It is now redundant after unconditional scans introduced for tasks'
disjoint VMAs.
Also this approach was not considering a rare case where a VMA gets
created after mm numa_scan_seq is greater than two.
Signed-off-by: Raghavendra K T <raghavendra.kt@xxxxxxx>
---
kernel/sched/fair.c | 8 --------
1 file changed, 8 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 23375c10f36e..e26e847a8e26 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2961,14 +2961,6 @@ static bool task_disjoint_vma_select(struct vm_area_struct *vma)
static bool vma_is_accessed(struct vm_area_struct *vma)
{
unsigned long pids;
- /*
- * Allow unconditional access first two times, so that all the (pages)
- * of VMAs get prot_none fault introduced irrespective of accesses.
- * This is also done to avoid any side effect of task scanning
- * amplifying the unfairness of disjoint set of VMAs' access.
- */
- if (READ_ONCE(current->mm->numa_scan_seq) < 2)
- return true;
pids = vma->numab_state->access_pids[0] | vma->numab_state->access_pids[1];
return test_bit(hash_32(current->pid, ilog2(BITS_PER_LONG)), &pids);
--
2.34.1
