From: Mel Gorman <mgorman@suse.de>
To: Andrew Morton <akpm@linux-foundation.org>,
Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>, Mel Gorman <mgorman@suse.de>
Subject: [PATCH 0/2] Improve documentation of FADV_DONTNEED behaviour
Date: Wed, 3 Dec 2014 00:42:45 +0000 [thread overview]
Message-ID: <1417567367-9298-1-git-send-email-mgorman@suse.de> (raw)
Partial page discard requests are ignored and the documentation on why this
is correct behaviour sucks. A readahead patch looked like a "regression" to
a random IO storage benchmark because posix_fadvise() was used incorrectly
to force IO requests to go to disk. In reality, the benchmark sucked but
it was non-obvious why. Patch 1 updates the kernel comment in case someone
"fixes" either readahead or fadvise for inappropriate reasons. Patch 2
updates the relevant man page on the rough off chance that application
developers do not read kernel source comments.
--
2.1.2
next reply other threads:[~2014-12-03 0:42 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-12-03 0:42 Mel Gorman [this message]
2014-12-03 0:42 ` [PATCH 1/2] mm: fadvise: Document the fadvise(FADV_DONTNEED) behaviour for partial pages Mel Gorman
2014-12-03 0:42 ` [PATCH 2/2] posix_fadvise.2: Document the behaviour of partial page discard requests Mel Gorman
2014-12-30 20:48 ` Michael Kerrisk (man-pages)
2014-12-30 20:51 ` [PATCH 0/2] Improve documentation of FADV_DONTNEED behaviour Michael Kerrisk (man-pages)
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