[RFC PATCH RESEND 20/28] mm: introduce per-VMA lock statistics
From: Suren Baghdasaryan <surenb@google.com>
Date: 2022-09-01 17:38:02
Also in:
linux-arm-kernel, linux-mm, lkml
Subsystem:
memory management, memory management - core, the rest · Maintainers:
Andrew Morton, David Hildenbrand, Linus Torvalds
Add a new CONFIG_PER_VMA_LOCK_STATS config option to dump extra statistics about handling page fault under VMA lock. Signed-off-by: Suren Baghdasaryan <surenb@google.com> --- include/linux/vm_event_item.h | 6 ++++++ include/linux/vmstat.h | 6 ++++++ mm/Kconfig.debug | 8 ++++++++ mm/vmstat.c | 6 ++++++ 4 files changed, 26 insertions(+)
diff --git a/include/linux/vm_event_item.h b/include/linux/vm_event_item.h
index f3fc36cd2276..a325783ed05d 100644
--- a/include/linux/vm_event_item.h
+++ b/include/linux/vm_event_item.h@@ -150,6 +150,12 @@ enum vm_event_item { PGPGIN, PGPGOUT, PSWPIN, PSWPOUT, #ifdef CONFIG_X86 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 };
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index bfe38869498d..0c2611899cfc 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h@@ -131,6 +131,12 @@ static inline void vm_events_fold_cpu(int cpu) #define count_vm_vmacache_event(x) do {} 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)
diff --git a/mm/Kconfig.debug b/mm/Kconfig.debug
index ce8dded36de9..075642763a03 100644
--- a/mm/Kconfig.debug
+++ b/mm/Kconfig.debug@@ -207,3 +207,11 @@ config PTDUMP_DEBUGFS kernel. If in doubt, say N. + + +config PER_VMA_LOCK_STATS + bool "Statistics for per-vma locks" + depends on PER_VMA_LOCK + help + Statistics for per-vma locks. + If in doubt, say N.
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 90af9a8572f5..3f3804c846a6 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c@@ -1411,6 +1411,12 @@ 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 */
--
2.37.2.789.g6183377224-goog