Commit a3afe70b authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

[S390] latencytop s390 support. 



Cc: Holger Wolf <wolf@linux.vnet.ibm.com>
Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 67fe9251

arch/s390/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -16,6 +16,9 @@ config LOCKDEP_SUPPORT 
config STACKTRACE_SUPPORT

	def_bool y



config HAVE_LATENCYTOP_SUPPORT

	def_bool y



config RWSEM_GENERIC_SPINLOCK

	bool

arch/s390/kernel/stacktrace.c

+23 −8
Original line number Diff line number Diff line
@@ -14,7 +14,8 @@ 
static unsigned long save_context_stack(struct stack_trace *trace,

					unsigned long sp,

					unsigned long low,

					unsigned long high)

					unsigned long high,

					int savesched)

{

	struct stack_frame *sf;

	struct pt_regs *regs;
@@ -47,10 +48,12 @@ static unsigned long save_context_stack(struct stack_trace *trace, 
			return sp;

		regs = (struct pt_regs *)sp;

		addr = regs->psw.addr & PSW_ADDR_INSN;

		if (savesched || !in_sched_functions(addr)) {

			if (!trace->skip)

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

			else

				trace->skip--;

		}

		if (trace->nr_entries >= trace->max_entries)

			return sp;

		low = sp;
@@ -66,15 +69,27 @@ void save_stack_trace(struct stack_trace *trace) 
	orig_sp = sp & PSW_ADDR_INSN;

	new_sp = save_context_stack(trace, orig_sp,

				    S390_lowcore.panic_stack - PAGE_SIZE,

				    S390_lowcore.panic_stack);

				    S390_lowcore.panic_stack, 1);

	if (new_sp != orig_sp)

		return;

	new_sp = save_context_stack(trace, new_sp,

				    S390_lowcore.async_stack - ASYNC_SIZE,

				    S390_lowcore.async_stack);

				    S390_lowcore.async_stack, 1);

	if (new_sp != orig_sp)

		return;

	save_context_stack(trace, new_sp,

			   S390_lowcore.thread_info,

			   S390_lowcore.thread_info + THREAD_SIZE);

			   S390_lowcore.thread_info + THREAD_SIZE, 1);

}



void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)

{

	unsigned long sp, low, high;



	sp = tsk->thread.ksp & PSW_ADDR_INSN;

	low = (unsigned long) task_stack_page(tsk);

	high = (unsigned long) task_pt_regs(tsk);

	save_context_stack(trace, sp, low, high, 0);

	if (trace->nr_entries < trace->max_entries)

		trace->entries[trace->nr_entries++] = ULONG_MAX;

}