Add 'lat' field to the mm_page_alloc tracepoint. It shows allocation
latency in microseconds (0.000001 second).
Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
---
include/trace/events/kmem.h | 10 ++++++----
mm/page_alloc.c | 3 ++-
2 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h
index 6bc943ecb841..25ab6f8b3b42 100644
--- a/include/trace/events/kmem.h
+++ b/include/trace/events/kmem.h
@@ -194,15 +194,16 @@ TRACE_EVENT(mm_page_free_batched,
TRACE_EVENT(mm_page_alloc,
TP_PROTO(struct page *page, unsigned int order,
- gfp_t gfp_flags, int migratetype),
+ gfp_t gfp_flags, int migratetype, u64 time),
- TP_ARGS(page, order, gfp_flags, migratetype),
+ TP_ARGS(page, order, gfp_flags, migratetype, time),
TP_STRUCT__entry(
__field( struct page *, page )
__field( unsigned int, order )
__field( gfp_t, gfp_flags )
__field( int, migratetype )
+ __field( u64, time )
),
TP_fast_assign(
@@ -212,12 +213,13 @@ TRACE_EVENT(mm_page_alloc,
__entry->migratetype = migratetype;
),
- TP_printk("page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s",
+ TP_printk("page=%p pfn=%lu order=%d migratetype=%d gfp_flags=%s
lat=%ld",
__entry->page,
__entry->page ? page_to_pfn(__entry->page) : 0,
__entry->order,
__entry->migratetype,
- show_gfp_flags(__entry->gfp_flags))
+ show_gfp_flags(__entry->gfp_flags),
+ __entry->time)
);
DECLARE_EVENT_CLASS(mm_page,
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 47889c7b6ac4..63d723bff3a9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3616,7 +3616,8 @@ __alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
}
__alloc_collect_stats(gfp_mask, order, page, start);
- trace_mm_page_alloc(page, order, gfp_mask, migratetype);
+ trace_mm_page_alloc(page, order, gfp_mask, migratetype,
+ jiffies_to_usecs(jiffies - start));
out:
/*
--
2.19.2
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