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Re: [Xen-devel] [RFC] [PATCH] Accurate accounting for credit scheduler

To: "George Dunlap" <George.Dunlap@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [RFC] [PATCH] Accurate accounting for credit scheduler
From: "Jan Beulich" <JBeulich@xxxxxxxxxx>
Date: 2009年8月25日 15:48:09 +0100
Cc: Steven Hand <Steven.Hand@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
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>>> George Dunlap <George.Dunlap@xxxxxxxxxxxxx> 25.08.09 16:23 >>>
>--- a/xen/common/sched_credit.c Mon Aug 24 08:27:30 2009 +0100
>+++ b/xen/common/sched_credit.c Mon Aug 24 21:39:35 2009 +0100
>@@ -44,11 +44,12 @@
> #define CSCHED_MSECS_PER_TICK 10
> #define CSCHED_MSECS_PER_TSLICE \
> (CSCHED_MSECS_PER_TICK * CSCHED_TICKS_PER_TSLICE)
>-#define CSCHED_CREDITS_PER_TICK 100
>+#define CSCHED_CREDITS_PER_MSEC 100000
> #define CSCHED_CREDITS_PER_TSLICE \
>- (CSCHED_CREDITS_PER_TICK * CSCHED_TICKS_PER_TSLICE)
>+ (CSCHED_MSECS_PER_TSLICE * CSCHED_CREDITS_PER_MSEC)
> #define CSCHED_CREDITS_PER_ACCT \
>- (CSCHED_CREDITS_PER_TICK * CSCHED_TICKS_PER_ACCT)
>+ (CSCHED_CREDITS_PER_MSEC * CSCHED_MSECS_PER_TSLICE)
This effectively makes an assumption that CSCHED_TICKS_PER_ACCT ==
CSCHED_TICKS_PER_TSLICE, which I don't think the rest of the code
really intends (or if it does, distinguishing those two as well as
CSCHED_CREDITS_PER_TSLICE and CSCHED_CREDITS_PER_ACCT would
become pointless).
>+#define CSCHED_STIME_TO_CREDIT(_t) 
>((_t)*CSCHED_CREDITS_PER_MSEC/MILLISECS(1))
>
>
> /*
Jan
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