On Mon, May 12, 2014 at 04:20:44PM +0800, kaixu xia wrote:

2014-05-12 16:05 GMT+08:00 Peter Zijlstra [off-list ref]:

quoted

On Mon, May 12, 2014 at 03:52:54PM +0800, xiakaixu wrote:

quoted

Hi guys,

Does perf support different length of user-space hw_breakpoint,
such as  HW_BREAKPOINT_LEN_1/HW_BREAKPOINT_LEN_2/HW_BREAKPOINT_LEN_4/
HW_BREAKPOINT_LEN_8?

Seems perf only support HW_BREAKPOINT_LEN_4/sizeof(long)
by default from the source code and simple test.

May I have your opinions if I want to trace different bytes of
hw_breakpoint addr?

Frederic?

Sorry, can not fully understand it. Can you give more details on that?

I asked Frederic to answer your question :-)