Re: [RFC PATCH 0/7] mm: Get rid of vmalloc_sync_(un)mappings()

[Peter Zijlstra]

On Sat, May 09, 2020 at 06:11:57PM -0700, Matthew Wilcox wrote:
> Iterating an XArray (whether the entire thing
> or with marks) is RCU-safe and faster than iterating a linked list,
> so this should solve the problem?

It can hardly be faster if you want all elements -- which is I think the
case here. We only call into this if we change an entry, and then we
need to propagate that change to all.