net: minor optimization in qdisc_qstats_cpu_drop()

edumazet · davem330 · commit eb60a8ddf3c3 · 2016-08-25T16:45:29.000-07:00
per_cpu_inc() is faster (at least on x86) than per_cpu_ptr(xxx)++;

Signed-off-by: Eric Dumazet &lt;edumazet@google.com&gt;
Acked-by: John Fastabend &lt;john.r.fastabend@intel.com&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;
diff --git a/include/net/sch_generic.h b/include/net/sch_generic.h
@@ -592,7 +592,7 @@ static inline void qdisc_qstats_drop(struct Qdisc *sch)
 
 static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)
 {
-	qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));
+	this_cpu_inc(sch->cpu_qstats->drops);
 }
 
 static inline void qdisc_qstats_overlimit(struct Qdisc *sch)

Original file line number	Diff line number	Diff line change
`@@ -592,7 +592,7 @@ static inline void qdisc_qstats_drop(struct Qdisc *sch)`
`592`	`592`
`593`	`593`	`static inline void qdisc_qstats_cpu_drop(struct Qdisc *sch)`
`594`	`594`	`{`
`595`		`- qstats_drop_inc(this_cpu_ptr(sch->cpu_qstats));`
	`595`	`+ this_cpu_inc(sch->cpu_qstats->drops);`
`596`	`596`	`}`
`597`	`597`
`598`	`598`	`static inline void qdisc_qstats_overlimit(struct Qdisc *sch)`