Re: [PATCH v17 1/7] mm: support madvise(MADV_FREE)
From: Michal Hocko <hidden>
Date: 2014-12-05 08:32:56
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linux-mm, lkml
On Fri 05-12-14 16:08:16, Minchan Kim wrote: [...]
From cfa212d4fb307ae772b08cf564cab7e6adb8f4fc Mon Sep 17 00:00:00 2001 From: Minchan Kim <minchan@kernel.org> Date: Mon, 1 Dec 2014 08:53:55 +0900 Subject: [PATCH] madvise.2: Document MADV_FREE Signed-off-by: Minchan Kim <minchan@kernel.org>
Reviewed-by: Michal Hocko <redacted> Thanks!
quoted hunk ↗ jump to hunk
--- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
-- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>