Messages in this thread | | | Subject | Re: [PATCH 06/10] mm: vmscan: demote anon DRAM pages to PMEM node | From | Dave Hansen <> | Date | Wed, 27 Mar 2019 10:05:48 -0700 |
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On 3/27/19 10:00 AM, Zi Yan wrote: > I ask this because I observe that migrating a list of pages can > achieve higher throughput compared to migrating individual page. > For example, migrating 512 4KB pages can achieve ~750MB/s > throughput, whereas migrating one 4KB page might only achieve > ~40MB/s throughput. The experiments were done on a two-socket > machine with two Xeon E5-2650 v3 @ 2.30GHz across the QPI link.
What kind of migration?
If you're talking about doing sys_migrate_pages() one page at a time, that's a world away from doing something inside of the kernel one page at a time.
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