[PATCH] madvise.2: Document MADV_FREE

[Minchan Kim]

Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
 man2/madvise.2 | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/man2/madvise.2 b/man2/madvise.2
index 032ead7..fc1aaca 100644
--- a/man2/madvise.2
+++ b/man2/madvise.2
@@ -265,6 +265,18 @@ file (see
 .BR MADV_DODUMP " (since Linux 3.4)"
 Undo the effect of an earlier
 .BR MADV_DONTDUMP .
+.TP
+.BR MADV_FREE " (since Linux 3.19)"
+Tell the kernel that contents in the specified address range are no
+longer important and the range will be overwritten. When there is
+demand for memory, the system will free pages associated with the
+specified address range. In this instance, the next time a page in the
+address range is referenced, it will contain all zeroes.  Otherwise,
+it will contain the data that was there prior to the MADV_FREE call.
+References made to the address range will not make the system read
+from backing store (swap space) until the page is modified again.
+It works only with private anonymous pages (see
+.BR mmap (2)).
 .SH RETURN VALUE
 On success
 .BR madvise ()
-- 
2.0.0

-- 
Kind regards,
Minchan Kim
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