Idle transitions sampling with execution context

A method comprising:

• setting a processor affinity of a next dispatched monitored thread to a first value, wherein the next dispatched monitored thread executes on a current processor without being able to migrate to a different processor while a next dispatched monitored thread call stack is being retrieved;
• retrieving the next dispatched monitored thread call stack;
• and
• restoring the processor affinity of the next dispatched monitored thread to a second value after the next dispatched monitored thread call stack has been retrieved, wherein the next dispatched monitored thread migrates to a different processor to continue execution;
• and
• record the next dispatched monitored thread call stack for a subsequently dispatched monitored thread.

A system comprising:

• processors;
• and
• storage coupled to the processors, wherein the storage has stored thereon program code, and wherein at least one of the processors is configured to execute the program code to perform operations, wherein the operations comprise:
• setting a processor affinity of a next dispatched monitored thread to a first value, wherein the next dispatched monitored thread executes on a current processor without being able to migrate to a different processor while a next dispatched monitored thread call stack is being retrieved;
• retrieving the next dispatched monitored thread call stack;
• and
• restoring the processor affinity of the next dispatched monitored thread to a second value after the next dispatched monitored thread call stack has been retrieved, wherein the next dispatched monitored thread migrates to a different processor to continue execution;
• and
• record the next dispatched monitored thread call stack for a subsequently dispatched monitored thread.

A computer program product comprising a computer readable storage medium having a computer readable program, wherein the computer readable program when executed on a computer causes the computer to:

• set a processor affinity of a last dispatched monitored thread to a first value, wherein the last dispatched monitored thread executes on a current processor without being able to migrate to a different processor while a last dispatched monitored thread call stack is being retrieved;
• retrieve the last dispatched monitored thread call stack;
• and
• restore the processor affinity of the next dispatched monitored thread to a second value after the next dispatched monitored thread call stack has been retrieved, wherein the next dispatched monitored thread migrates to a different processor to continue execution;
• and
• record the next dispatched monitored thread call stack for a subsequently dispatched monitored thread.