Messages in this thread | | | Date | Wed, 8 Feb 2017 13:56:53 +0100 | From | Michal Hocko <> | Subject | Re: [RFC PATCH] mm: move pcp and lru-pcp drainging into vmstat_wq |
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On Wed 08-02-17 21:44:36, Tetsuo Handa wrote: > Mel Gorman wrote: > > > > It also feels like vmstat is now a misleading name for something that > > > > handles vmstat, lru drains and per-cpu drains but that's cosmetic. > > > > > > yeah a better name sounds like a good thing. mm_nonblock_wq? > > > > > > > it's not always non-blocking. Maybe mm_percpu_wq to describev a workqueue > > that handles a variety of MM-related per-cpu updates? > > > > Why not make it global like ones created by workqueue_init_early() ?
I can see alloc_workqueue_attrs in that path so we can hit the page allocator and if unlucky try to drain_all_pages. We might have more even before this. So I think we still need a check for the WQ being initialized already. I do not have a strong preference to when to allocate it. Moving the initialization out to workqueue_init_early wold mean that the WQ would have to be visible outside of the mm proper which is not ideal. We can live with that, though, so I will move it there if this is a prevalent opinion. -- Michal Hocko SUSE Labs
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