Messages in this thread | | | Subject | Re: [Lse-tech] [patch] sched-domain cleanups, sched-2.6.5-rc2-mm2-A3 | Date | Mon, 29 Mar 2004 17:26:30 -0800 | From | Rick Lindsley <> |
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This looks very cool. Very comprehensive. Have you got any plans to intergrate it with sched_domains (so for example, you can see stats for each domain)?
Yes -- ideally we can add some stats to domains too, so we can tell (for example) how often it is adjusting rebalance intervals, or how many processes are moved as a result of each domain's policy, etc. Every time I add another counter I cringe a bit, because we don't want to impose overhead in the scheduler. But so far, using per-cpu data, utilizing runqueue locking when it's in use, and accepting minor inaccuracies that may result from the remaining cases, seems to be yielding a pretty good picture of things without imposing a measurable load.
If you want to start using it yourself, I'm open to feedback. I have patches for major releases at
http://oss.software.ibm.com/linux/patches/?patch_id=730
and a host of smaller releases (like rc2-mm5) at eaglet:
http://eaglet.rain.com/rick/linux/schedstat/
If you're feeling *really* lucky I have a handful of useful but often ungeneralized tools I can share, like the the ones that made that web page.
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