International Business Machines Corporation

Manish Kulshreshtha

Dilip Singh

Shajith Chandran

Joshi Chandran

Anil Kumar Singh

Ismail Shamirulla Khan

Janice Margaret O'Brien

An apparatus for monitoring changes to a block of data is disclosed. A first hardware watchpoint is set to monitor changes to the block of data at a current location of the block of data in memory and a second hardware watchpoint is set to monitor changes at a selected location in the memory where a reference to the block of data is located. Responsive to the second hardware watchpoint being triggered by a change at the selected location where the reference to the block of data is located, a new location of the block of data in the memory is identified based on the change that triggered the second hardware watchpoint. Subsequent to identifying the new location of the block of data, the first hardware watchpoint is reset to monitor changes to the block of data at the new location of the block of data.

Dynamic hardware watchpoint

A method and apparatus for monitoring changes to a block of data is disclosed. A computer sets a first hardware watchpoint to monitor changes to the block of data at a current location of the block of data in memory and a second hardware watchpoint to monitor changes at a selected location in the memory where a reference to the block of data is located. Responsive to the second hardware watchpoint being triggered by a change at the selected location where the reference to the block of data is located, the computer identifies a new location of the block of data in the memory based on the change that triggered the second hardware watchpoint. Subsequent to identifying the new location of the block of data, the computer then resets the first hardware watchpoint to monitor changes to the block of data at the new location of the block of data.

An approach to providing multiple concurrently executing debugging sessions for a currently executing operating system. The approach involves providing one first debugging session for debugging the currently executing operating system. The first debugging session has read access and write access to the data of the currently executing operating system. The approach also involves providing one or more second debugging sessions for the currently executing operating system. Each of the second debugging sessions has read-only access to the data of the currently executing operating system. The second debugging sessions run simultaneously with the first debugging session if the second debugging sessions are started while the first debugging session is active. As a result, multiple users can simultaneously debug the currently executing operating system. A lock may be used to ensure that only the first debugging session has write access to the data. The lock may be shared between the various debugging sessions for the operating system.

Virtual debugging sessions

A method of processing multiple workload using virtualized operating system environments. The creation of a new user in a global operating system may automatically cause the creation of a working partition (WPAR) instance. The user will be associated with the WPAR instance and a virtualized operating system environment will be created from the global operating system within the WPAR instance. Within the WPAR instance, the user may be assigned a root identification which enables the user to have root access privileges to perform operations or processes that may only be performed by a root user. The removal of a user from the system also results in the deletion of the associated WPAR.

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Tamil Nadu, India

Manish Kulshreshtha