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authorNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>2016-03-15 14:56:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-03-15 16:55:16 -0700
commitd7206a70af5c094446927b5dea8704f0f96303e3 (patch)
tree3cf439ab82a213e8e8ea0053869e621285b7244f /mm/madvise.c
parentcecf257b62e39eab0e802e91c62ae5679673db02 (diff)
mm/madvise: update comment on sys_madvise()
Some new MADV_* advices are not documented in sys_madvise() comment. So let's update it. [akpm@linux-foundation.org: modifications suggested by Michal] Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Acked-by: Michal Hocko <mhocko@suse.com> Cc: Minchan Kim <minchan@kernel.org> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Jason Baron <jbaron@redhat.com> Cc: Chen Gong <gong.chen@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/madvise.c')
-rw-r--r--mm/madvise.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/mm/madvise.c b/mm/madvise.c
index 6a7711436c5b..a01147359f3b 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -639,14 +639,28 @@ madvise_behavior_valid(int behavior)
* some pages ahead.
* MADV_DONTNEED - the application is finished with the given range,
* so the kernel can free resources associated with it.
+ * MADV_FREE - the application marks pages in the given range as lazy free,
+ * where actual purges are postponed until memory pressure happens.
* MADV_REMOVE - the application wants to free up the given range of
* pages and associated backing store.
* MADV_DONTFORK - omit this area from child's address space when forking:
* typically, to avoid COWing pages pinned by get_user_pages().
* MADV_DOFORK - cancel MADV_DONTFORK: no longer omit this area when forking.
+ * MADV_HWPOISON - trigger memory error handler as if the given memory range
+ * were corrupted by unrecoverable hardware memory failure.
+ * MADV_SOFT_OFFLINE - try to soft-offline the given range of memory.
* MADV_MERGEABLE - the application recommends that KSM try to merge pages in
* this area with pages of identical content from other such areas.
* MADV_UNMERGEABLE- cancel MADV_MERGEABLE: no longer merge pages with others.
+ * MADV_HUGEPAGE - the application wants to back the given range by transparent
+ * huge pages in the future. Existing pages might be coalesced and
+ * new pages might be allocated as THP.
+ * MADV_NOHUGEPAGE - mark the given range as not worth being backed by
+ * transparent huge pages so the existing pages will not be
+ * coalesced into THP and new pages will not be allocated as THP.
+ * MADV_DONTDUMP - the application wants to prevent pages in the given range
+ * from being included in its core dump.
+ * MADV_DODUMP - cancel MADV_DONTDUMP: no longer exclude from core dump.
*
* return values:
* zero - success