Messages in this thread | | | Subject | Re: [PATCH v4 2/4] mm/sparsemem: Defer the ms->section_mem_map clearing | From | Dave Hansen <> | Date | Thu, 7 Jun 2018 15:47:05 -0700 |
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On 05/21/2018 03:15 AM, Baoquan He wrote: > In sparse_init(), if CONFIG_SPARSEMEM_ALLOC_MEM_MAP_TOGETHER=y, system > will allocate one continuous memory chunk for mem maps on one node and > populate the relevant page tables to map memory section one by one. If > fail to populate for a certain mem section, print warning and its > ->section_mem_map will be cleared to cancel the marking of being present. > Like this, the number of mem sections marked as present could become > less during sparse_init() execution. > > Here just defer the ms->section_mem_map clearing if failed to populate > its page tables until the last for_each_present_section_nr() loop. This > is in preparation for later optimizing the mem map allocation. > > Signed-off-by: Baoquan He <bhe@redhat.com>
Acked-By: Dave Hansen <dave.hansen@intel.com>
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