[linux-audio-dev] Re: lowish-latency patch for 2.4.0-test9

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Subject: [linux-audio-dev] Re: lowish-latency patch for 2.4.0-test9
From: Jamie Lokier (lk_AT_tantalophile.demon.co.uk)
Date: Wed Oct 11 2000 - 20:16:33 EEST

Andrew Morton wrote:
> b): disabling local interrupts prior to the final need_resched
> check to make this test atomic wrt interrupts. RESTORE_ALL
> will do the right thing and an intervening smp_send_reschedule()
> will be blocked until the return to user space.

No need to disable interrupts. We tried it and it works, but there's a
faster way that doesn't disable interrupts. Look at Ingo Molnar's
current for 2.2 and 2.4 at

  http://people.redhat.com/mingo/lowlatency-patches/

There in i386/kernel/entry.S, look for resched_fixup et al.

-- Jamie

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