[tip: sched/core] sched/numa: Rename vma_numab_state::access_pids[] => ::pids_active[], ::next_pid_reset => ::pids_active_reset

tip-bot2 for Mel Gorman
2023-10-10T09:44:12Z

The following commit has been merged into the sched/core branch of tip:

Commit-ID: f3a6c97940fbd25d6c84c2d5642338fc99a9b35b
Gitweb: https://git.kernel.org/tip/f3a6c97940fbd25d6c84c2d5642338fc99a9b35b
Author: Mel Gorman <mgorman@techsingularity.net>
AuthorDate: Tue, 10 Oct 2023 09:31:39 +01:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Tue, 10 Oct 2023 11:10:00 +02:00

sched/numa: Rename vma_numab_state::access_pids[] => ::pids_active[], ::next_pid_reset => ::pids_active_reset

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.

[ mingo: Rename in the comments too. ]

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20231010083143.19593-3-mgorman@techsingularity.net
---
include/linux/mm.h | 4 ++--
include/linux/mm_types.h | 6 +++---
kernel/sched/fair.c | 12 ++++++------
3 files changed, 11 insertions(+), 11 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index bf5d0b1..19fc73b 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 d7f042e..e7571ec 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -559,10 +559,10 @@ struct vma_numab_state {
unsigned long next_scan;

/*
- * Time in jiffies when access_pids[] is reset to
+ * Time in jiffies when pids_active[] is reset to
* detect phase change behaviour:
*/
- unsigned long next_pid_reset;
+ unsigned long pids_active_reset;

/*
* Approximate tracking of PIDs that trapped a NUMA hinting
@@ -574,7 +574,7 @@ struct vma_numab_state {
* Window moves after next_pid_reset has expired approximately
* every VMA_PID_RESET_PERIOD jiffies:
*/
- unsigned long access_pids[2];
+ unsigned long pids_active[2];
};

/*
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index e7c1baf..6b47edc 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -3125,7 +3125,7 @@ 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);
}

@@ -3241,7 +3241,7 @@ 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);
}

@@ -3262,11 +3262,11 @@ 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 {