diff options
| author | Mel Gorman <mgorman@techsingularity.net> | 2023-10-10 09:31:42 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2023-10-10 23:41:47 +0200 |
| commit | b7a5b537c55c088d891ae554103d1b281abef781 (patch) | |
| tree | c241efff414124021a2eb614afde84aeb2980340 /include/linux/sched | |
| parent | 2e2675db1906ac04809f5399bf1f5e30d56a6f3e (diff) | |
sched/numa: Complete scanning of partial VMAs regardless of PID activity
NUMA Balancing skips VMAs when the current task has not trapped a NUMA
fault within the VMA. If the VMA is skipped then mm->numa_scan_offset
advances and a task that is trapping faults within the VMA may never
fully update PTEs within the VMA.
Force tasks to update PTEs for partially scanned PTEs. The VMA will
be tagged for NUMA hints by some task but this removes some of the
benefit of tracking PID activity within a VMA. A follow-on patch
will mitigate this problem.
The test cases and machines evaluated did not trigger the corner case so
the performance results are neutral with only small changes within the
noise from normal test-to-test variance. However, the next patch makes
the corner case easier to trigger.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Tested-by: Raghavendra K T <raghavendra.kt@amd.com>
Link: https://lore.kernel.org/r/20231010083143.19593-6-mgorman@techsingularity.net
Diffstat (limited to 'include/linux/sched')
| -rw-r--r-- | include/linux/sched/numa_balancing.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sched/numa_balancing.h b/include/linux/sched/numa_balancing.h index c127a1509e2f..7dcc0bdfddbb 100644 --- a/include/linux/sched/numa_balancing.h +++ b/include/linux/sched/numa_balancing.h @@ -21,6 +21,7 @@ enum numa_vmaskip_reason { NUMAB_SKIP_INACCESSIBLE, NUMAB_SKIP_SCAN_DELAY, NUMAB_SKIP_PID_INACTIVE, + NUMAB_SKIP_IGNORE_PID, }; #ifdef CONFIG_NUMA_BALANCING |