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