From 82e9ff53f96dfb0a6ceea9a202784399a48095ab Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Wed, 11 Feb 2015 15:27:01 -0800 Subject: [PATCH] mm/compaction: enhance tracepoint output for compaction begin/end We now have tracepoint for begin event of compaction and it prints start position of both scanners, but, tracepoint for end event of compaction doesn't print finish position of both scanners. It'd be also useful to know finish position of both scanners so this patch add it. It will help to find odd behavior or problem on compaction internal logic. And mode is added to both begin/end tracepoint output, since according to mode, compaction behavior is quite different. And lastly, status format is changed to string rather than status number for readability. [akpm@linux-foundation.org: fix sparse warning] Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Mel Gorman Cc: David Rientjes Cc: Dan Carpenter Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/compaction.h | 1 + include/trace/events/compaction.h | 49 ++++++++++++++++++++++--------- mm/compaction.c | 15 ++++++++-- 3 files changed, 49 insertions(+), 16 deletions(-) diff --git a/include/linux/compaction.h b/include/linux/compaction.h index f2efda2e6ac6d..db64cae065305 100644 --- a/include/linux/compaction.h +++ b/include/linux/compaction.h @@ -12,6 +12,7 @@ #define COMPACT_PARTIAL 3 /* The full zone was compacted */ #define COMPACT_COMPLETE 4 +/* When adding new state, please change compaction_status_string, too */ /* Used to signal whether compaction detected need_sched() or lock contention */ /* No contention detected */ diff --git a/include/trace/events/compaction.h b/include/trace/events/compaction.h index 1337d9e01e3d3..839f6fac921a4 100644 --- a/include/trace/events/compaction.h +++ b/include/trace/events/compaction.h @@ -85,46 +85,67 @@ TRACE_EVENT(mm_compaction_migratepages, ); TRACE_EVENT(mm_compaction_begin, - TP_PROTO(unsigned long zone_start, unsigned long migrate_start, - unsigned long free_start, unsigned long zone_end), + TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn, + unsigned long free_pfn, unsigned long zone_end, bool sync), - TP_ARGS(zone_start, migrate_start, free_start, zone_end), + TP_ARGS(zone_start, migrate_pfn, free_pfn, zone_end, sync), TP_STRUCT__entry( __field(unsigned long, zone_start) - __field(unsigned long, migrate_start) - __field(unsigned long, free_start) + __field(unsigned long, migrate_pfn) + __field(unsigned long, free_pfn) __field(unsigned long, zone_end) + __field(bool, sync) ), TP_fast_assign( __entry->zone_start = zone_start; - __entry->migrate_start = migrate_start; - __entry->free_start = free_start; + __entry->migrate_pfn = migrate_pfn; + __entry->free_pfn = free_pfn; __entry->zone_end = zone_end; + __entry->sync = sync; ), - TP_printk("zone_start=0x%lx migrate_start=0x%lx free_start=0x%lx zone_end=0x%lx", + TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s", __entry->zone_start, - __entry->migrate_start, - __entry->free_start, - __entry->zone_end) + __entry->migrate_pfn, + __entry->free_pfn, + __entry->zone_end, + __entry->sync ? "sync" : "async") ); TRACE_EVENT(mm_compaction_end, - TP_PROTO(int status), + TP_PROTO(unsigned long zone_start, unsigned long migrate_pfn, + unsigned long free_pfn, unsigned long zone_end, bool sync, + int status), - TP_ARGS(status), + TP_ARGS(zone_start, migrate_pfn, free_pfn, zone_end, sync, status), TP_STRUCT__entry( + __field(unsigned long, zone_start) + __field(unsigned long, migrate_pfn) + __field(unsigned long, free_pfn) + __field(unsigned long, zone_end) + __field(bool, sync) __field(int, status) ), TP_fast_assign( + __entry->zone_start = zone_start; + __entry->migrate_pfn = migrate_pfn; + __entry->free_pfn = free_pfn; + __entry->zone_end = zone_end; + __entry->sync = sync; __entry->status = status; ), - TP_printk("status=%d", __entry->status) + TP_printk("zone_start=0x%lx migrate_pfn=0x%lx free_pfn=0x%lx zone_end=0x%lx, mode=%s status=%s", + __entry->zone_start, + __entry->migrate_pfn, + __entry->free_pfn, + __entry->zone_end, + __entry->sync ? "sync" : "async", + compaction_status_string[__entry->status]) ); #endif /* _TRACE_COMPACTION_H */ diff --git a/mm/compaction.c b/mm/compaction.c index 9c7e6909dd290..66f7c365e8889 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -34,6 +34,15 @@ static inline void count_compact_events(enum vm_event_item item, long delta) #endif #if defined CONFIG_COMPACTION || defined CONFIG_CMA +#ifdef CONFIG_TRACEPOINTS +static const char *const compaction_status_string[] = { + "deferred", + "skipped", + "continue", + "partial", + "complete", +}; +#endif #define CREATE_TRACE_POINTS #include @@ -1197,7 +1206,8 @@ static int compact_zone(struct zone *zone, struct compact_control *cc) zone->compact_cached_migrate_pfn[1] = cc->migrate_pfn; } - trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, cc->free_pfn, end_pfn); + trace_mm_compaction_begin(start_pfn, cc->migrate_pfn, + cc->free_pfn, end_pfn, sync); migrate_prep_local(); @@ -1299,7 +1309,8 @@ out: zone->compact_cached_free_pfn = free_pfn; } - trace_mm_compaction_end(ret); + trace_mm_compaction_end(start_pfn, cc->migrate_pfn, + cc->free_pfn, end_pfn, sync, ret); return ret; } -- 2.39.5