Re: [PATCH v2 2.6.38-rc8-tip 0/20] 0: Inode based uprobes

Thomas Gleixner
2011-03-15T01:36:46Z

On Mon, 14 Mar 2011, Frank Ch. Eigler wrote:
> akpm wrote:
>
> > [...] How do you envisage these features actually get used?
>
> Patch #20/20 in the set includes an ftrace-flavoured debugfs frontend.

And you really think that:

# cd /sys/kernel/debug/tracing/

# cat /proc/`pgrep zsh`/maps | grep /bin/zsh | grep r-xp
00400000-0048a000 r-xp 00000000 08:03 130904 /bin/zsh

# objdump -T /bin/zsh | grep -w zfree
0000000000446420 g DF .text 0000000000000012 Base zfree

# echo 'p /bin/zsh:0x46420 %ip %ax' > uprobe_events

# cat uprobe_events
p:uprobes/p_zsh_0x46420 /bin/zsh:0x0000000000046420

> TODO: Documentation/trace/uprobetrace.txt

without a reasonable documentation how to use that is a brilliant
argument?

> Previous versions of the patchset included perf front-ends too, which
> are probably to be seen again.

Ahh, probably. What does that mean?

And if that probably happens, what interface is that supposed to
use?

The above magic wrapped into perf ?

Or some sensible implementation ?

Thanks,

tglx