The quilt patch titled
Subject: mm: introduce per-VMA lock statistics
has been removed from the -mm tree. Its filename was
mm-introduce-per-vma-lock-statistics.patch
This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
------------------------------------------------------
From: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Subject: mm: introduce per-VMA lock statistics
Date: Mon, 27 Feb 2023 09:36:27 -0800
Add a new CONFIG_PER_VMA_LOCK_STATS config option to dump extra statistics
about handling page fault under VMA lock.
Link: https://lkml.kernel.org/r/20230227173632.3292573-29-surenb@xxxxxxxxxx
Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vm_event_item.h | 6 ++++++
include/linux/vmstat.h | 6 ++++++
mm/Kconfig.debug | 6 ++++++
mm/memory.c | 2 ++
mm/vmstat.c | 6 ++++++
5 files changed, 26 insertions(+)
--- a/include/linux/vm_event_item.h~mm-introduce-per-vma-lock-statistics
+++ a/include/linux/vm_event_item.h
@@ -150,6 +150,12 @@ enum vm_event_item { PGPGIN, PGPGOUT, PS
DIRECT_MAP_LEVEL2_SPLIT,
DIRECT_MAP_LEVEL3_SPLIT,
#endif
+#ifdef CONFIG_PER_VMA_LOCK_STATS
+ VMA_LOCK_SUCCESS,
+ VMA_LOCK_ABORT,
+ VMA_LOCK_RETRY,
+ VMA_LOCK_MISS,
+#endif
NR_VM_EVENT_ITEMS
};
--- a/include/linux/vmstat.h~mm-introduce-per-vma-lock-statistics
+++ a/include/linux/vmstat.h
@@ -125,6 +125,12 @@ static inline void vm_events_fold_cpu(in
#define count_vm_tlb_events(x, y) do { (void)(y); } while (0)
#endif
+#ifdef CONFIG_PER_VMA_LOCK_STATS
+#define count_vm_vma_lock_event(x) count_vm_event(x)
+#else
+#define count_vm_vma_lock_event(x) do {} while (0)
+#endif
+
#define __count_zid_vm_events(item, zid, delta) \
__count_vm_events(item##_NORMAL - ZONE_NORMAL + zid, delta)
--- a/mm/Kconfig.debug~mm-introduce-per-vma-lock-statistics
+++ a/mm/Kconfig.debug
@@ -279,3 +279,9 @@ config DEBUG_KMEMLEAK_AUTO_SCAN
If unsure, say Y.
+config PER_VMA_LOCK_STATS
+ bool "Statistics for per-vma locks"
+ depends on PER_VMA_LOCK
+ default y
+ help
+ Statistics for per-vma locks.
--- a/mm/memory.c~mm-introduce-per-vma-lock-statistics
+++ a/mm/memory.c
@@ -5284,6 +5284,7 @@ retry:
/* Check if the VMA got isolated after we found it */
if (vma->detached) {
vma_end_read(vma);
+ count_vm_vma_lock_event(VMA_LOCK_MISS);
/* The area was replaced with another one */
goto retry;
}
@@ -5292,6 +5293,7 @@ retry:
return vma;
inval:
rcu_read_unlock();
+ count_vm_vma_lock_event(VMA_LOCK_ABORT);
return NULL;
}
#endif /* CONFIG_PER_VMA_LOCK */
--- a/mm/vmstat.c~mm-introduce-per-vma-lock-statistics
+++ a/mm/vmstat.c
@@ -1399,6 +1399,12 @@ const char * const vmstat_text[] = {
"direct_map_level2_splits",
"direct_map_level3_splits",
#endif
+#ifdef CONFIG_PER_VMA_LOCK_STATS
+ "vma_lock_success",
+ "vma_lock_abort",
+ "vma_lock_retry",
+ "vma_lock_miss",
+#endif
#endif /* CONFIG_VM_EVENT_COUNTERS || CONFIG_MEMCG */
};
#endif /* CONFIG_PROC_FS || CONFIG_SYSFS || CONFIG_NUMA || CONFIG_MEMCG */
_
Patches currently in -mm which might be from surenb@xxxxxxxxxx are
