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authorSteven Rostedt <rostedt@goodmis.org>2008-10-30 16:08:33 -0400
committerIngo Molnar <mingo@elte.hu>2008-10-30 21:30:09 +0100
commitb807c3d0f8e39ed7cbbbe6da162650e305e8de15 (patch)
tree59d2d75f221099bf5df7d6bcb71eaa63b6f424e8 /kernel/trace/trace.c
parent17666f02b118099028522dfc3df00a235700e216 (diff)
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ftrace: nmi update statistics
Impact: add more debug info to /debugfs/tracing/dyn_ftrace_total_info This patch adds dynamic ftrace NMI update statistics to the /debugfs/tracing/dyn_ftrace_total_info stat file. Signed-off-by: Steven Rostedt <srostedt@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace.c')
-rw-r--r--kernel/trace/trace.c31
1 files changed, 24 insertions, 7 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index a610ca77155..bc36febc077 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -2815,22 +2815,39 @@ static struct file_operations tracing_mark_fops = {
#ifdef CONFIG_DYNAMIC_FTRACE
+#define DYN_INFO_BUF_SIZE 1023
+static char ftrace_dyn_info_buffer[DYN_INFO_BUF_SIZE+1];
+static DEFINE_MUTEX(dyn_info_mutex);
+
+int __weak ftrace_arch_read_dyn_info(char *buf, int size)
+{
+ return 0;
+}
+
static ssize_t
-tracing_read_long(struct file *filp, char __user *ubuf,
+tracing_read_dyn_info(struct file *filp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
unsigned long *p = filp->private_data;
- char buf[64];
+ char *buf = ftrace_dyn_info_buffer;
int r;
- r = sprintf(buf, "%ld\n", *p);
+ mutex_lock(&dyn_info_mutex);
+ r = sprintf(buf, "%ld ", *p);
- return simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+ r += ftrace_arch_read_dyn_info(buf+r, DYN_INFO_BUF_SIZE-r);
+ buf[r++] = '\n';
+
+ r = simple_read_from_buffer(ubuf, cnt, ppos, buf, r);
+
+ mutex_unlock(&dyn_info_mutex);
+
+ return r;
}
-static struct file_operations tracing_read_long_fops = {
+static struct file_operations tracing_dyn_info_fops = {
.open = tracing_open_generic,
- .read = tracing_read_long,
+ .read = tracing_read_dyn_info,
};
#endif
@@ -2939,7 +2956,7 @@ static __init int tracer_init_debugfs(void)
#ifdef CONFIG_DYNAMIC_FTRACE
entry = debugfs_create_file("dyn_ftrace_total_info", 0444, d_tracer,
&ftrace_update_tot_cnt,
- &tracing_read_long_fops);
+ &tracing_dyn_info_fops);
if (!entry)
pr_warning("Could not create debugfs "
"'dyn_ftrace_total_info' entry\n");