Ingo Molnar

Ingo Molnár
Nationality	Hungarian
Occupation	Programmer
Employer	Red Hat
Known for	Completely Fair Scheduler

Ingo Molnár, employed by Red Hat as of May 2013, is a Hungarian Linux hacker. He is best known for his contributions to the operating system in terms of security and performance.

Molnár studied at the Eötvös Loránd University.

Some of his additions to the Linux kernel include the O(1) scheduler of Linux-2.6.0 and the Completely Fair Scheduler of Linux-2.6.23, the in-kernel TUX HTTP / server, as well as his work to enhance thread handling. He also wrote a kernel security feature called "Exec Shield", which prevents stack-based buffer overflow exploits in the x86 architecture by disabling the execute permission for the stack.

Together with Thomas Gleixner, he worked on the real-time preemption (PREEMPT_RT) patch set, which aims to reduce the maximum thread switching latency of the Linux kernel from an unbounded number of milliseconds to down to bounded values in the order of tens of microseconds (depending on the system). As of 2011, Thomas Gleixner is working on further improving the patch and getting important infrastructure patches of the patch set merged into the Mainline Linux kernel.

Between Linux 2.6.21 and Linux 2.6.24, he worked on the Completely Fair Scheduler (CFS) which was inspired by the scheduler work of Con Kolivas. CFS replaced the previous process scheduler of the Linux kernel with Linux-2.6.23.

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