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

Joerg Roedel
2020-05-08T21:36:16Z

On Fri, May 08, 2020 at 02:33:19PM -0700, Andy Lutomirski wrote:
> On Fri, May 8, 2020 at 7:40 AM Joerg Roedel <joro@8bytes.org> wrote:

> What's the maximum on other system types? It might make more sense to
> take the memory hit and pre-populate all the tables at boot so we
> never have to sync them.

Need to look it up for 5-level paging, with 4-level paging its 64 pages
to pre-populate the vmalloc area.

But that would not solve the problem on x86-32, which needs to
synchronize unmappings on the PMD level.

Joerg