Messages in this thread | | | Date | Mon, 24 Jun 2019 15:09:50 +0100 | From | Mel Gorman <> | Subject | Re: [PATCH -mm] autonuma: Fix scan period updating |
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On Mon, Jun 24, 2019 at 10:56:04AM +0800, Huang Ying wrote: > The autonuma scan period should be increased (scanning is slowed down) > if the majority of the page accesses are shared with other processes. > But in current code, the scan period will be decreased (scanning is > speeded up) in that situation. > > This patch fixes the code. And this has been tested via tracing the > scan period changing and /proc/vmstat numa_pte_updates counter when > running a multi-threaded memory accessing program (most memory > areas are accessed by multiple threads). >
The patch somewhat flips the logic on whether shared or private is considered and it's not immediately obvious why that was required. That aside, other than the impact on numa_pte_updates, what actual performance difference was measured and on on what workloads?
-- Mel Gorman SUSE Labs
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