On Sat, 20 Jan 2007, Jeff Roberson wrote:
jeff 2007-01-20 09:03:43 UTC
FreeBSD src repository
Modified files:
sys/kern sched_ule.c
Log:
- In tdq_transfer() always set NEEDRESCHED when necessary regardless of
the ipi settings. If NEEDRESCHED is set and an ipi is later delivered
it will clear it rather than cause extra context switches. However, if
we miss setting it we can have terrible latency.
- In sched_bind() correctly implement bind. Also be slightly more
tolerant of code which calls bind multiple times. However, we don't
change binding if another call is made with a different cpu. This
does not presently work with hwpmc which I believe should be changed.
sched_bind() appears not to be documented in scheduler(9), and the semantics
you describe (bind requiring an unbind before a thread can be bound again)
sound like something it would be useful to document, especially as schedulers
differ on what is allowed?
Robert N M Watson
Computer Laboratory
University of Cambridge
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