Messages in this thread | | | Date | Mon, 11 Apr 2022 20:08:00 +0100 | From | Matthew Wilcox <> | Subject | Re: [PATCH v1 00/14] Add support for shared PTEs across processes |
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On Mon, Apr 11, 2022 at 11:51:46AM -0700, Dave Hansen wrote: > On 4/11/22 10:37, Matthew Wilcox wrote: > > Another argument that MM developers find compelling is that we can reduce > > some of the complexity in hugetlbfs where it has the ability to share > > page tables between processes. > > When could this complexity reduction actually happen in practice? Can > this mshare thingy be somehow dropped in underneath the existing > hugetlbfs implementation? Or would userspace need to change?
Userspace needs to opt in to mshare, so there's going to be a transition period where we still need hugetlbfs to still support it, but I have the impression that the users that need page table sharing are pretty specialised and we'll be able to find them all before disabling it.
I don't think we can make it transparent to userspace, but I'll noodle on that a bit.
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