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ftrace: Move setting of clock-source out of options

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There are many clock sources for the tracing system but we can only
enable/disable one at a time with the trace/options file.
We can move the setting of clock-source out of options and add a separate
file for it:
 # cat trace_clock
 [local] global
 # echo global > trace_clock
 # cat trace_clock
 local [global]

Signed-off-by: Zhao Lei <zhaolei@cn.fujitsu.com>
LKML-Reference: <4A939D08.6050604@cn.fujitsu.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Zhaolei 2009-08-25 16:12:56 +08:00 committed by Steven Rostedt
parent 87a342f5db
commit 5079f3261f
2 changed files with 79 additions and 20 deletions
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92
kernel/trace/trace.c
View File

@ -323,12 +323,21 @@ static const char *trace_options[] = {
"printk-msg-only",
"context-info",
"latency-format",
"global-clock",
"sleep-time",
"graph-time",
NULL
};
static struct {
u64 (*func)(void);
const char *name;
} trace_clocks[] = {
{ trace_clock_local, "local" },
{ trace_clock_global, "global" },
};
int trace_clock_id;
/*
* ftrace_max_lock is used to protect the swapping of buffers
* when taking a max snapshot. The buffers themselves are
@ -2159,22 +2168,6 @@ static void set_tracer_flags(unsigned int mask, int 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
@ -3142,6 +3135,62 @@ tracing_mark_write(struct file *filp, const char __user *ubuf,
return cnt;
}
static ssize_t tracing_clock_read(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
char buf[64];
int bufiter = 0;
int i;
for (i = 0; i < ARRAY_SIZE(trace_clocks); i++)
bufiter += snprintf(buf + bufiter, sizeof(buf) - bufiter,
"%s%s%s%s", i ? " " : "",
i == trace_clock_id ? "[" : "", trace_clocks[i].name,
i == trace_clock_id ? "]" : "");
bufiter += snprintf(buf + bufiter, sizeof(buf) - bufiter, "\n");
return simple_read_from_buffer(ubuf, cnt, ppos, buf, bufiter);
}
static ssize_t tracing_clock_write(struct file *filp, const char __user *ubuf,
size_t cnt, loff_t *fpos)
{
char buf[64];
const char *clockstr;
int i;
if (cnt >= sizeof(buf))
return -EINVAL;
if (copy_from_user(&buf, ubuf, cnt))
return -EFAULT;
buf[cnt] = 0;
clockstr = strstrip(buf);
for (i = 0; i < ARRAY_SIZE(trace_clocks); i++) {
if (strcmp(trace_clocks[i].name, clockstr) == 0)
break;
}
if (i == ARRAY_SIZE(trace_clocks))
return -EINVAL;
trace_clock_id = i;
mutex_lock(&trace_types_lock);
ring_buffer_set_clock(global_trace.buffer, trace_clocks[i].func);
if (max_tr.buffer)
ring_buffer_set_clock(max_tr.buffer, trace_clocks[i].func);
mutex_unlock(&trace_types_lock);
*fpos += cnt;
return cnt;
}
static const struct file_operations tracing_max_lat_fops = {
.open = tracing_open_generic,
.read = tracing_max_lat_read,
@ -3179,6 +3228,12 @@ static const struct file_operations tracing_mark_fops = {
.write = tracing_mark_write,
};
static const struct file_operations trace_clock_fops = {
.open = tracing_open_generic,
.read = tracing_clock_read,
.write = tracing_clock_write,
};
struct ftrace_buffer_info {
struct trace_array *tr;
void *spare;
@ -3918,6 +3973,9 @@ static __init int tracer_init_debugfs(void)
trace_create_file("saved_cmdlines", 0444, d_tracer,
NULL, &tracing_saved_cmdlines_fops);
trace_create_file("trace_clock", 0644, d_tracer, NULL,
&trace_clock_fops);
#ifdef CONFIG_DYNAMIC_FTRACE
trace_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt, &tracing_dyn_info_fops);

7
kernel/trace/trace.h
View File

@ -568,6 +568,8 @@ trace_vprintk(unsigned long ip, const char *fmt, va_list args);
extern unsigned long trace_flags;
extern int trace_clock_id;
/* Standard output formatting function used for function return traces */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
extern enum print_line_t print_graph_function(struct trace_iterator *iter);
@ -656,9 +658,8 @@ enum trace_iterator_flags {
TRACE_ITER_PRINTK_MSGONLY = 0x10000,
TRACE_ITER_CONTEXT_INFO = 0x20000, /* Print pid/cpu/time */
TRACE_ITER_LATENCY_FMT = 0x40000,
TRACE_ITER_GLOBAL_CLK = 0x80000,
TRACE_ITER_SLEEP_TIME = 0x100000,
TRACE_ITER_GRAPH_TIME = 0x200000,
TRACE_ITER_SLEEP_TIME = 0x80000,
TRACE_ITER_GRAPH_TIME = 0x100000,
};
/*