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Message
From: Matjaz Breskvar<phoenix@o...>
Date: Mon Mar 28 00:56:36 CEST 2005
Subject: [openrisc] [or1ksim #33] Revamp the scheduler
* György 'nog' Jeney (nog@s...) wrote:
> Hi,
>
> This patch revamps the scheduler. This is needed so that I don't need to
> compare 64-bits in the recompiler after each instruction. This is done by
> storeing how many cycles are still outstanding to run the next job. The number
> of outsanding cycles are stored as 32-bit numbers but a time-out of 2147483648
> cycles is long enough.
>
> Since every single call to SCHED_ADD added a magic number to runtime.sim.cycles
> I changed the interface to only require the time-out number (which just leads to
> a simpler interface).
>
> I also changed the interface to a linked list implementation. In the old code
> if you were running some number of peripherals the implementation reduced to
> shift-all, which is simply put sub optimal.
>
> ChangeLog:
> * Change scheduler to count down to 0 instead of reaching a certain cycle
> count.
> * Change the SCHED_ADD interface to take a time out as the parameter instead of
> the number of cycles.
accepted.
> - SCHED_ADD( dma_channel_clock, channel, runtime.sim.cycles + 1 );
> + SCHED_ADD( dma_channel_clock, channel, 1 );
the only thing left to desire is configurable delay for
each peripheral, but let's not go into details till we
finish the integration...
> - SCHED_ADD( dma_channel_clock, channel, runtime.sim.cycles + 1 );
> + SCHED_ADD( dma_channel_clock, channel, dma_delay );
best regards,
p.
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