summaryrefslogtreecommitdiff
path: root/include/asm-generic
diff options
context:
space:
mode:
authorKonstantin Weitz <konstantin.weitz@gmail.com>2013-04-17 15:59:32 +0400
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2014-02-21 11:50:18 +0400
commit45961722f8e30ceab9d135b1ddc0947d53aef7c3 (patch)
treecfc391e0bcb2958625565ebbc480fe11ef95bcaf /include/asm-generic
parent53e857f30867918b3618d8e18902e63291946ef4 (diff)
downloadlinux-45961722f8e30ceab9d135b1ddc0947d53aef7c3.tar.xz
mm: add support for discard of unused ptes
In a virtualized environment and given an appropriate interface the guest can mark pages as unused while they are free (for the s390 implementation see git commit 45e576b1c3d00206 "guest page hinting light"). For the host the unused state is a property of the pte. This patch adds the primitive 'pte_unused' and code to the host swap out handler so that pages marked as unused by all mappers are not swapped out but discarded instead, thus saving one IO for swap out and potentially another one for swap in. [ Martin Schwidefsky: patch reordering and simplification ] Signed-off-by: Konstantin Weitz <konstantin.weitz@gmail.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'include/asm-generic')
-rw-r--r--include/asm-generic/pgtable.h13
1 files changed, 13 insertions, 0 deletions
diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index 34c7bdc06014..1ec08c198b66 100644
--- a/include/asm-generic/pgtable.h
+++ b/include/asm-generic/pgtable.h
@@ -193,6 +193,19 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b)
}
#endif
+#ifndef __HAVE_ARCH_PTE_UNUSED
+/*
+ * Some architectures provide facilities to virtualization guests
+ * so that they can flag allocated pages as unused. This allows the
+ * host to transparently reclaim unused pages. This function returns
+ * whether the pte's page is unused.
+ */
+static inline int pte_unused(pte_t pte)
+{
+ return 0;
+}
+#endif
+
#ifndef __HAVE_ARCH_PMD_SAME
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
static inline int pmd_same(pmd_t pmd_a, pmd_t pmd_b)