6.6-stable review patch. If anyone has any objections, please let me know.
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From: Mel Gorman mgorman@techsingularity.net
[ Upstream commit 9ae5c00ea2e600a8b823f9b95606dd244f3096bf ]
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: f22cde4371f3 ("sched/numa: Fix the vma scan starving issue") Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/mm_types.h | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+)
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h index ba25777ec0a71..b53a13d15bbae 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]; };