Commit f92310c1 authored by Srivatsa S. Bhat's avatar Srivatsa S. Bhat Committed by Linus Torvalds
Browse files

mm/page_alloc.c: fix the value of fallback_migratetype in alloc_extfrag tracepoint()

In the current code, the value of fallback_migratetype that is printed
using the mm_page_alloc_extfrag tracepoint, is the value of the
migratetype *after* it has been set to the preferred migratetype (if the
ownership was changed).  Obviously that wouldn't have been the original
intent.  (We already have a separate 'change_ownership' field to tell
whether the ownership of the pageblock was changed from the
fallback_migratetype to the preferred type.)

The intent of the fallback_migratetype field is to show the migratetype
from which we borrowed pages in order to satisfy the allocation request.
So fix the code to print that value correctly.
Signed-off-by: default avatarSrivatsa S. Bhat <>
Cc: Mel Gorman <>
Cc: Minchan Kim <>
Cc: Cody P Schafer <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent fef903ef
......@@ -268,11 +268,13 @@ TRACE_EVENT(mm_page_alloc_extfrag,
TP_PROTO(struct page *page,
int alloc_order, int fallback_order,
int alloc_migratetype, int fallback_migratetype),
int alloc_migratetype, int fallback_migratetype,
int change_ownership),
alloc_order, fallback_order,
alloc_migratetype, fallback_migratetype),
alloc_migratetype, fallback_migratetype,
__field( struct page *, page )
......@@ -280,6 +282,7 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__field( int, fallback_order )
__field( int, alloc_migratetype )
__field( int, fallback_migratetype )
__field( int, change_ownership )
......@@ -288,6 +291,7 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->fallback_order = fallback_order;
__entry->alloc_migratetype = alloc_migratetype;
__entry->fallback_migratetype = fallback_migratetype;
__entry->change_ownership = change_ownership;
TP_printk("page=%p pfn=%lu alloc_order=%d fallback_order=%d pageblock_order=%d alloc_migratetype=%d fallback_migratetype=%d fragmenting=%d change_ownership=%d",
......@@ -299,7 +303,7 @@ TRACE_EVENT(mm_page_alloc_extfrag,
__entry->fallback_order < pageblock_order,
__entry->alloc_migratetype == __entry->fallback_migratetype)
#endif /* _TRACE_KMEM_H */
......@@ -1101,8 +1101,9 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
? migratetype : start_migratetype);
trace_mm_page_alloc_extfrag(page, order, current_order,
start_migratetype, new_type);
trace_mm_page_alloc_extfrag(page, order,
current_order, start_migratetype, migratetype,
new_type == start_migratetype);
return page;
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