These two patches are based on top of Srikar Dronamraju's recent work on automatic NUMA balancing and are motivated by a bug report from Jirka Hladky that STREAM performance has regressed. The STREAM workload is mildly interesting in that it only works as a valid benchmark if tasks are pinned to memory channels. Otherwise it is very sensitive to the starting conditions of the benchmark. Recent scheduler changes prevent prematurely spreading a workload across multiple sockets which benefits many workloads but not STREAM. This series restores STREAM performance without reintroducing other regressions. The first patch removes migration rate limiting as it's expected that automatic NUMA balancing decisions are mature enough that we do not need the safety net. The second patch migrates pages faster early in the lifetime of the process which has an impact if the load balancer spreads a workload to remote nodes. include/linux/mmzone.h | 6 ---- include/trace/events/migrate.h | 27 ------------------ kernel/sched/fair.c | 12 +++++++- mm/migrate.c | 65 ------------------------------------------ mm/page_alloc.c | 2 -- 5 files changed, 11 insertions(+), 101 deletions(-) -- 2.16.4
