On Thu, Oct 08, 2020 at 01:41:58PM +0200, Vlastimil Babka wrote:
> pageset_update() attempts to update pcplist's high and batch values in a way
> that readers don't observe batch > high. It uses smp_wmb() to order the
> updates
> in a way to achieve this. However, without proper pairing read
pageset_update() attempts to update pcplist's high and batch values in a way
that readers don't observe batch > high. It uses smp_wmb() to order the updates
in a way to achieve this. However, without proper pairing read barriers in
readers this guarantee doesn't hold, and there are no such
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