Apple Inc.

Katherine Blake Stone

David Vernon Payne

Daniel Mark Delwood

Daniel Andreas Steffen

Kenneth S Orr

Han Ming Ong

Jason Molenda

The present technology monitors events that allocate and deallocate virtual memory regions in a device, wherein the events include system calls from user space. The system can generate a log of events, and based on the log of events, track regions of virtual memory allocated and deallocated via the events. The system can also record events with corresponding stack traces. Next, the system can group recorded events having matching stack traces to yield event groupings, and instrument functions in a compiled code associated with the process to determine retain counts of respective events associated with the functions. The system can then automatically pair at least one of a first portion of the events and a second portion of the respective events based on the event groupings and the retain counts of the respective events to yield paired events.

Memory stack trace management tool

Memory management tools

When queuing work items for asynchronous execution, the approaches set forth herein enable a debugger to provide more meaningful and complete stack trace information for enqueued work items. An example system identifies a work item to be enqueued for asynchronous execution as a separate thread during runtime of a program. Upon enqueuing the work item in an execution queue, the system captures pre-queue stack trace information associated with the work item, and associates the pre-queue stack trace information with the work item. The system removes the work item from the execution queue for execution, wherein the execution is associated with current stack trace information separate from the pre-queue stack trace information. Upon detecting an event associated with executing the work item, the system merges the pre-queue stack trace information with the current stack trace information to yield a merged stack trace.

Queue debugging using stored backtrace information

Growing community of inventors

Santa Cruz, CA, United States of America

Katherine Blake Stone