From: Shaohua Li <shli@fb.com>
To: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>
Cc: <Kernel-team@fb.com>, <mhocko@suse.com>, <minchan@kernel.org>,
<hughd@google.com>, <hannes@cmpxchg.org>, <riel@redhat.com>,
<mgorman@techsingularity.net>
Subject: [RFC 6/6] mm: enable MADV_FREE for swapless system
Date: Sun, 29 Jan 2017 21:51:23 -0800 [thread overview]
Message-ID: <50b078171991f3ffdbdc34b6e0d7b3a146b7c859.1485748619.git.shli@fb.com> (raw)
In-Reply-To: <cover.1485748619.git.shli@fb.com>
Now MADV_FREE pages can be easily reclaimed even for swapless system. We
can safely enable MADV_FREE for all systems.
Cc: Michal Hocko <mhocko@suse.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Shaohua Li <shli@fb.com>
---
mm/madvise.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff --git a/mm/madvise.c b/mm/madvise.c
index 78b4b02..047cfd4 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -579,13 +579,7 @@ madvise_vma(struct vm_area_struct *vma, struct vm_area_struct **prev,
case MADV_WILLNEED:
return madvise_willneed(vma, prev, start, end);
case MADV_FREE:
- /*
- * XXX: In this implementation, MADV_FREE works like
- * MADV_DONTNEED on swapless system or full swap.
- */
- if (get_nr_swap_pages() > 0)
- return madvise_free(vma, prev, start, end);
- /* passthrough */
+ return madvise_free(vma, prev, start, end);
case MADV_DONTNEED:
return madvise_dontneed(vma, prev, start, end);
default:
--
2.9.3
next prev parent reply other threads:[~2017-01-30 5:52 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-30 5:51 [RFC 0/6]mm: add new LRU list for MADV_FREE pages Shaohua Li
2017-01-30 5:51 ` [RFC 1/6] mm: add wrap for page accouting index Shaohua Li
2017-01-30 5:51 ` [RFC 2/6] mm: add lazyfree page flag Shaohua Li
2017-01-30 5:51 ` [RFC 3/6] mm: add LRU_LAZYFREE lru list Shaohua Li
2017-01-30 5:51 ` [RFC 4/6] mm: move MADV_FREE pages into LRU_LAZYFREE list Shaohua Li
2017-01-30 5:51 ` [RFC 5/6] mm: reclaim lazyfree pages Shaohua Li
2017-01-30 5:51 ` Shaohua Li [this message]
2017-01-31 18:59 ` [RFC 0/6]mm: add new LRU list for MADV_FREE pages Johannes Weiner
2017-01-31 19:45 ` Shaohua Li
2017-01-31 21:38 ` Johannes Weiner
2017-02-01 9:02 ` Michal Hocko
2017-02-01 16:37 ` Shaohua Li
2017-02-02 5:14 ` Minchan Kim
2017-02-02 19:28 ` Johannes Weiner
2017-02-01 5:47 ` Minchan Kim
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