Messages in this thread | | | Date | Wed, 16 Nov 2022 11:50:58 -0500 | From | Peter Xu <> | Subject | Re: [RFC PATCH v2 04/47] hugetlb: only adjust address ranges when VMAs want PMD sharing |
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On Fri, Oct 21, 2022 at 04:36:20PM +0000, James Houghton wrote: > Currently this check is overly aggressive. For some userfaultfd VMAs, > VMA sharing is disabled, yet we still widen the address range, which is > used for flushing TLBs and sending MMU notifiers. > > This is done now, as HGM VMAs also have sharing disabled, yet would > still have flush ranges adjusted. Overaggressively flushing TLBs and > triggering MMU notifiers is particularly harmful with lots of > high-granularity operations. > > Signed-off-by: James Houghton <jthoughton@google.com>
Acked-by: Peter Xu <peterx@redhat.com>
-- Peter Xu
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