diff options
| author | Peter Zijlstra <peterz@infradead.org> | 2013-10-07 11:29:24 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-09 14:47:53 +0200 |
| commit | 6688cc05473b36a0a3d3971e1adf1712919b32eb (patch) | |
| tree | 2305dca14e2df669b48138088bd93cf51db37721 /mm/memory.c | |
| parent | 7851a45cd3f6198bf542c30e27b330e8eeb3736c (diff) | |
mm: numa: Do not group on RO pages
And here's a little something to make sure not the whole world ends up
in a single group.
As while we don't migrate shared executable pages, we do scan/fault on
them. And since everybody links to libc, everybody ends up in the same
group.
Suggested-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Link: http://lkml.kernel.org/r/1381141781-10992-47-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 30 |
1 files changed, 26 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c index c57efa25cdb..eba846bcf12 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3547,6 +3547,7 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, int last_cpupid; int target_nid; bool migrated = false; + int flags = 0; /* * The "pte" at this point cannot be used safely without @@ -3575,6 +3576,14 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, } BUG_ON(is_zero_pfn(page_to_pfn(page))); + /* + * Avoid grouping on DSO/COW pages in specific and RO pages + * in general, RO pages shouldn't hurt as much anyway since + * they can be in shared cache state. + */ + if (!pte_write(pte)) + flags |= TNF_NO_GROUP; + last_cpupid = page_cpupid_last(page); page_nid = page_to_nid(page); target_nid = numa_migrate_prep(page, vma, addr, page_nid); @@ -3586,12 +3595,14 @@ int do_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, /* Migrate to the requested node */ migrated = migrate_misplaced_page(page, vma, target_nid); - if (migrated) + if (migrated) { page_nid = target_nid; + flags |= TNF_MIGRATED; + } out: if (page_nid != -1) - task_numa_fault(last_cpupid, page_nid, 1, migrated); + task_numa_fault(last_cpupid, page_nid, 1, flags); return 0; } @@ -3632,6 +3643,7 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, int page_nid = -1; int target_nid; bool migrated = false; + int flags = 0; if (!pte_present(pteval)) continue; @@ -3651,20 +3663,30 @@ static int do_pmd_numa_page(struct mm_struct *mm, struct vm_area_struct *vma, if (unlikely(!page)) continue; + /* + * Avoid grouping on DSO/COW pages in specific and RO pages + * in general, RO pages shouldn't hurt as much anyway since + * they can be in shared cache state. + */ + if (!pte_write(pteval)) + flags |= TNF_NO_GROUP; + last_cpupid = page_cpupid_last(page); page_nid = page_to_nid(page); target_nid = numa_migrate_prep(page, vma, addr, page_nid); pte_unmap_unlock(pte, ptl); if (target_nid != -1) { migrated = migrate_misplaced_page(page, vma, target_nid); - if (migrated) + if (migrated) { page_nid = target_nid; + flags |= TNF_MIGRATED; + } } else { put_page(page); } if (page_nid != -1) - task_numa_fault(last_cpupid, page_nid, 1, migrated); + task_numa_fault(last_cpupid, page_nid, 1, flags); pte = pte_offset_map_lock(mm, pmdp, addr, &ptl); } |