[ARM] latencytop support (f76e9154) · Commits · 戴 / test

arch/arm/Kconfig

+5 −0

Original line number	Diff line number	Diff line
		@@ -84,6 +84,11 @@ config STACKTRACE_SUPPORT
		bool
		default y

		config HAVE_LATENCYTOP_SUPPORT
		bool
		depends on !SMP
		default y

		config LOCKDEP_SUPPORT
		bool
		default y

+30 −4

Original line number	Diff line number	Diff line
		@@ -36,6 +36,7 @@ EXPORT_SYMBOL(walk_stackframe);
		#ifdef CONFIG_STACKTRACE
		struct stack_trace_data {
		struct stack_trace *trace;
		unsigned int no_sched_functions;
		unsigned int skip;
		};

		@@ -43,27 +44,52 @@ static int save_trace(struct stackframe frame, void d)
		{
		struct stack_trace_data *data = d;
		struct stack_trace *trace = data->trace;
		unsigned long addr = frame->lr;

		if (data->no_sched_functions && in_sched_functions(addr))
		return 0;
		if (data->skip) {
		data->skip--;
		return 0;
		}

		trace->entries[trace->nr_entries++] = frame->lr;
		trace->entries[trace->nr_entries++] = addr;

		return trace->nr_entries >= trace->max_entries;
		}

		void save_stack_trace(struct stack_trace *trace)
		void save_stack_trace_tsk(struct task_struct tsk, struct stack_trace trace)
		{
		struct stack_trace_data data;
		unsigned long fp, base;

		data.trace = trace;
		data.skip = trace->skip;
		base = (unsigned long)task_stack_page(current);
		base = (unsigned long)task_stack_page(tsk);

		if (tsk != current) {
		#ifdef CONFIG_SMP
		/*
		* What guarantees do we have here that 'tsk'
		* is not running on another CPU?
		*/
		BUG();
		#else
		data.no_sched_functions = 1;
		fp = thread_saved_fp(tsk);
		#endif
		} else {
		data.no_sched_functions = 0;
		asm("mov %0, fp" : "=r" (fp));
		}

		walk_stackframe(fp, base, base + THREAD_SIZE, save_trace, &data);
		if (trace->nr_entries < trace->max_entries)
		trace->entries[trace->nr_entries++] = ULONG_MAX;
		}

		void save_stack_trace(struct stack_trace *trace)
		{
		save_stack_trace_tsk(current, trace);
		}
		#endif