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Patch in this message | | | From | "Huang, Ying" <> | Subject | [PATCH -mm 04/13] mm, THP, swap: Don't allocate huge cluster for file backed swap device | Date | Thu, 25 May 2017 14:46:26 +0800 |
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From: Huang Ying <ying.huang@intel.com>
It's hard to write a whole transparent huge page (THP) to a file backed swap device during swapping out and the file backed swap device isn't very popular. So the huge cluster allocation for the file backed swap device is disabled.
Signed-off-by: "Huang, Ying" <ying.huang@intel.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Hugh Dickins <hughd@google.com> Cc: Shaohua Li <shli@kernel.org> Cc: Rik van Riel <riel@redhat.com> --- mm/swapfile.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c index bd0f38f31d3d..2a2f5d08f0a9 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -947,9 +947,10 @@ int get_swap_pages(int n_goal, bool cluster, swp_entry_t swp_entries[]) spin_unlock(&si->lock); goto nextsi; } - if (cluster) - n_ret = swap_alloc_cluster(si, swp_entries); - else + if (cluster) { + if (!(si->flags & SWP_FILE)) + n_ret = swap_alloc_cluster(si, swp_entries); + } else n_ret = scan_swap_map_slots(si, SWAP_HAS_CACHE, n_goal, swp_entries); spin_unlock(&si->lock); -- 2.11.0
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