Method and apparatus for obtaining a call stack to an event of interest and analyzing the same

摘要

In one embodiment, a processor includes a performance monitor including a last branch record (LBR) stack to store a call stack to an event of interest, where the call stack is collected responsive to a trigger for the event. The processor further includes logic to control the LBR stack to operate in a call stack mode such that an entry to a call instruction for a leaf function is cleared on return from the leaf function. Other embodiments are described and claimed.

主权项

1. A processor comprising:
an execution unit; a plurality of registers coupled to the execution unit, each of the plurality of registers to store at least one of source and destination address information of a branch taken during program execution; and a logic coupled to the plurality of registers to control the plurality of registers to operate:
in a call stack mode to cause storage in the plurality of registers of call information of one or more functions to provide a call stack to an event, wherein in the call stack mode, a call to a leaf function is to be removed from a register on return from the leaf function; andin a second mode to cause storage in the plurality of registers of branch records for taken branches.