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Add timestamp for every record! #11

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Add timestamp for every record! #11

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23 changes: 20 additions & 3 deletions trace_irqoff.c
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Original file line number Diff line number Diff line change
Expand Up @@ -93,6 +93,7 @@ struct irqoff_trace {

struct stack_trace_metadata {
u64 last_timestamp;
u64 begin_timestamp[MAX_STACE_TRACE_ENTRIES];
unsigned long nr_irqoff_trace;
struct irqoff_trace trace[MAX_STACE_TRACE_ENTRIES];
unsigned long nr_entries;
Expand Down Expand Up @@ -121,6 +122,16 @@ struct per_cpu_stack_trace {
};

static struct per_cpu_stack_trace __percpu *cpu_stack_trace;
static size_t time_to_sec(u64 ts, char *buf)
{
unsigned long rem_nsec;
rem_nsec = do_div(ts, 1000000000);
if (!buf)
return snprintf(NULL, 0, "start_time:%7lu.%06lus ", (unsigned long)ts);
return sprintf(buf, "start_time:%7lu.%06lus",
(unsigned long)ts, rem_nsec / 1000);

}

#if LINUX_VERSION_CODE < KERNEL_VERSION(5, 1, 0)
static void (*save_stack_trace_skip_hardirq)(struct pt_regs *regs,
Expand Down Expand Up @@ -253,6 +264,8 @@ static bool save_trace(struct pt_regs *regs, bool hardirq, u64 latency)
TASK_COMM_LEN);
stack_trace->pids[nr_irqoff_trace] = current->pid;
stack_trace->latency[nr_irqoff_trace].nsecs = latency;
stack_trace->begin_timestamp[nr_irqoff_trace] = \
stack_trace->last_timestamp - latency;
stack_trace->latency[nr_irqoff_trace].more = !hardirq && regs;

trace = stack_trace->trace + nr_irqoff_trace;
Expand Down Expand Up @@ -511,6 +524,7 @@ static ssize_t trace_latency_write(struct file *file, const char __user *buf,
static void trace_latency_show_one(struct seq_file *m, void *v, bool hardirq)
{
int cpu;
char start_time[128]={0};

for_each_online_cpu(cpu) {
int i;
Expand All @@ -533,12 +547,14 @@ static void trace_latency_show_one(struct seq_file *m, void *v, bool hardirq)

for (i = 0; i < nr_irqoff_trace; i++) {
struct irqoff_trace *trace = stack_trace->trace + i;
memset(start_time,0,sizeof(start_time));
time_to_sec(stack_trace->begin_timestamp[i],start_time);

seq_printf(m, "%*cCOMMAND: %s PID: %d LATENCY: %lu%s\n",
5, ' ', stack_trace->comms[i],
seq_printf(m, "%*cCOMMAND: %s PID: %d LATENCY: %lu%s %s\n",
6, ' ', stack_trace->comms[i],
stack_trace->pids[i],
stack_trace->latency[i].nsecs / (1000 * 1000UL),
stack_trace->latency[i].more ? "+ms" : "ms");
stack_trace->latency[i].more ? "+ms" : "ms",start_time);
seq_print_stack_trace(m, trace);
seq_putc(m, '\n');

Expand All @@ -563,6 +579,7 @@ static int trace_latency_show(struct seq_file *m, void *v)
return 0;
}


static int trace_latency_open(struct inode *inode, struct file *file)
{
return single_open(file, trace_latency_show, inode->i_private);
Expand Down