Messages in this thread | | | Date | Tue, 23 Jul 2013 22:20:20 +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 10:09 PM, Rakib Mullick <rakib.mullick@gmail.com> wrote: > 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.
You mean using sd == NULL rather than using update_cache_domain variable ?
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