diff options
| author | Mel Gorman <mgorman@suse.de> | 2014-01-21 15:51:01 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-01-21 16:19:48 -0800 |
| commit | af1839d722c986ffeaae1e70a6ef1c75ff38dcd5 (patch) | |
| tree | 9de959141096c28bbb9ff65ffe8e087f88df231d | |
| parent | 1c5e9c27cbd966c7f0038698d5dcd5ada3574f47 (diff) | |
mm: numa: trace tasks that fail migration due to rate limiting
A low local/remote numa hinting fault ratio is potentially explained by
failed migrations. This patch adds a tracepoint that fires when
migration fails due to migration rate limitation.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Alex Thorlton <athorlton@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/trace/events/migrate.h | 26 | ||||
| -rw-r--r-- | mm/migrate.c | 5 |
2 files changed, 30 insertions, 1 deletions
diff --git a/include/trace/events/migrate.h b/include/trace/events/migrate.h index ec2a6ccfd7e5..3075ffbb9a83 100644 --- a/include/trace/events/migrate.h +++ b/include/trace/events/migrate.h @@ -45,6 +45,32 @@ TRACE_EVENT(mm_migrate_pages, __print_symbolic(__entry->reason, MIGRATE_REASON)) ); +TRACE_EVENT(mm_numa_migrate_ratelimit, + + TP_PROTO(struct task_struct *p, int dst_nid, unsigned long nr_pages), + + TP_ARGS(p, dst_nid, nr_pages), + + TP_STRUCT__entry( + __array( char, comm, TASK_COMM_LEN) + __field( pid_t, pid) + __field( int, dst_nid) + __field( unsigned long, nr_pages) + ), + + TP_fast_assign( + memcpy(__entry->comm, p->comm, TASK_COMM_LEN); + __entry->pid = p->pid; + __entry->dst_nid = dst_nid; + __entry->nr_pages = nr_pages; + ), + + TP_printk("comm=%s pid=%d dst_nid=%d nr_pages=%lu", + __entry->comm, + __entry->pid, + __entry->dst_nid, + __entry->nr_pages) +); #endif /* _TRACE_MIGRATE_H */ /* This part must be outside protection */ diff --git a/mm/migrate.c b/mm/migrate.c index 4612bb2e3677..f9e16350d09c 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -1614,8 +1614,11 @@ static bool numamigrate_update_ratelimit(pg_data_t *pgdat, msecs_to_jiffies(migrate_interval_millisecs); spin_unlock(&pgdat->numabalancing_migrate_lock); } - if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) + if (pgdat->numabalancing_migrate_nr_pages > ratelimit_pages) { + trace_mm_numa_migrate_ratelimit(current, pgdat->node_id, + nr_pages); return true; + } /* * This is an unlocked non-atomic update so errors are possible. |