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SubjectRe: 答复: [PATCH] arm64 : mm: fre e unused memmap for sparse memory model that define VMEMMAP
On Wed, Jul 22, 2020 at 08:41:17AM +0000, liwei (CM) wrote:
> Mike Rapoport wrote:
> > On Tue, Jul 21, 2020 at 03:32:03PM +0800, Wei Li wrote:
> > > For the memory hole, sparse memory model that define SPARSEMEM_VMEMMAP
> > > do not free the reserved memory for the page map, this patch do it.
> >
> > Are there numbers showing how much memory is actually freed?
> >
> > The freeing of empty memmap would become rather complex with these
> > changes, do the memory savings justify it?
>
> In the sparse memory model, the size of a section is 1 GB
> (SECTION_SIZE_BITS 30) by default.

Can we reduce SECTION_SIZE_BITS instead? Say 26?

--
Catalin

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