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author | Mel Gorman <mgorman@suse.de> | 2012-11-14 18:34:32 +0000 |
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committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 14:42:46 +0000 |
commit | 9f40604cdab935e80db57b309c48659de349d4e6 (patch) | |
tree | 72f77bdb7d8ab07e4db4323642db7c04eca8e9e9 | |
parent | 6e5fb223e89dbe5cb5c563f8d4a4a0a7d62455a8 (diff) | |
download | linux-stable-9f40604cdab935e80db57b309c48659de349d4e6.tar.gz linux-stable-9f40604cdab935e80db57b309c48659de349d4e6.tar.bz2 linux-stable-9f40604cdab935e80db57b309c48659de349d4e6.zip |
sched, numa, mm: Count WS scanning against present PTEs, not virtual memory ranges
By accounting against the present PTEs, scanning speed reflects the
actual present (mapped) memory.
Suggested-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@suse.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
-rw-r--r-- | kernel/sched/fair.c | 36 |
1 files changed, 21 insertions, 15 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 0a349dd1fa60..f6e1f25ed2bd 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_numa_balancing_scan_size; - length <<= 20; + start = mm->numa_scan_offset; + pages = sysctl_numa_balancing_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); |