tracing, memcg, vmscan: Hide trace events when not in use (f40a37cb) · Commits · 戴 / test

When trace events are defined but not used they still create data structures and functions for their use, even though nothing may be using them. The trace events mm_vmscan_memcg_reclaim_begin, mm_vmscan_memcg_softlimit_reclaim_begin, mm_vmscan_memcg_reclaim_end, and mm_vmscan_memcg_softlimit_reclaim_end are not used if CONFIG_MEMCG is not defined. Do not create these trace events unless CONFIG_MEMCG is defined. Link: http://lkml.kernel.org/r/20171012184632.2bd247cd@gandalf.local.home Acked-by:

Michal Hocko <mhocko@suse.com> Signed-off-by:

Steven Rostedt (VMware) <rostedt@goodmis.org>

include/trace/events/vmscan.h

+4 −0

Original line number	Diff line number	Diff line
		@@ -133,6 +133,7 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_direct_reclaim_b
		TP_ARGS(order, may_writepage, gfp_flags, classzone_idx)
		);

		#ifdef CONFIG_MEMCG
		DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_reclaim_begin,

		TP_PROTO(int order, int may_writepage, gfp_t gfp_flags, int classzone_idx),
		@@ -146,6 +147,7 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_begin_template, mm_vmscan_memcg_softlimit_

		TP_ARGS(order, may_writepage, gfp_flags, classzone_idx)
		);
		#endif /* CONFIG_MEMCG */

		DECLARE_EVENT_CLASS(mm_vmscan_direct_reclaim_end_template,

		@@ -171,6 +173,7 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_direct_reclaim_end
		TP_ARGS(nr_reclaimed)
		);

		#ifdef CONFIG_MEMCG
		DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_reclaim_end,

		TP_PROTO(unsigned long nr_reclaimed),
		@@ -184,6 +187,7 @@ DEFINE_EVENT(mm_vmscan_direct_reclaim_end_template, mm_vmscan_memcg_softlimit_re

		TP_ARGS(nr_reclaimed)
		);
		#endif /* CONFIG_MEMCG */

		TRACE_EVENT(mm_shrink_slab_start,
		TP_PROTO(struct shrinker shr, struct shrink_control sc,

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