trace: Add an option to show tgids in trace output
The tgids are tracked along side the saved_cmdlines tracking, and can be included in trace output by enabling the 'print-tgid' trace option. This is useful when doing post-processing of the trace data, as it allows events to be grouped by tgid. Change-Id: I52ed04c3a8ca7fddbb868b792ce5d21ceb76250e Signed-off-by: Jamie Gennis <jgennis@google.com>
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e2dba5ee5f
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6019e59489
3 changed files with 110 additions and 6 deletions
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@ -1352,6 +1352,7 @@ void tracing_reset_all_online_cpus(void)
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#define SAVED_CMDLINES_DEFAULT 128
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#define NO_CMDLINE_MAP UINT_MAX
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static unsigned saved_tgids[SAVED_CMDLINES];
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static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED;
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struct saved_cmdlines_buffer {
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unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
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@ -1590,7 +1591,7 @@ static int trace_save_cmdline(struct task_struct *tsk)
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}
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set_cmdline(idx, tsk->comm);
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saved_tgids[idx] = tsk->tgid;
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arch_spin_unlock(&trace_cmdline_lock);
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return 1;
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@ -1633,6 +1634,25 @@ void trace_find_cmdline(int pid, char comm[])
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preempt_enable();
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}
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int trace_find_tgid(int pid)
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{
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unsigned map;
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int tgid;
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preempt_disable();
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arch_spin_lock(&trace_cmdline_lock);
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map = map_pid_to_cmdline[pid];
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if (map != NO_CMDLINE_MAP)
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tgid = saved_tgids[map];
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else
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tgid = -1;
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arch_spin_unlock(&trace_cmdline_lock);
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preempt_enable();
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return tgid;
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}
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void tracing_record_cmdline(struct task_struct *tsk)
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{
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if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
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@ -2583,6 +2603,13 @@ static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
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"# | | | | |\n");
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}
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static void print_func_help_header_tgid(struct trace_buffer *buf, struct seq_file *m)
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{
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print_event_info(buf, m);
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seq_puts(m, "# TASK-PID TGID CPU# TIMESTAMP FUNCTION\n");
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seq_puts(m, "# | | | | | |\n");
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}
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static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
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{
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print_event_info(buf, m);
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@ -2595,6 +2622,18 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
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"# | | | |||| | |\n");
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}
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static void print_func_help_header_irq_tgid(struct trace_buffer *buf, struct seq_file *m)
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{
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print_event_info(buf, m);
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seq_puts(m, "# _-----=> irqs-off\n");
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seq_puts(m, "# / _----=> need-resched\n");
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seq_puts(m, "# | / _---=> hardirq/softirq\n");
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seq_puts(m, "# || / _--=> preempt-depth\n");
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seq_puts(m, "# ||| / delay\n");
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seq_puts(m, "# TASK-PID TGID CPU# |||| TIMESTAMP FUNCTION\n");
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seq_puts(m, "# | | | | |||| | |\n");
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}
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void
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print_trace_header(struct seq_file *m, struct trace_iterator *iter)
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{
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@ -2907,9 +2946,15 @@ void trace_default_header(struct seq_file *m)
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} else {
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if (!(trace_flags & TRACE_ITER_VERBOSE)) {
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if (trace_flags & TRACE_ITER_IRQ_INFO)
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print_func_help_header_irq(iter->trace_buffer, m);
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if (trace_flags & TRACE_ITER_TGID)
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print_func_help_header_irq_tgid(iter->trace_buffer, m);
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else
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print_func_help_header_irq(iter->trace_buffer, m);
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else
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print_func_help_header(iter->trace_buffer, m);
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if (trace_flags & TRACE_ITER_TGID)
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print_func_help_header_tgid(iter->trace_buffer, m);
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else
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print_func_help_header(iter->trace_buffer, m);
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}
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}
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}
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@ -4160,6 +4205,50 @@ static void trace_insert_enum_map(struct module *mod,
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trace_insert_enum_map_file(mod, start, len);
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}
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static ssize_t
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tracing_saved_tgids_read(struct file *file, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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{
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char *file_buf;
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char *buf;
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int len = 0;
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int pid;
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int i;
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file_buf = kmalloc(SAVED_CMDLINES*(16+1+16), GFP_KERNEL);
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if (!file_buf)
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return -ENOMEM;
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buf = file_buf;
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for (i = 0; i < SAVED_CMDLINES; i++) {
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int tgid;
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int r;
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pid = map_cmdline_to_pid[i];
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if (pid == -1 || pid == NO_CMDLINE_MAP)
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continue;
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tgid = trace_find_tgid(pid);
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r = sprintf(buf, "%d %d\n", pid, tgid);
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buf += r;
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len += r;
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}
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len = simple_read_from_buffer(ubuf, cnt, ppos,
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file_buf, len);
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kfree(file_buf);
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return len;
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}
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static const struct file_operations tracing_saved_tgids_fops = {
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.open = tracing_open_generic,
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.read = tracing_saved_tgids_read,
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.llseek = generic_file_llseek,
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};
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static ssize_t
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tracing_set_trace_read(struct file *filp, char __user *ubuf,
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size_t cnt, loff_t *ppos)
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@ -6784,6 +6873,9 @@ init_tracer_tracefs(struct trace_array *tr, struct dentry *d_tracer)
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trace_create_file("trace_marker", 0220, d_tracer,
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tr, &tracing_mark_fops);
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trace_create_file("saved_tgids", 0444, d_tracer,
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tr, &tracing_saved_tgids_fops);
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trace_create_file("trace_clock", 0644, d_tracer, tr,
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&trace_clock_fops);
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@ -656,6 +656,7 @@ static inline void __trace_stack(struct trace_array *tr, unsigned long flags,
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extern cycle_t ftrace_now(int cpu);
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extern void trace_find_cmdline(int pid, char comm[]);
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extern int trace_find_tgid(int pid);
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#ifdef CONFIG_DYNAMIC_FTRACE
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extern unsigned long ftrace_update_tot_cnt;
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@ -970,7 +971,8 @@ extern int trace_get_user(struct trace_parser *parser, const char __user *ubuf,
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FUNCTION_FLAGS \
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FGRAPH_FLAGS \
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STACK_FLAGS \
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BRANCH_FLAGS
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BRANCH_FLAGS \
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C(TGID, "print-tgid"),
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/*
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* By defining C, we can make TRACE_FLAGS a list of bit names
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@ -526,11 +526,21 @@ int trace_print_context(struct trace_iterator *iter)
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unsigned long long t;
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unsigned long secs, usec_rem;
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char comm[TASK_COMM_LEN];
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int tgid;
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trace_find_cmdline(entry->pid, comm);
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trace_seq_printf(s, "%16s-%-5d [%03d] ",
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comm, entry->pid, iter->cpu);
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trace_seq_printf(s, "%16s-%-5d ", comm, entry->pid);
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if (tr->trace_flags & TRACE_ITER_TGID) {
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tgid = trace_find_tgid(entry->pid);
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if (tgid < 0)
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trace_seq_puts(s, "(-----) ");
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else
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trace_seq_printf(s, "(%5d) ", tgid);
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}
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trace_seq_printf(s, "[%03d] ", iter->cpu);
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if (tr->trace_flags & TRACE_ITER_IRQ_INFO)
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trace_print_lat_fmt(s, entry);
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