The patch titled
Subject: mm/memcg: only perform the debug checks on !PREEMPT_RT
has been added to the -mm tree. Its filename is
mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix-2.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix-2.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix-2.patch
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------------------------------------------------------
From: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Subject: mm/memcg: only perform the debug checks on !PREEMPT_RT
On PREEMPT_RT interrupts and preemption is always enabled. The locking
function __memcg_stats_lock() always disabled preemptions. The recently
added checks need to performed only on !PREEMPT_RT where preemption and
disabled interrupts are used.
Please fold into:
"Protect per-CPU counter by disabling preemption on PREEMPT_RT"
Link: https://lkml.kernel.org/r/Yhlf29/HqyNMOvGb@xxxxxxxxxxxxx
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@xxxxxxxxxxxxx>
Cc: Shakeel Butt <shakeelb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memcontrol.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/memcontrol.c~mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix-2
+++ a/mm/memcontrol.c
@@ -741,7 +741,7 @@ void __mod_memcg_lruvec_state(struct lru
* interrupt context while other caller need to have disabled interrupt.
*/
__memcg_stats_lock();
- if (IS_ENABLED(CONFIG_DEBUG_VM)) {
+ if (IS_ENABLED(CONFIG_DEBUG_VM) && !IS_ENABLED(CONFIG_PREEMPT_RT)) {
switch (idx) {
case NR_ANON_MAPPED:
case NR_FILE_MAPPED:
_
Patches currently in -mm which might be from bigeasy@xxxxxxxxxxxxx are
mm-memcg-disable-threshold-event-handlers-on-preempt_rt.patch
mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed.patch
mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix.patch
mm-memcg-protect-per-cpu-counter-by-disabling-preemption-on-preempt_rt-where-needed-fix-2.patch
mm-memcg-protect-memcg_stock-with-a-local_lock_t.patch
mm-memcg-disable-migration-instead-of-preemption-in-drain_all_stock.patch
