hello,
I want to monitor multiple processes simultaneously(5 or more), and I set
every context flag to PFM_FL_NOTIFY_BLOCK,
after I get the message PFM_MSG_OVFL, first I stop the process by
PTRACE_ATTACH, then process the buffer, then restart
perfmon by perfmonctl(PFM_RESTART), at last let the process run by
PTRACE_DETACH.
The problem is I can only got the overflow message once, after DETACH the
process, the process itself seemed
continued, but perfmon is still stop, I remove the context flag
"PFM_FL_NOTIFY_BLOCK", all seemed works well.
What's the problem? Thank You
2008-08-05
xudi
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