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sched/numa: Document vma_numab_state fields

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[ Upstream commit 9ae5c00ea2 ]

Document the intended usage of the fields.

[ mingo: Reformatted to take less vertical space & tidied it up. ]

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231010083143.19593-2-mgorman@techsingularity.net
Stable-dep-of: f22cde4371 ("sched/numa: Fix the vma scan starving issue")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Mel Gorman 2023-10-10 09:31:38 +01:00 committed by Greg Kroah-Hartman
parent faeff8b1ee
commit ba4eb7f258
1 changed files with 21 additions and 0 deletions
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21
include/linux/mm_types.h
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@ -551,8 +551,29 @@ struct vma_lock {
}; };
struct vma_numab_state { struct vma_numab_state {
/*
* Initialised as time in 'jiffies' after which VMA
* should be scanned. Delays first scan of new VMA by at
* least sysctl_numa_balancing_scan_delay:
*/
unsigned long next_scan; unsigned long next_scan;
/*
* Time in jiffies when access_pids[] is reset to
* detect phase change behaviour:
*/
unsigned long next_pid_reset; unsigned long next_pid_reset;
/*
* Approximate tracking of PIDs that trapped a NUMA hinting
* fault. May produce false positives due to hash collisions.
*
* [0] Previous PID tracking
* [1] Current PID tracking
*
* Window moves after next_pid_reset has expired approximately
* every VMA_PID_RESET_PERIOD jiffies:
*/
unsigned long access_pids[2]; unsigned long access_pids[2];
}; };