Messages in this thread | | | Date | Tue, 23 Jul 2013 22:09:00 +0600 | Subject | Re: [PATCH, RFC] sched: update_top_cache_domain only at the times of building sched domain. | From | Rakib Mullick <> |
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On Tue, Jul 23, 2013 at 9:47 PM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, Jul 23, 2013 at 09:44:17PM +0600, Rakib Mullick wrote: >> Currently, update_top_cache_domain() is called whenever schedule domain is built or destroyed. But, the following >> callpath shows that they're at the same callpath and can be avoided update_top_cache_domain() while destroying schedule >> domain and update only at the times of building schedule domains. >> >> partition_sched_domains() >> detach_destroy_domain() >> cpu_attach_domain() >> update_top_cache_domain() >> build_sched_domains() >> cpu_attach_domain() >> update_top_cache_domain() >> > > Does it really matter?
Why should we do it twice? More importantly at the time of destroying even though we know it'll be built again just few moment later.
> > > This just makes the code uglier for no gain afaict. > > If you really need to do this, key off @sd == NULL or something.
Sorry, would you please a bit more clearer? I can't pick what you're suggesting.
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