Hi, Any comments please? ;) On 2021/12/6 10:45, Gang Li wrote:
This patch add a new api PR_NUMA_BALANCING in prctl. A large number of page faults will cause performance loss when numa balancing is performing. Thus those processes which care about worst-case performance need numa balancing disabled. Others, on the contrary, allow a temporary performance loss in exchange for higher average performance, so enable numa balancing is better for them. Numa balancing can only be controlled globally by /proc/sys/kernel/numa_balancing. Due to the above case, we want to disable/enable numa_balancing per-process instead. Add numa_balancing under mm_struct. Then use it in task_tick_fair. Set per-process numa balancing: prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DISABLE); //disable prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_ENABLE); //enable prctl(PR_NUMA_BALANCING, PR_SET_NUMAB_DEFAULT); //follow global Get numa_balancing state: prctl(PR_NUMA_BALANCING, PR_GET_NUMAB, &ret); cat /proc/<pid>/status | grep NumaB_enabled Cc: linux-api@xxxxxxxxxxxxxxx Signed-off-by: Gang Li <ligang.bdlg@xxxxxxxxxxxxx> --- Changes in v3: - Fix compile error. Changes in v2: - Now PR_NUMA_BALANCING support three states: enabled, disabled, default. enabled and disabled will ignore global setting, and default will follow global setting.
-- Thanks Gang Li
