!wmitrace.logdump

I’m using WPP on user-mode application. And try to include the log into the dump file if crash happen. I’ve already used the tracelog with the buffering switch to start the session. However, when I used the Windbg to open the dump file and used !wmitrace.strdump, I didn’t see any trace session. Can anyone share me any ideas how to make it? Thanks a lot.