Currently, an imbalance is only allowed when a destination node is almost completely idle. This solved one basic class of problems and was the cautious approach. This patch revisits the possibility that NUMA nodes can be imbalanced until 25% of the CPUs are occupied. The reasoning behind 25% is somewhat superficial -- it's half the cores when HT is enabled. At higher utilisations, balancing should continue as normal and keep things even until scheduler domains are fully busy or over utilised. Note that this is not expected to be a universal win. Any benchmark that prefers spreading as wide as possible with limited communication will favour the old behaviour as there is more memory bandwidth. Workloads that communicate heavily in pairs such as netperf or tbench benefit. For the tests I ran, the vast majority of workloads saw a benefit so it seems to be a worthwhile trade-off.
Unified · Split
| @@ -1559,7 +1559,8 @@ struct task_numa_env { · 1558 unmodified lines | |||
| 1559 | static unsigned long cpu_load(struct rq *rq); | 1559 | static unsigned long cpu_load(struct rq *rq); |
| 1560 | static unsigned long cpu_runnable(struct rq *rq); | 1560 | static unsigned long cpu_runnable(struct rq *rq); |
| 1561 | static unsigned long cpu_util(int cpu); | 1561 | static unsigned long cpu_util(int cpu); |
| 1562 | static inline long adjust_numa_imbalance(int imbalance, int dst_running); | 1562 | static inline long adjust_numa_imbalance(int imbalance, |
| 1563 | int dst_running, int dst_weight); | ||
| 1563 | 1564 | ||
| 1564 | static inline enum | 1565 | static inline enum |
| 1565 | numa_type numa_classify(unsigned int imbalance_pct, | 1566 | numa_type numa_classify(unsigned int imbalance_pct, |
| @@ -1939,7 +1940,8 @@ static void task_numa_find_cpu(struct task_numa_env *env, · 373 unmodified lines | |||
| 1939 | src_running = env->src_stats.nr_running - 1; | 1940 | src_running = env->src_stats.nr_running - 1; |
| 1940 | dst_running = env->dst_stats.nr_running + 1; | 1941 | dst_running = env->dst_stats.nr_running + 1; |
| 1941 | imbalance = max(0, dst_running - src_running); | 1942 | imbalance = max(0, dst_running - src_running); |
| 1942 | imbalance = adjust_numa_imbalance(imbalance, dst_running); | 1943 | imbalance = adjust_numa_imbalance(imbalance, dst_running, |
| 1944 | env->dst_stats.weight); | ||
| 1943 | 1945 | ||
| 1944 | /* Use idle CPU if there is no imbalance */ | 1946 | /* Use idle CPU if there is no imbalance */ |
| 1945 | if (!imbalance) { | 1947 | if (!imbalance) { |
| @@ -8995,16 +8997,14 @@ next_group: · 7049 unmodified lines | |||
| 8995 | 8997 | ||
| 8996 | #define NUMA_IMBALANCE_MIN 2 | 8998 | #define NUMA_IMBALANCE_MIN 2 |
| 8997 | 8999 | ||
| 8998 | static inline long adjust_numa_imbalance(int imbalance, int dst_running) | 9000 | static inline long adjust_numa_imbalance(int imbalance, |
| 9001 | int dst_running, int dst_weight) | ||
| 8999 | { | 9002 | { |
| 9000 | unsigned int imbalance_min; | ||
| 9001 | |||
| 9002 | /* | 9003 | /* |
| 9003 | * Allow a small imbalance based on a simple pair of communicating | 9004 | * Allow a small imbalance based on a simple pair of communicating |
| 9004 | * tasks that remain local when the source domain is almost idle. | 9005 | * tasks that remain local when the destination is lightly loaded. |
| 9005 | */ | 9006 | */ |
| 9006 | imbalance_min = NUMA_IMBALANCE_MIN; | 9007 | if (dst_running < (dst_weight >> 2) && imbalance <= NUMA_IMBALANCE_MIN) |
| 9007 | if (dst_running <= imbalance_min) | ||
| 9008 | return 0; | 9008 | return 0; |
| 9009 | 9009 | ||
| 9010 | return imbalance; | 9010 | return imbalance; |
| @@ -9106,9 +9106,10 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s · 95 unmodified lines | |||
| 9106 | } | 9106 | } |
| 9107 | 9107 | ||
| 9108 | /* Consider allowing a small imbalance between NUMA groups */ | 9108 | /* Consider allowing a small imbalance between NUMA groups */ |
| 9109 | if (env->sd->flags & SD_NUMA) | 9109 | if (env->sd->flags & SD_NUMA) { |
| 9110 | env->imbalance = adjust_numa_imbalance(env->imbalance, | 9110 | env->imbalance = adjust_numa_imbalance(env->imbalance, |
| 9111 | busiest->sum_nr_running); | 9111 | busiest->sum_nr_running, busiest->group_weight); |
| 9112 | } | ||
| 9112 | 9113 | ||
| 9113 | return; | 9114 | return; |
| 9114 | } | 9115 | } |