return nsec;
}
-cycle_t ftrace_now(int cpu)
-{
- u64 ts = ring_buffer_time_stamp(cpu);
- ring_buffer_normalize_time_stamp(cpu, &ts);
- return ts;
-}
-
/*
* The global_trace is the descriptor that holds the tracing
* buffers for the live tracing. For each CPU, it contains
static DEFINE_PER_CPU(struct trace_array_cpu, global_trace_cpu);
+cycle_t ftrace_now(int cpu)
+{
+ u64 ts;
+
+ /* Early boot up does not have a buffer yet */
+ if (!global_trace.buffer)
+ return trace_clock_local();
+
+ ts = ring_buffer_time_stamp(global_trace.buffer, cpu);
+ ring_buffer_normalize_time_stamp(global_trace.buffer, cpu, &ts);
+
+ return ts;
+}
+
/*
* The max_tr is used to snapshot the global_trace when a maximum
* latency is reached. Some tracers will use this to store a maximum
"printk-msg-only",
"context-info",
"latency-format",
+ "global-clock",
NULL
};
}
#define SAVED_CMDLINES 128
+#define NO_CMDLINE_MAP UINT_MAX
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 void trace_init_cmdlines(void)
{
- memset(&map_pid_to_cmdline, -1, sizeof(map_pid_to_cmdline));
- memset(&map_cmdline_to_pid, -1, sizeof(map_cmdline_to_pid));
+ memset(&map_pid_to_cmdline, NO_CMDLINE_MAP, sizeof(map_pid_to_cmdline));
+ memset(&map_cmdline_to_pid, NO_CMDLINE_MAP, sizeof(map_cmdline_to_pid));
cmdline_idx = 0;
}
static void trace_save_cmdline(struct task_struct *tsk)
{
- unsigned map;
- unsigned idx;
+ unsigned pid, idx;
if (!tsk->pid || unlikely(tsk->pid > PID_MAX_DEFAULT))
return;
return;
idx = map_pid_to_cmdline[tsk->pid];
- if (idx >= SAVED_CMDLINES) {
+ if (idx == NO_CMDLINE_MAP) {
idx = (cmdline_idx + 1) % SAVED_CMDLINES;
- map = map_cmdline_to_pid[idx];
- if (map <= PID_MAX_DEFAULT)
- map_pid_to_cmdline[map] = (unsigned)-1;
+ /*
+ * Check whether the cmdline buffer at idx has a pid
+ * mapped. We are going to overwrite that entry so we
+ * need to clear the map_pid_to_cmdline. Otherwise we
+ * would read the new comm for the old pid.
+ */
+ pid = map_cmdline_to_pid[idx];
+ if (pid != NO_CMDLINE_MAP)
+ map_pid_to_cmdline[pid] = NO_CMDLINE_MAP;
+ map_cmdline_to_pid[idx] = tsk->pid;
map_pid_to_cmdline[tsk->pid] = idx;
cmdline_idx = idx;
__raw_spin_lock(&trace_cmdline_lock);
map = map_pid_to_cmdline[pid];
- if (map >= SAVED_CMDLINES)
- goto out;
-
- strcpy(comm, saved_cmdlines[map]);
+ if (map != NO_CMDLINE_MAP)
+ strcpy(comm, saved_cmdlines[map]);
+ else
+ strcpy(comm, "<...>");
- out:
__raw_spin_unlock(&trace_cmdline_lock);
}
void tracing_record_cmdline(struct task_struct *tsk)
{
- if (atomic_read(&trace_record_cmdline_disabled) || !tracing_is_on())
+ if (atomic_read(&trace_record_cmdline_disabled) || !tracer_enabled ||
+ !tracing_is_on())
return;
trace_save_cmdline(tsk);
return 0;
}
+static void set_tracer_flags(unsigned int mask, int enabled)
+{
+ /* do nothing if flag is already set */
+ if (!!(trace_flags & mask) == !!enabled)
+ return;
+
+ if (enabled)
+ trace_flags |= mask;
+ else
+ trace_flags &= ~mask;
+
+ if (mask == TRACE_ITER_GLOBAL_CLK) {
+ u64 (*func)(void);
+
+ if (enabled)
+ func = trace_clock_global;
+ else
+ func = trace_clock_local;
+
+ mutex_lock(&trace_types_lock);
+ ring_buffer_set_clock(global_trace.buffer, func);
+
+ if (max_tr.buffer)
+ ring_buffer_set_clock(max_tr.buffer, func);
+ mutex_unlock(&trace_types_lock);
+ }
+}
+
static ssize_t
tracing_trace_options_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *ppos)
int len = strlen(trace_options[i]);
if (strncmp(cmp, trace_options[i], len) == 0) {
- if (neg)
- trace_flags &= ~(1 << i);
- else
- trace_flags |= (1 << i);
+ set_tracer_flags(1 << i, !neg);
break;
}
}