The patch titled
mm/compaction: reverse the change that forbade sync migraton with __GFP_NO_KSWAPD
has been added to the -mm tree. Its filename is
mm-compaction-reverse-the-change-that-forbade-sync-migraton-with-__gfp_no_kswapd.patch
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------------------------------------------------------
Subject: mm/compaction: reverse the change that forbade sync migraton with __GFP_NO_KSWAPD
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
It's uncertain this has been beneficial, so it's safer to undo it. All
other compaction users would still go in synchronous mode if a first
attempt at async compaction failed. Hopefully we don't need to force
special behavior for THP (which is the only __GFP_NO_KSWAPD user so far
and it's the easier to exercise and to be noticeable). This also make
__GFP_NO_KSWAPD return to its original strict semantics specific to bypass
kswapd, as THP allocations have khugepaged for the async THP
allocations/compactions.
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Alex Villacis Lasso <avillaci@xxxxxxxxxxxxxxxxx>
Cc: Mel Gorman <mel@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff -puN mm/page_alloc.c~mm-compaction-reverse-the-change-that-forbade-sync-migraton-with-__gfp_no_kswapd mm/page_alloc.c
--- a/mm/page_alloc.c~mm-compaction-reverse-the-change-that-forbade-sync-migraton-with-__gfp_no_kswapd
+++ a/mm/page_alloc.c
@@ -2106,7 +2106,7 @@ rebalance:
sync_migration);
if (page)
goto got_pg;
- sync_migration = !(gfp_mask & __GFP_NO_KSWAPD);
+ sync_migration = true;
/* Try direct reclaim and then allocating */
page = __alloc_pages_direct_reclaim(gfp_mask, order,
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
mm-add-vm-counters-for-transparent-hugepages.patch
mm-thp-use-conventional-format-for-boolean-attributes.patch
mm-compaction-reverse-the-change-that-forbade-sync-migraton-with-__gfp_no_kswapd.patch
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