This is a note to let you know that I've just added the patch titled
mm: delete unnecessary and unsafe init_tlb_ubc()
to the 4.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mm-delete-unnecessary-and-unsafe-init_tlb_ubc.patch
and it can be found in the queue-4.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b385d21f27d86426472f6ae92a231095f7de2a8d Mon Sep 17 00:00:00 2001
From: Hugh Dickins <hughd@xxxxxxxxxx>
Date: Fri, 23 Sep 2016 20:27:04 -0700
Subject: mm: delete unnecessary and unsafe init_tlb_ubc()
From: Hugh Dickins <hughd@xxxxxxxxxx>
commit b385d21f27d86426472f6ae92a231095f7de2a8d upstream.
init_tlb_ubc() looked unnecessary to me: tlb_ubc is statically
initialized with zeroes in the init_task, and copied from parent to
child while it is quiescent in arch_dup_task_struct(); so I went to
delete it.
But inserted temporary debug WARN_ONs in place of init_tlb_ubc() to
check that it was always empty at that point, and found them firing:
because memcg reclaim can recurse into global reclaim (when allocating
biosets for swapout in my case), and arrive back at the init_tlb_ubc()
in shrink_node_memcg().
Resetting tlb_ubc.flush_required at that point is wrong: if the upper
level needs a deferred TLB flush, but the lower level turns out not to,
we miss a TLB flush. But fortunately, that's the only part of the
protocol that does not nest: with the initialization removed, cpumask
collects bits from upper and lower levels, and flushes TLB when needed.
Fixes: 72b252aed506 ("mm: send one IPI per CPU to TLB flush all entries after unmapping pages")
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Acked-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
mm/vmscan.c | 19 -------------------
1 file changed, 19 deletions(-)
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -2150,23 +2150,6 @@ out:
}
}
-#ifdef CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH
-static void init_tlb_ubc(void)
-{
- /*
- * This deliberately does not clear the cpumask as it's expensive
- * and unnecessary. If there happens to be data in there then the
- * first SWAP_CLUSTER_MAX pages will send an unnecessary IPI and
- * then will be cleared.
- */
- current->tlb_ubc.flush_required = false;
-}
-#else
-static inline void init_tlb_ubc(void)
-{
-}
-#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
-
/*
* This is a basic per-zone page freer. Used by both kswapd and direct reclaim.
*/
@@ -2202,8 +2185,6 @@ static void shrink_zone_memcg(struct zon
scan_adjusted = (global_reclaim(sc) && !current_is_kswapd() &&
sc->priority == DEF_PRIORITY);
- init_tlb_ubc();
-
blk_start_plug(&plug);
while (nr[LRU_INACTIVE_ANON] || nr[LRU_ACTIVE_FILE] ||
nr[LRU_INACTIVE_FILE]) {
Patches currently in stable-queue which might be from hughd@xxxxxxxxxx are
queue-4.7/mm-fix-the-page_swap_info-bug_on-check.patch
queue-4.7/ipc-shm-fix-crash-if-config_shmem-is-not-set.patch
queue-4.7/mm-delete-unnecessary-and-unsafe-init_tlb_ubc.patch
--
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