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With this change, there will be no >> more unnecessary PTE updates or page faults in this scenario. >> >> We have seen up to a 6x improvement on a typical java workload running on >> VMs with memory and CPU pinned to one NUMA node via cpuset in a two-socket >> AARCH64 system. With the same pinning, on a 18-cores-per-socket Intel >> platform, we have seen 20% improvment in a microbench that creates a >> 30-vCPU selftest KVM guest with 4GB memory, where each vCPU reads 4KB >> pages in a fixed number of loops. >> >> Signed-off-by: Libo Chen >> --- >> kernel/sched/fair.c | 7 +++++++ >> 1 file changed, 7 insertions(+) >> >> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c >> index e43993a4e5807..6f405e00c9c7e 100644 >> --- a/kernel/sched/fair.c >> +++ b/kernel/sched/fair.c >> @@ -3329,6 +3329,13 @@ static void task_numa_work(struct callback_head *work) >> if (p->flags & PF_EXITING) >> return; >> >> + /* >> + * Memory is pinned to only one NUMA node via cpuset.mems, naturally >> + * no page can be migrated. >> + */ >> + if (nodes_weight(cpuset_current_mems_allowed) == 1) >> + return; >> + > > Check cpusets_enabled() first? > Hi Mel, Yeah, can add that but isn't a bit redundant since nodes_weight(cpuset_current_mems_allowed) will just return #nodes which doesn't equal to 1 when !cpusets_enabled() and there are >= 2 numa nodes? Libo