Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit e1e16115 authored by Aaro Koskinen's avatar Aaro Koskinen Committed by Ralf Baechle
Browse files

MIPS: Add LATENCYTOP support 



Add LATENCYTOP support for MIPS. Tested on OCTEON.

Signed-off-by: default avatarAaro Koskinen <aaro.koskinen@nokia.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11353/


Signed-off-by: default avatarRalf Baechle <ralf@linux-mips.org>
parent 972cfd55

arch/mips/Kconfig

+4 −0
Original line number Diff line number Diff line
@@ -2759,6 +2759,10 @@ config STACKTRACE_SUPPORT 
	bool

	default y



config HAVE_LATENCYTOP_SUPPORT

	bool

	default y



config PGTABLE_LEVELS

	int

	default 3 if 64BIT && !PAGE_SIZE_64KB

arch/mips/kernel/stacktrace.c

+15 −12
Original line number Diff line number Diff line
@@ -12,14 +12,15 @@ 
 * Save stack-backtrace addresses into a stack_trace buffer:

 */

static void save_raw_context_stack(struct stack_trace *trace,

	unsigned long reg29)

	unsigned long reg29, int savesched)

{

	unsigned long *sp = (unsigned long *)reg29;

	unsigned long addr;



	while (!kstack_end(sp)) {

		addr = *sp++;

		if (__kernel_text_address(addr)) {

		if (__kernel_text_address(addr) &&

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

			if (trace->skip > 0)

				trace->skip--;

			else
@@ -31,7 +32,7 @@ static void save_raw_context_stack(struct stack_trace *trace, 
}



static void save_context_stack(struct stack_trace *trace,

	struct task_struct *tsk, struct pt_regs *regs)

	struct task_struct *tsk, struct pt_regs *regs, int savesched)

{

	unsigned long sp = regs->regs[29];

#ifdef CONFIG_KALLSYMS
@@ -43,20 +44,22 @@ static void save_context_stack(struct stack_trace *trace, 
			(unsigned long)task_stack_page(tsk);

		if (stack_page && sp >= stack_page &&

		    sp <= stack_page + THREAD_SIZE - 32)

			save_raw_context_stack(trace, sp);

			save_raw_context_stack(trace, sp, savesched);

		return;

	}

	do {

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

			if (trace->skip > 0)

				trace->skip--;

			else

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

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

				break;

		}

		pc = unwind_stack(tsk, &sp, pc, &ra);

	} while (pc);

#else

	save_raw_context_stack(trace, sp);

	save_raw_context_stack(trace, sp, savesched);

#endif

}
@@ -82,6 +85,6 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace) 
		regs->cp0_epc = tsk->thread.reg31;

	} else

		prepare_frametrace(regs);

	save_context_stack(trace, tsk, regs);

	save_context_stack(trace, tsk, regs, tsk == current);

}

EXPORT_SYMBOL_GPL(save_stack_trace_tsk);