PATCH]O18.1int Andrew Morton
2003-08-23 9:49 ` [PATCH]O18.1int Nick Piggin
2003-08-23 16:58 ` [PATCH]O18.1int Con Kolivas
2003-08-23 21:49 ` [PATCH]O18.1int Andrew Morton
2003-08-24 2:46 ` [PATCH]O18.1int Con Kolivas
2003-08-23 13:29 ` [PATCH]O18.1int Con Kolivas
2003-08-25 9:24 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 9:42 ` [PATCH]O18.1int Alex Riesen
2003-08-25 10:16 ` [PATCH]O18.1int Con Kolivas
2003-08-25 10:21 ` [PATCH]O18.1int Alex Riesen
2003-08-25 21:02 ` [PATCH]O18.1int Alex Riesen
2003-08-25 22:48 ` [PATCH]O18.1int Con Kolivas
2003-08-25 23:00 ` [PATCH]O18.1int Alex Riesen
2003-08-26 22:03 ` [PATCH]O18.1int Alex Riesen
2003-08-25 10:34 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 10:50 ` [PATCH]O18.1int Con Kolivas
2003-08-25 11:15 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 11:37 ` [PATCH]O18.1int Con Kolivas
2003-08-25 11:58 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 12:28 ` [PATCH]O18.1int Con Kolivas
2003-08-25 12:49 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 13:32 ` [PATCH]O18.1int Con Kolivas
2003-08-25 10:17 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 10:34 ` [PATCH]O18.1int Alex Riesen
2003-08-25 11:23 ` [PATCH]O18.1int Måns Rullgård
2003-08-25 10:48 ` [PATCH]O18.1int Con Kolivas
[not found] ` <3F49E482.7030902@cyberone.com.au>
[not found] ` <20030825102933.GA14552@Synopsys.COM>
2003-08-26 22:20 ` [PATCH]O18.1int Alex Riesen
2003-08-27 2:26 ` [PATCH]O18.1int Nick Piggin
2003-08-23 22:03 [PATCH]O18.1int Voluspa
2003-08-24 4:04 ` [PATCH]O18.1int Con Kolivas
2003-08-28 12:23 [PATCH]O18.1int Guillaume Chazarain
2003-08-28 13:43 [PATCH]O18.1int Guillaume Chazarain
2003-08-28 13:58 ` [PATCH]O18.1int Nick Piggin
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