[patch] voluntary-preempt-2.6.8.1-P0

Ingo Molnar
2004-08-15T11:55:23Z

i've uploaded the -P0 patch:

http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8.1-P0

those who had APIC (and USB, under SMP) problems under previous
versions, are the problems still present in -P0?

Changes:

- make redirected softirqs and hardirqs preemptible by default. I
reviewed a number of softirq users and it appears to be safe.
Process-level enable/disable_bh still disables preemption, but the
handlers themselves run in a preemptible way. This preemptability
should fix e.g. the IDE latencies. It could also fix some of the
/dev/random related latencies.

- fixed a bug in hardirq redirection - we didnt re-disable interrupts

- updated the IO-APIC changes - hopefully it's more robust now

Ingo