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
