Paul Jackson wrote:
Robin wrote:
Could this be as simple as a CPU_UP_PREPARE or CPU_DOWN_PREPARE
removing all the cpu_exclusive cpusets and a CPU_UP_CANCELLED,
CPU_DOWN_CANCELLED, CPU_ONLINE, CPU_DEAD going through and
partitioning all the cpu_exclusive cpusets.
Perhaps.
The somewhat related problems, in my book, are:
1) I don't know how to tell what sched domains/groups a system has, nor
how to tell my customers how to see what sched domains they have, and
I don't know if you want customers do know what domains they have. I think
you should avoid having explicit control over sched-domains in your cpusets
completely, and just have the cpusets create partitioned domains whenever
it can.
2) I suspect that Mr. Cpusets doesn't understand sched domains and that
Mr. Sched Domain doesn't understand cpusets, and that we've ended
up with some inscrutable and likely unsuitable interactions between
the two as a result, which in particular don't result in cpusets
driving the sched domain configuration in the desired ways for some
of the less trivial configs.
Well ... at least the first suspcicion above is a near certainty ;).
cpusets is the only thing that messes with sched-domains (excluding the
isolcpus -- that seems to require a small change to partition_sched_domains,
but forget that for now).
And so you should know what partitioning to build at any point when asked.
So we could have a call to cpusets at the end of arch_init_sched_domains,
which asks for the domains to be partitioned, no?
--
SUSE Labs, Novell Inc.
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