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Date: Fri, 23 Jun 2017 15:12:55 +0800 From: "Huang, Ying" <ying.huang@...el.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, Ross Zwisler <ross.zwisler@...ux.intel.com>, linux-nvdimm@...ts.01.org, Huang Ying <ying.huang@...el.com>, Johannes Weiner <hannes@...xchg.org>, Minchan Kim <minchan@...nel.org>, Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>, Rik van Riel <riel@...hat.com> Subject: [PATCH -mm -v2 04/12] mm, THP, swap: Don't allocate huge cluster for file backed swap device From: Huang Ying <ying.huang@...el.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@...el.com> Cc: Johannes Weiner <hannes@...xchg.org> Cc: Minchan Kim <minchan@...nel.org> Cc: Hugh Dickins <hughd@...gle.com> Cc: Shaohua Li <shli@...nel.org> Cc: Rik van Riel <riel@...hat.com> --- mm/swapfile.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/mm/swapfile.c b/mm/swapfile.c index c5d2ab1416a2..d3329b209d12 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -948,9 +948,10 @@ 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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