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MIPS: Add LATENCYTOP support

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Add LATENCYTOP support for MIPS. Tested on OCTEON.

Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Cc: linux-mips@linux-mips.org
Patchwork: https://patchwork.linux-mips.org/patch/11353/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Aaro Koskinen 2015-10-23 15:39:02 +03:00 committed by Ralf Baechle
parent 972cfd5502
commit e1e1611598
2 changed files with 19 additions and 12 deletions
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4
arch/mips/Kconfig
View file

@ -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

27
arch/mips/kernel/stacktrace.c
View file

@ -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 (trace->skip > 0)
trace->skip--;
else
trace->entries[trace->nr_entries++] = pc;
if (trace->nr_entries >= trace->max_entries)
break;
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);