Re: 答复: [PATCH] arm64: mm: free unused memmap for sparse memory model that define VMEMMAP
From: Catalin Marinas <catalin.marinas@arm.com>
Date: 2020-07-22 12:49:17
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On Wed, Jul 22, 2020 at 08:41:17AM +0000, liwei (CM) wrote:
Mike Rapoport wrote:quoted
On Tue, Jul 21, 2020 at 03:32:03PM +0800, Wei Li wrote:quoted
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel