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Yet to find perf diff on > will-it-scale, so not included here. Plan to run more workloads. > 2. add tracepoint. > 3. To peterz's comment, this will make it impossible to attract tasks to > those memory just like other VMA skippings. This is the current > implementation, I think we can improve that in the future, but at the > moment it's probabaly better to keep it consistent. I tested the series with hackbench running on a dual socket system with memory pinned to one node and I could see the skip_cpuset_numa traces being logged: sched-messaging-9430 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9430 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9640 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9640 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9645 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9645 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9637 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9637 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9629 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9629 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9639 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9639 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9630 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9630 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9487 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9487 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9635 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9635 tgid=9007 ngid=0 mem_nodes_allowed=0 sched-messaging-9647 ...: sched_skip_cpuset_numa: comm=sched-messaging pid=9647 tgid=9007 ngid=0 mem_nodes_allowed=0 ... Feel free to add: Tested-by: K Prateek Nayak -- Thanks and Regards, Prateek > > v2->v3: > 1. add enable_cpuset() based on Mel's suggestion but again I think it's > redundant. > 2. print out nodemask with %*p.. format in the tracepoint. > > v3->v4: > 1. fix an unsafe dereference of a pointer to content not on ring buffer, > namely mem_allowed_ptr in the tracepoint. > > v4->v5: > 1. add BUILD_BUG_ON() in TP_fast_assign() to guard against future > changes (particularly in size) in nodemask_t. > > Libo Chen (2): > sched/numa: Skip VMA scanning on memory pinned to one NUMA node via > cpuset.mems > sched/numa: Add tracepoint that tracks the skipping of numa balancing > due to cpuset memory pinning > > include/trace/events/sched.h | 33 +++++++++++++++++++++++++++++++++ > kernel/sched/fair.c | 9 +++++++++ > 2 files changed, 42 insertions(+) >