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SubjectRe: FTRACE: regression in 31-rc7

On Thu, 27 Aug 2009, Gregory Haskins wrote:

> Hi Steve,
>
> Steven Rostedt wrote:
> instrumented for some reason.
> >
> > Hmm, so you think something with the modules broke? I can test that out
> > here.
>
> Thats my (admittedly fairly ignorant) theory based on the limited data
> samples I have in front of me. :)
>
> If I get a chance later, I will try to do something more scientific, or
> at least a bisect.

I just did this:

# uname -r
2.6.31-rc7
# echo :mod:ext3 > set_ftrace_filter
# echo function_graph > current_tracer
# cat trace
# tracer: function_graph
#
# CPU DURATION FUNCTION CALLS
# | | | | | | |
1) 6.928 us | ext3_permission();
1) 1.234 us | ext3_permission();
------------------------------------------
1) gdm-bin-3477 => pcscd-2951
------------------------------------------

1) 1.306 us | ext3_permission();
1) 1.314 us | ext3_permission();
1) 1.244 us | ext3_permission();
1) 1.364 us | ext3_permission();
1) 1.251 us | ext3_permission();
1) 1.473 us | ext3_permission();
1) 1.306 us | ext3_permission();
1) 1.401 us | ext3_permission();
1) 1.243 us | ext3_permission();
1) 1.301 us | ext3_permission();
1) 1.439 us | ext3_permission();
1) 1.239 us | ext3_permission();
1) 1.331 us | ext3_permission();
1) 1.423 us | ext3_permission();
1) 1.243 us | ext3_permission();
1) 1.321 us | ext3_permission();
------------------------------------------
1) pcscd-2951 => gdm-bin-3477
------------------------------------------

1) 2.567 us | ext3_permission();
1) 1.139 us | ext3_permission();
1) 2.329 us | ext3_permission();
1) 1.246 us | ext3_permission();
1) 1.321 us | ext3_permission();
1) 0.989 us | ext3_permission();
1) 1.261 us | ext3_permission();
1) 1.209 us | ext3_permission();
1) 1.221 us | ext3_permission();
1) 0.968 us | ext3_permission();
1) 2.319 us | ext3_permission();
1) 1.221 us | ext3_permission();
1) 2.199 us | ext3_permission();
1) 1.269 us | ext3_permission();
------------------------------------------
1) gdm-bin-3477 => bash-3198
------------------------------------------

1) 2.852 us | ext3_permission();
1) | ext3_readdir() {
1) 1.249 us | free_rb_tree_fname();
1) | ext3_htree_fill_tree() {
1) | htree_dirblock_to_tree() {
1) | ext3_bread() {
1) | ext3_getblk() {
1) | ext3_get_blocks_handle() {
1) 1.046 us | ext3_block_to_path();


This is with the latest Linus git:

commit 1e23502cc57cef33455ac7cb9111e3c6d991a894
Merge: e99b1f2... 3161e45...
Author: Linus Torvalds <torvalds@linux-foundation.org>
Date: Wed Aug 26 20:54:48 2009 -0700

-- Steve



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