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Commit 75564232 authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar
Browse files

perf_counter: use list_move_tail() 



Instead of del/add use a move list-op.

Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 595258aa

kernel/perf_counter.c

+2 −4
Original line number Diff line number Diff line
@@ -89,8 +89,7 @@ list_del_counter(struct perf_counter *counter, struct perf_counter_context *ctx) 
	list_for_each_entry_safe(sibling, tmp,

				 &counter->sibling_list, list_entry) {



		list_del_init(&sibling->list_entry);

		list_add_tail(&sibling->list_entry, &ctx->counter_list);

		list_move_tail(&sibling->list_entry, &ctx->counter_list);

		sibling->group_leader = sibling;

	}

}
@@ -959,8 +958,7 @@ static void rotate_ctx(struct perf_counter_context *ctx) 
	 */

	perf_flags = hw_perf_save_disable();

	list_for_each_entry(counter, &ctx->counter_list, list_entry) {

		list_del(&counter->list_entry);

		list_add_tail(&counter->list_entry, &ctx->counter_list);

		list_move_tail(&counter->list_entry, &ctx->counter_list);

		break;

	}

	hw_perf_restore(perf_flags);