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Commit d7206a70 authored by Naoya Horiguchi's avatar Naoya Horiguchi Committed by Linus Torvalds
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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: default avatarNaoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: default avatarMichal 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent cecf257b

mm/madvise.c

+14 −0
Original line number Diff line number Diff line
@@ -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