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tracing/stat: change dummpy_cmp() to return -1 

Currently the output of trace_stat/workqueues is totally reversed:

 # cat /debug/tracing/trace_stat/workqueues
    ...
    1       17       17      210       37   `-blk_unplug_work+0x0/0x57
    1     3779     3779      181       11   |-cfq_kick_queue+0x0/0x2f
    1     3796     3796                     kblockd/1:120
    ...

The correct output should be:

    1     3796     3796                     kblockd/1:120
    1     3779     3779      181       11   |-cfq_kick_queue+0x0/0x2f
    1       17       17      210       37   `-blk_unplug_work+0x0/0x57

It's caused by "tracing/stat: replace linked list by an rbtree for
sorting"
(53059c9b67a62a3dc8c80204d3da42b9267ea5a0).

dummpy_cmp() should return -1, so rb_node will always be inserted as
right-most node in the rbtree, thus we sort the output in ascending
order.

[ Impact: fix the output of trace_stat/workqueues ]

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
This commit is contained in:
Li Zefan 2009-05-27 11:04:26 +08:00 committed by Frederic Weisbecker
parent 8f184f2730
commit b3dd7ba7d8
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_stat.c
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@ -127,7 +127,7 @@ insert_stat(struct rb_root *root, struct stat_node *data, cmp_stat_t cmp)
*/ */
static int dummy_cmp(void *p1, void *p2) static int dummy_cmp(void *p1, void *p2)
{ {
return 1; return -1;
} }
/* /*