diff options
| author | Mel Gorman <mgorman@suse.de> | 2014-01-22 00:51:02 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-22 01:19:48 +0100 |
| commit | 64a9a34e22896dad430e21a28ad8cb00a756fefc (patch) | |
| tree | a2b61f7edff663bdf35d688ff160f3153c23fba4 /mm/mprotect.c | |
| parent | mm: numa: trace tasks that fail migration due to rate limiting (diff) | |
| download | linux-64a9a34e22896dad430e21a28ad8cb00a756fefc.tar.xz linux-64a9a34e22896dad430e21a28ad8cb00a756fefc.zip | |
mm: numa: do not automatically migrate KSM pages
KSM pages can be shared between tasks that are not necessarily related
to each other from a NUMA perspective. This patch causes those pages to
be ignored by automatic NUMA balancing so they do not migrate and do not
cause unrelated tasks to be grouped together.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index bb53a6591aea..7332c1785744 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -23,6 +23,7 @@ #include <linux/mmu_notifier.h> #include <linux/migrate.h> #include <linux/perf_event.h> +#include <linux/ksm.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/cacheflush.h> @@ -63,7 +64,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd, ptent = *pte; page = vm_normal_page(vma, addr, oldpte); - if (page) { + if (page && !PageKsm(page)) { if (!pte_numa(oldpte)) { ptent = pte_mknuma(ptent); set_pte_at(mm, addr, pte, ptent); |