[PATCH 2/6] sched/numa: Rename vma_numab_state.access_pids

Mel Gorman
2023-10-10T08:41:46Z

The access_pids field name is somewhat ambiguous as no PIDs are accessed.
Similarly, it's not clear that next_pid_reset is related to access_pids.
Rename the fields to more accurately reflect their purpose.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
---
include/linux/mm.h | 4 ++--
include/linux/mm_types.h | 4 ++--
kernel/sched/fair.c | 12 ++++++------
3 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1b16f4..19fc73b02c9f 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1726,8 +1726,8 @@ static inline void vma_set_access_pid_bit(struct vm_area_struct *vma)
unsigned int pid_bit;

pid_bit = hash_32(current->pid, ilog2(BITS_PER_LONG));
- if (vma->numab_state && !test_bit(pid_bit, &vma->numab_state->access_pids[1])) {
- __set_bit(pid_bit, &vma->numab_state->access_pids[1]);
+ if (vma->numab_state && !test_bit(pid_bit, &vma->numab_state->pids_active[1])) {
+ __set_bit(pid_bit, &vma->numab_state->pids_active[1]);
}
}
#else /* !CONFIG_NUMA_BALANCING */
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0fe054afc4d6..8cb1dec3e358 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -558,12 +558,12 @@ struct vma_numab_state {
* least
* sysctl_numa_balancing_scan_delay
*/
- unsigned long next_pid_reset; /* Time in jiffies when
+ unsigned long pids_active_reset; /* Time in jiffies when
* access_pids is reset to
* detect phase change
* behaviour.
*/
- unsigned long access_pids[2]; /* Approximate tracking of PIDS
+ unsigned long pids_active[2]; /* Approximate tracking of PIDS
* that trapped a NUMA hinting
* fault. May produce false
* positives due to hash
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index cb225921bbca..81405627b9ed 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3142,7 +3142,7 @@ static bool vma_is_accessed(struct vm_area_struct *vma)
if (READ_ONCE(current->mm->numa_scan_seq) < 2)
return true;

- pids = vma->numab_state->access_pids[0] | vma->numab_state->access_pids[1];
+ pids = vma->numab_state->pids_active[0] | vma->numab_state->pids_active[1];
return test_bit(hash_32(current->pid, ilog2(BITS_PER_LONG)), &pids);
}

@@ -3258,7 +3258,7 @@ static void task_numa_work(struct callback_head *work)
msecs_to_jiffies(sysctl_numa_balancing_scan_delay);

/* Reset happens after 4 times scan delay of scan start */
- vma->numab_state->next_pid_reset = vma->numab_state->next_scan +
+ vma->numab_state->pids_active_reset = vma->numab_state->next_scan +
msecs_to_jiffies(VMA_PID_RESET_PERIOD);
}

@@ -3279,11 +3279,11 @@ static void task_numa_work(struct callback_head *work)
* vma for recent access to avoid clearing PID info before access..
*/
if (mm->numa_scan_seq &&
- time_after(jiffies, vma->numab_state->next_pid_reset)) {
- vma->numab_state->next_pid_reset = vma->numab_state->next_pid_reset +
+ time_after(jiffies, vma->numab_state->pids_active_reset)) {
+ vma->numab_state->pids_active_reset = vma->numab_state->pids_active_reset +
msecs_to_jiffies(VMA_PID_RESET_PERIOD);
- vma->numab_state->access_pids[0] = READ_ONCE(vma->numab_state->access_pids[1]);
- vma->numab_state->access_pids[1] = 0;
+ vma->numab_state->pids_active[0] = READ_ONCE(vma->numab_state->pids_active[1]);
+ vma->numab_state->pids_active[1] = 0;
}

do {
--
2.35.3