From 0d3d062a6e289e065bd0aa537a6806a1806bf8aa Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Mon, 21 Sep 2009 17:02:44 -0700 Subject: tracing, page-allocator: add trace event for page traffic related to the buddy lists The page allocation trace event reports that a page was successfully allocated but it does not specify where it came from. When analysing performance, it can be important to distinguish between pages coming from the per-cpu allocator and pages coming from the buddy lists as the latter requires the zone lock to the taken and more data structures to be examined. This patch adds a trace event for __rmqueue reporting when a page is being allocated from the buddy lists. It distinguishes between being called to refill the per-cpu lists or whether it is a high-order allocation. Similarly, this patch adds an event to catch when the PCP lists are being drained a little and pages are going back to the buddy lists. This is trickier to draw conclusions from but high activity on those events could explain why there were a large number of cache misses on a page-allocator-intensive workload. The coalescing and splitting of buddies involves a lot of writing of page metadata and cache line bounces not to mention the acquisition of an interrupt-safe lock necessary to enter this path. [akpm@linux-foundation.org: fix build] Signed-off-by: Mel Gorman Acked-by: Rik van Riel Reviewed-by: Ingo Molnar Cc: Larry Woodman Cc: Peter Zijlstra Cc: Li Ming Chun Reviewed-by: KOSAKI Motohiro Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/trace/events/kmem.h | 51 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 51 insertions(+) (limited to 'include/trace/events') diff --git a/include/trace/events/kmem.h b/include/trace/events/kmem.h index aae16ee1760..eaf46bdd18a 100644 --- a/include/trace/events/kmem.h +++ b/include/trace/events/kmem.h @@ -299,6 +299,57 @@ TRACE_EVENT(mm_page_alloc, show_gfp_flags(__entry->gfp_flags)) ); +TRACE_EVENT(mm_page_alloc_zone_locked, + + TP_PROTO(struct page *page, unsigned int order, int migratetype), + + TP_ARGS(page, order, migratetype), + + TP_STRUCT__entry( + __field( struct page *, page ) + __field( unsigned int, order ) + __field( int, migratetype ) + ), + + TP_fast_assign( + __entry->page = page; + __entry->order = order; + __entry->migratetype = migratetype; + ), + + TP_printk("page=%p pfn=%lu order=%u migratetype=%d percpu_refill=%d", + __entry->page, + page_to_pfn(__entry->page), + __entry->order, + __entry->migratetype, + __entry->order == 0) +); + +TRACE_EVENT(mm_page_pcpu_drain, + + TP_PROTO(struct page *page, int order, int migratetype), + + TP_ARGS(page, order, migratetype), + + TP_STRUCT__entry( + __field( struct page *, page ) + __field( int, order ) + __field( int, migratetype ) + ), + + TP_fast_assign( + __entry->page = page; + __entry->order = order; + __entry->migratetype = migratetype; + ), + + TP_printk("page=%p pfn=%lu order=%d migratetype=%d", + __entry->page, + page_to_pfn(__entry->page), + __entry->order, + __entry->migratetype) +); + TRACE_EVENT(mm_page_alloc_extfrag, TP_PROTO(struct page *page, -- cgit v1.2.3