From: Naoya Horiguchi Date: Tue, 15 Mar 2016 21:56:58 +0000 (-0700) Subject: mm/madvise: update comment on sys_madvise() X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=d7206a70af5c094446927b5dea8704f0f96303e3;p=openwrt%2Fstaging%2Fblogic.git 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 Acked-by: Michal Hocko Cc: Minchan Kim Cc: "Kirill A. Shutemov" Cc: Jason Baron Cc: Chen Gong Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- 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