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author | Mel Gorman <mgorman@techsingularity.net> | 2023-10-10 09:31:38 +0100 |
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committer | Ingo Molnar <mingo@kernel.org> | 2023-10-10 11:10:00 +0200 |
commit | 9ae5c00ea2e600a8b823f9b95606dd244f3096bf (patch) | |
tree | 9e51209579030dfaf1b74ce40fc975a2bd844649 | |
parent | f2273f4e19e29f7d0be6a2393f18369cd1b496c8 (diff) | |
download | linux-stable-9ae5c00ea2e600a8b823f9b95606dd244f3096bf.tar.gz linux-stable-9ae5c00ea2e600a8b823f9b95606dd244f3096bf.tar.bz2 linux-stable-9ae5c00ea2e600a8b823f9b95606dd244f3096bf.zip |
sched/numa: Document vma_numab_state fields
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
-rw-r--r-- | include/linux/mm_types.h | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index 36c5b43999e6..d7f042ec1f33 100644 --- a/include/linux/mm_types.h +++ b/include/linux/mm_types.h @@ -551,8 +551,29 @@ struct vma_lock { }; 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; + + /* + * Time in jiffies when access_pids[] is reset to + * detect phase change behaviour: + */ 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]; }; |