mm: shrinker: add nid to tracepoint output

Now that we are doing NUMA-aware shrinking, and can have shrinkers
running in parallel, or working on individual nodes, it seems like we
should also be sticking the node in the output.

Signed-off-by: Dave Hansen <[email protected]>
Acked-by: Dave Chinner <[email protected]>
Cc: Konstantin Khlebnikov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

include/trace/events/vmscan.h

@@ -191,6 +191,7 @@ TRACE_EVENT(mm_shrink_slab_start,
 	TP_STRUCT__entry(
 		__field(struct shrinker *, shr)
 		__field(void *, shrink)
+		__field(int, nid)
 		__field(long, nr_objects_to_shrink)
 		__field(gfp_t, gfp_flags)
 		__field(unsigned long, pgs_scanned)
@@ -203,6 +204,7 @@ TRACE_EVENT(mm_shrink_slab_start,
 	TP_fast_assign(
 		__entry->shr = shr;
 		__entry->shrink = shr->scan_objects;
+		__entry->nid = sc->nid;
 		__entry->nr_objects_to_shrink = nr_objects_to_shrink;
 		__entry->gfp_flags = sc->gfp_mask;
 		__entry->pgs_scanned = pgs_scanned;
@@ -212,9 +214,10 @@ TRACE_EVENT(mm_shrink_slab_start,
 		__entry->total_scan = total_scan;
 	),
 
-	TP_printk("%pF %p: objects to shrink %ld gfp_flags %s pgs_scanned %ld lru_pgs %ld cache items %ld delta %lld total_scan %ld",
+	TP_printk("%pF %p: nid: %d objects to shrink %ld gfp_flags %s pgs_scanned %ld lru_pgs %ld cache items %ld delta %lld total_scan %ld",
 		__entry->shrink,
 		__entry->shr,
+		__entry->nid,
 		__entry->nr_objects_to_shrink,
 		show_gfp_flags(__entry->gfp_flags),
 		__entry->pgs_scanned,
@@ -225,13 +228,15 @@ TRACE_EVENT(mm_shrink_slab_start,
 );
 
 TRACE_EVENT(mm_shrink_slab_end,
-	TP_PROTO(struct shrinker *shr, int shrinker_retval,
+	TP_PROTO(struct shrinker *shr, int nid, int shrinker_retval,
 		long unused_scan_cnt, long new_scan_cnt, long total_scan),
 
-	TP_ARGS(shr, shrinker_retval, unused_scan_cnt, new_scan_cnt, total_scan),
+	TP_ARGS(shr, nid, shrinker_retval, unused_scan_cnt, new_scan_cnt,
+		total_scan),
 
 	TP_STRUCT__entry(
 		__field(struct shrinker *, shr)
+		__field(int, nid)
 		__field(void *, shrink)
 		__field(long, unused_scan)
 		__field(long, new_scan)
@@ -241,16 +246,18 @@ TRACE_EVENT(mm_shrink_slab_end,
 
 	TP_fast_assign(
 		__entry->shr = shr;
+		__entry->nid = nid;
 		__entry->shrink = shr->scan_objects;
 		__entry->unused_scan = unused_scan_cnt;
 		__entry->new_scan = new_scan_cnt;
 		__entry->retval = shrinker_retval;
 		__entry->total_scan = total_scan;
 	),
 
-	TP_printk("%pF %p: unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
+	TP_printk("%pF %p: nid: %d unused scan count %ld new scan count %ld total_scan %ld last shrinker return val %d",
 		__entry->shrink,
 		__entry->shr,
+		__entry->nid,
 		__entry->unused_scan,
 		__entry->new_scan,
 		__entry->total_scan,

mm/vmscan.c

@@ -324,7 +324,7 @@ shrink_slab_node(struct shrink_control *shrinkctl, struct shrinker *shrinker,
 	else
 		new_nr = atomic_long_read(&shrinker->nr_deferred[nid]);
 
-	trace_mm_shrink_slab_end(shrinker, freed, nr, new_nr, total_scan);
+	trace_mm_shrink_slab_end(shrinker, nid, freed, nr, new_nr, total_scan);
 	return freed;
 }