diff options
| -rw-r--r-- | kernel/trace/trace_sysprof.c | 89 |
1 files changed, 80 insertions, 9 deletions
diff --git a/kernel/trace/trace_sysprof.c b/kernel/trace/trace_sysprof.c index 76dd953..ebcb66d 100644 --- a/kernel/trace/trace_sysprof.c +++ b/kernel/trace/trace_sysprof.c @@ -14,6 +14,8 @@ #include <linux/irq.h> #include <linux/fs.h> +#include <asm/stacktrace.h> + #include "trace.h" static struct trace_array *sysprof_trace; @@ -52,6 +54,77 @@ static int copy_stack_frame(const void __user *fp, struct stack_frame *frame) return ret; } +struct backtrace_info { + struct trace_array_cpu *data; + struct trace_array *tr; + int pos; +}; + +static void +backtrace_warning_symbol(void *data, char *msg, unsigned long symbol) +{ + /* Ignore warnings */ +} + +static void backtrace_warning(void *data, char *msg) +{ + /* Ignore warnings */ +} + +static int backtrace_stack(void *data, char *name) +{ + /* Don't bother with IRQ stacks for now */ + return -1; +} + +static void backtrace_address(void *data, unsigned long addr, int reliable) +{ + struct backtrace_info *info = data; + + if (info->pos < sample_max_depth && reliable) { + __trace_special(info->tr, info->data, 1, addr, 0); + + info->pos++; + } +} + +const static struct stacktrace_ops backtrace_ops = { + .warning = backtrace_warning, + .warning_symbol = backtrace_warning_symbol, + .stack = backtrace_stack, + .address = backtrace_address, +}; + +static struct pt_regs * +trace_kernel(struct pt_regs *regs, struct trace_array *tr, + struct trace_array_cpu *data) +{ + struct backtrace_info info; + unsigned long bp; + char *user_stack; + char *stack; + + info.tr = tr; + info.data = data; + info.pos = 1; + + __trace_special(info.tr, info.data, 1, regs->ip, 0); + + stack = ((char *)regs + sizeof(struct pt_regs)); +#ifdef CONFIG_FRAME_POINTER + bp = regs->bp; +#else + bp = 0; +#endif + + dump_trace(NULL, regs, (void *)stack, bp, &backtrace_ops, &info); + + /* Now trace the user stack */ + user_stack = ((char *)current->thread.sp0 - sizeof(struct pt_regs)); + + return (struct pt_regs *)user_stack; +} + static void timer_notify(struct pt_regs *regs, int cpu) { struct trace_array_cpu *data; @@ -74,17 +147,15 @@ static void timer_notify(struct pt_regs *regs, int cpu) if (is_user && current->state != TASK_RUNNING) return; - if (!is_user) { - /* kernel */ - ftrace(tr, data, current->pid, 1, 0); - return; + __trace_special(tr, data, 0, 0, current->pid); - } - - __trace_special(tr, data, 0, current->pid, regs->ip); + if (!is_user) + regs = trace_kernel(regs, tr, data); fp = (void __user *)regs->bp; + __trace_special(tr, data, 2, regs->ip, 0); + for (i = 0; i < sample_max_depth; i++) { frame.next_fp = 0; frame.return_address = 0; @@ -93,12 +164,12 @@ static void timer_notify(struct pt_regs *regs, int cpu) if ((unsigned long)fp < regs->sp) break; - __trace_special(tr, data, 1, frame.return_address, + __trace_special(tr, data, 2, frame.return_address, (unsigned long)fp); fp = frame.next_fp; } - __trace_special(tr, data, 2, current->pid, i); + __trace_special(tr, data, 3, current->pid, i); /* * Special trace entry if we overflow the max depth: |
