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mm/compaction: enhance tracepoint output for compaction begin/end

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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 <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim 2015-02-11 15:27:01 -08:00 committed by Linus Torvalds
parent 4645f06334
commit 16c4a097a0
3 changed files with 49 additions and 16 deletions
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1
include/linux/compaction.h
View File

@ -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 */

49
include/trace/events/compaction.h
View File

@ -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 */

15
mm/compaction.c
View File

@ -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 <trace/events/compaction.h>
@ -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;
}