By accounting against the present PTEs, scanning speed reflects the
actual present (mapped) memory.
Suggested-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Linus Torvalds <torva...@linux-foundation.org>
Cc: Andrew Morton <a...@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Andrea Arcangeli <aarca...@redhat.com>
Cc: Rik van Riel <r...@redhat.com>
Cc: Mel Gorman <mgor...@suse.de>
Signed-off-by: Ingo Molnar <mi...@kernel.org>
Signed-off-by: Mel Gorman <mgor...@suse.de>
---
kernel/sched/fair.c | 36 +++++++++++++++++++++---------------
1 file changed, 21 insertions(+), 15 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 66d8bd2..773ef97 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -827,8 +827,8 @@ void task_numa_work(struct callback_head *work)
struct task_struct *p = current;
struct mm_struct *mm = p->mm;
struct vm_area_struct *vma;
- unsigned long offset, end;
- long length;
+ unsigned long start, end;
+ long pages;
WARN_ON_ONCE(p != container_of(work, struct task_struct, numa_work));
@@ -858,18 +858,20 @@ void task_numa_work(struct callback_head *work)
if (cmpxchg(&mm->numa_next_scan, migrate, next_scan) != migrate)
return;
- offset = mm->numa_scan_offset;
- length = sysctl_balance_numa_scan_size;
- length <<= 20;
+ start = mm->numa_scan_offset;
+ pages = sysctl_balance_numa_scan_size;
+ pages <<= 20 - PAGE_SHIFT; /* MB in pages */
+ if (!pages)
+ return;
down_read(&mm->mmap_sem);
- vma = find_vma(mm, offset);
+ vma = find_vma(mm, start);
if (!vma) {
reset_ptenuma_scan(p);
- offset = 0;
+ start = 0;
vma = mm->mmap;
}
- for (; vma && length > 0; vma = vma->vm_next) {
+ for (; vma; vma = vma->vm_next) {
if (!vma_migratable(vma))
continue;
@@ -877,15 +879,19 @@ void task_numa_work(struct callback_head *work)
if (((vma->vm_end - vma->vm_start) >> PAGE_SHIFT) <
HPAGE_PMD_NR)
continue;
- offset = max(offset, vma->vm_start);
- end = min(ALIGN(offset + length, HPAGE_SIZE), vma->vm_end);
- length -= end - offset;
-
- change_prot_numa(vma, offset, end);
+ do {
+ start = max(start, vma->vm_start);
+ end = ALIGN(start + (pages << PAGE_SHIFT), HPAGE_SIZE);
+ end = min(end, vma->vm_end);
+ pages -= change_prot_numa(vma, start, end);
- offset = end;
+ start = end;
+ if (pages <= 0)
+ goto out;
+ } while (end != vma->vm_end);
}
+out:
/*
* It is possible to reach the end of the VMA list but the last few
VMAs are
* not guaranteed to the vma_migratable. If they are not, we would find
the
@@ -893,7 +899,7 @@ void task_numa_work(struct callback_head *work)
* so check it now.
*/
if (vma)
- mm->numa_scan_offset = offset;
+ mm->numa_scan_offset = start;
else
reset_ptenuma_scan(p);
up_read(&mm->mmap_sem);
--
1.7.9.2
--
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