Merge branch 'linux-linaro-lsk' into linux-linaro-lsk-android

[firefly-linux-kernel-4.4.55.git] / kernel / trace / trace.c

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index 21920add7972c40562e73efb48535d4b7ba36b84..bb9c36de8bfbe1d425caa3d8c48cc701d1b6c343 100644 (file)
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -722,6 +722,7 @@ static const char *trace_options[] = {
        "irq-info",
        "markers",
        "function-trace",
+       "print-tgid",
        NULL
 };
 
@@ -1234,6 +1235,7 @@ void tracing_reset_all_online_cpus(void)
 static unsigned map_pid_to_cmdline[PID_MAX_DEFAULT+1];
 static unsigned map_cmdline_to_pid[SAVED_CMDLINES];
 static char saved_cmdlines[SAVED_CMDLINES][TASK_COMM_LEN];
+static unsigned saved_tgids[SAVED_CMDLINES];
 static int cmdline_idx;
 static arch_spinlock_t trace_cmdline_lock = __ARCH_SPIN_LOCK_UNLOCKED;
 
@@ -1435,6 +1437,7 @@ static int trace_save_cmdline(struct task_struct *tsk)
        }
 
        memcpy(&saved_cmdlines[idx], tsk->comm, TASK_COMM_LEN);
+       saved_tgids[idx] = tsk->tgid;
 
        arch_spin_unlock(&trace_cmdline_lock);
 
@@ -1472,6 +1475,25 @@ void trace_find_cmdline(int pid, char comm[])
        preempt_enable();
 }
 
+int trace_find_tgid(int pid)
+{
+       unsigned map;
+       int tgid;
+
+       preempt_disable();
+       arch_spin_lock(&trace_cmdline_lock);
+       map = map_pid_to_cmdline[pid];
+       if (map != NO_CMDLINE_MAP)
+               tgid = saved_tgids[map];
+       else
+               tgid = -1;
+
+       arch_spin_unlock(&trace_cmdline_lock);
+       preempt_enable();
+
+       return tgid;
+}
+
 void tracing_record_cmdline(struct task_struct *tsk)
 {
        if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
@@ -2427,6 +2449,13 @@ static void print_func_help_header(struct trace_buffer *buf, struct seq_file *m)
        seq_puts(m, "#              | |       |          |         |\n");
 }
 
+static void print_func_help_header_tgid(struct trace_buffer *buf, struct seq_file *m)
+{
+       print_event_info(buf, m);
+       seq_puts(m, "#           TASK-PID    TGID   CPU#      TIMESTAMP  FUNCTION\n");
+       seq_puts(m, "#              | |        |      |          |         |\n");
+}
+
 static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file *m)
 {
        print_event_info(buf, m);
@@ -2439,6 +2468,18 @@ static void print_func_help_header_irq(struct trace_buffer *buf, struct seq_file
        seq_puts(m, "#              | |       |   ||||       |         |\n");
 }
 
+static void print_func_help_header_irq_tgid(struct trace_buffer *buf, struct seq_file *m)
+{
+       print_event_info(buf, m);
+       seq_puts(m, "#                                      _-----=> irqs-off\n");
+       seq_puts(m, "#                                     / _----=> need-resched\n");
+       seq_puts(m, "#                                    | / _---=> hardirq/softirq\n");
+       seq_puts(m, "#                                    || / _--=> preempt-depth\n");
+       seq_puts(m, "#                                    ||| /     delay\n");
+       seq_puts(m, "#           TASK-PID    TGID   CPU#  ||||    TIMESTAMP  FUNCTION\n");
+       seq_puts(m, "#              | |        |      |   ||||       |         |\n");
+}
+
 void
 print_trace_header(struct seq_file *m, struct trace_iterator *iter)
 {
@@ -2739,9 +2780,15 @@ void trace_default_header(struct seq_file *m)
        } else {
                if (!(trace_flags & TRACE_ITER_VERBOSE)) {
                        if (trace_flags & TRACE_ITER_IRQ_INFO)
-                               print_func_help_header_irq(iter->trace_buffer, m);
+                               if (trace_flags & TRACE_ITER_TGID)
+                                       print_func_help_header_irq_tgid(iter->trace_buffer, m);
+                               else
+                                       print_func_help_header_irq(iter->trace_buffer, m);
                        else
-                               print_func_help_header(iter->trace_buffer, m);
+                               if (trace_flags & TRACE_ITER_TGID)
+                                       print_func_help_header_tgid(iter->trace_buffer, m);
+                               else
+                                       print_func_help_header(iter->trace_buffer, m);
                }
        }
 }
@@ -3593,9 +3640,53 @@ tracing_saved_cmdlines_read(struct file *file, char __user *ubuf,
 }
 
 static const struct file_operations tracing_saved_cmdlines_fops = {
-    .open       = tracing_open_generic,
-    .read       = tracing_saved_cmdlines_read,
-    .llseek    = generic_file_llseek,
+       .open   = tracing_open_generic,
+       .read   = tracing_saved_cmdlines_read,
+       .llseek = generic_file_llseek,
+};
+
+static ssize_t
+tracing_saved_tgids_read(struct file *file, char __user *ubuf,
+                               size_t cnt, loff_t *ppos)
+{
+       char *file_buf;
+       char *buf;
+       int len = 0;
+       int pid;
+       int i;
+
+       file_buf = kmalloc(SAVED_CMDLINES*(16+1+16), GFP_KERNEL);
+       if (!file_buf)
+               return -ENOMEM;
+
+       buf = file_buf;
+
+       for (i = 0; i < SAVED_CMDLINES; i++) {
+               int tgid;
+               int r;
+
+               pid = map_cmdline_to_pid[i];
+               if (pid == -1 || pid == NO_CMDLINE_MAP)
+                       continue;
+
+               tgid = trace_find_tgid(pid);
+               r = sprintf(buf, "%d %d\n", pid, tgid);
+               buf += r;
+               len += r;
+       }
+
+       len = simple_read_from_buffer(ubuf, cnt, ppos,
+                                     file_buf, len);
+
+       kfree(file_buf);
+
+       return len;
+}
+
+static const struct file_operations tracing_saved_tgids_fops = {
+       .open   = tracing_open_generic,
+       .read   = tracing_saved_tgids_read,
+       .llseek = generic_file_llseek,
 };
 
 static ssize_t
@@ -6138,6 +6229,9 @@ init_tracer_debugfs(struct trace_array *tr, struct dentry *d_tracer)
        trace_create_file("trace_marker", 0220, d_tracer,
                          tr, &tracing_mark_fops);
 
+       trace_create_file("saved_tgids", 0444, d_tracer,
+                         tr, &tracing_saved_tgids_fops);
+
        trace_create_file("trace_clock", 0644, d_tracer, tr,
                          &trace_clock_fops);