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authorLi Zefan <lizf@cn.fujitsu.com>2009-08-17 16:52:53 +0800
committerIngo Molnar <mingo@elte.hu>2009-08-17 11:25:09 +0200
commit97d53202a5670a08b79c8ef2e4fff1c1ee21317c (patch)
tree5ba925559a3031a833c5803d05a0a43e13ea1866 /kernel/trace/trace_stat.c
parentba8b3a40ba7e06d00c27508f090803af90e8dbbf (diff)
downloadop-kernel-dev-97d53202a5670a08b79c8ef2e4fff1c1ee21317c.zip
op-kernel-dev-97d53202a5670a08b79c8ef2e4fff1c1ee21317c.tar.gz
trace_stat: Fix missing entry in stat file
One entry is missing in the output of a stat file. The cause is, when stat_seq_start() is called the 2nd time, we should start from the (pos-1)th elem in the rbtree but not pos, because pos == 0 is the header. Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <4A891A65.70009@cn.fujitsu.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/trace/trace_stat.c')
-rw-r--r--kernel/trace/trace_stat.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
index 07c60b0..a4bb239 100644
--- a/kernel/trace/trace_stat.c
+++ b/kernel/trace/trace_stat.c
@@ -203,17 +203,21 @@ static void *stat_seq_start(struct seq_file *s, loff_t *pos)
{
struct stat_session *session = s->private;
struct rb_node *node;
+ int n = *pos;
int i;
/* Prevent from tracer switch or rbtree modification */
mutex_lock(&session->stat_mutex);
/* If we are in the beginning of the file, print the headers */
- if (!*pos && session->ts->stat_headers)
- return SEQ_START_TOKEN;
+ if (session->ts->stat_headers) {
+ if (n == 0)
+ return SEQ_START_TOKEN;
+ n--;
+ }
node = rb_first(&session->stat_root);
- for (i = 0; node && i < *pos; i++)
+ for (i = 0; node && i < n; i++)
node = rb_next(node);
return node;
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