IBM Mainframe Discussion List <[email protected]> wrote on 06/06/2007 01:37:05 PM:
> How big is this processor trace table? From reading the PoOps, I deduce > that it must be 4K, since a trace table exception interrupt is created if the > next available trace table entry address would be in the next higher 4K of > storage. I am guessing that when this interrupt occurs, the programinterrupt > SLIH moves the contents of this 4K into a much large System Trace > Table, which > is a wrap-around table, and then resets Control Register 12 to point to the > beginning of the 4K storage block containing the hardware Trace > Table for that > particular processor. Trace interrupt processing simply changes CR 12 to point to the beginning of the next buffer for that CPU. There is no copying done at this point. > The large System Trace Table is the one that shows up > in a formatted dump. RTM2 or SDUMP requests the Trace component to make a copy of all of the trace buffers for all CPUs. This is called a trace snapshot, and this is what is dumped in a SNAP, SYSMDUMP, IEATDUMP, or SDUMP. Jim Mulder z/OS System Test IBM Corp. Poughkeepsie, NY ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
