Subject: [linux-audio-dev] Re: low-latency scheduling patch for 2.4.0
From: Andrew Morton (andrewm_AT_uow.edu.au)
Date: Sun Jan 14 2001 - 13:35:51 EET
Andrew Morton wrote:
>
> A patch against kernel 2.4.0 final which provides low-latency
> scheduling is at
>
> http://www.uow.edu.au/~andrewm/linux/schedlat.html#downloads
>
This has been updated for 2.4.1-pre3
- Fixed latency problems with some /proc files and forking
when many files are open.
- Fixed the tcp-minisocks thing.
- The patch now works properly on SMP.
If a wakeup is directed to a SCHED_FIFO or SCHED_RR
task then we request a reschedule on *all* non-idle
CPUs.
This causes any CPU which is holding a long-lived
spinlock to bale out, allowing the target CPU to
acquire the spinlock and then reschedule normally.
Bit of a hack, but it works very well and there
is no impact on the system unless there are
non-SCHED_OTHER tasks running.
Five lines of code :)
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