Re: 2.6.12-rc2-mm1

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Siddha, Suresh B wrote:
On Tue, Apr 05, 2005 at 05:33:49PM +1000, Nick Piggin wrote:

Suresh's underlying problem with the unnecessary sched domains
is a failing of sched-balance-exec and sched-balance-fork, which


That wasn't the only motivation. For example, on non-HT cpu's we shouldn't
be setting up SMT sched-domain, same with NUMA domains on non-NUMA systems.


Yep, sure. It is a good, if slight, optimisation. And I've also just
slightly extended your patch, so we don't have any domains if booting
with maxcpus=1


I am working on now.

Removing unnecessary domains is a nice optimisation, but just
needs to account for a few more flags before declaring that a


Can you elaborate when we require a domain with special flags but has
no or only one group in it.


The SD_WAKE_* flags do not use groups, so it would be legitimate to
have a domain that has one of these set, with no groups.


domain is unnecessary (not to mention this probably breaks if
isolcpus= is used). I have made some modifications to the patch


I have tested my patch with "ioslcpus=" and it works just fine.


OK, my apologies ;)


to fix these problems.

Lastly, I'd like to be a bit less intrusive with pinned task
handling improvements. I think we can do this while still being
effective in preventing livelocks.


We want to see this fixed. Please post your patch and I can let you know
the test results.


I will try to get it working and tested tonight for you.


I will keep you posted with regards to the various scheduler
patches.


Nick, Can you post the patches you sent me earlier to this list?


Yep, I'll post them.


--
SUSE Labs, Novell Inc.

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