Messages in this thread | | | Date | Wed, 17 Feb 2021 21:16:12 +0000 | From | Matthew Wilcox <> | Subject | Re: [RFC 1/2] mm: disable LRU pagevec during the migration temporarily |
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On Wed, Feb 17, 2021 at 12:46:19PM -0800, Minchan Kim wrote: > > I suspect you do not want to add atomic_read inside hot paths, right? Is > > this really something that we have to microoptimize for? atomic_read is > > a simple READ_ONCE on many archs. > > It's also spin_lock_irq_save in some arch. If the new synchonization is > heavily compilcated, atomic would be better for simple start but I thought > this locking scheme is too simple so no need to add atomic operation in > readside.
What arch uses a spinlock for atomic_read()? I just had a quick grep and didn't see any.
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