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Message-Id: <1417567367-9298-3-git-send-email-mgorman@suse.de> Date: Wed, 3 Dec 2014 00:42:47 +0000 From: Mel Gorman <mgorman@...e.de> To: Andrew Morton <akpm@...ux-foundation.org>, Michael Kerrisk <mtk.manpages@...il.com> Cc: Linux-MM <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>, Mel Gorman <mgorman@...e.de> Subject: [PATCH 2/2] posix_fadvise.2: Document the behaviour of partial page discard requests It is not obvious from the interface that partial page discard requests are ignored. It should be spelled out. Signed-off-by: Mel Gorman <mgorman@...e.de> --- man2/posix_fadvise.2 | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/man2/posix_fadvise.2 b/man2/posix_fadvise.2 index 25d0c50..07313a9 100644 --- a/man2/posix_fadvise.2 +++ b/man2/posix_fadvise.2 @@ -144,6 +144,11 @@ A program may periodically request the kernel to free cached data that has already been used, so that more useful cached pages are not discarded instead. +Requests to discard partial pages are ignored. It is preferable to preserve +needed data than discard unneeded data. If the application requires that +data be considered for discarding then \fIoffset\fP and \fIlen\fP must be +page-aligned. + Pages that have not yet been written out will be unaffected, so if the application wishes to guarantee that pages will be released, it should call -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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