A patch is file used to alter a source code package, e.g. in order to correct a bug or add a feature.

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Patching Linux kernel on-line (i.e. without rebooting)

Sorry - I don't remember the exact name. I know there is mechanism to patch the kernel at runtime by loading modules without need of the reboot as long as the structures involved are not affected. It ...
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Does the Linux PreemptRT patch benefit desktop users?

Does the PREEMPT_RT patch (real-time kernel) have any benefit for regular desktop users?
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Kernel memory allocator patch

Is there any patch for Linux kernel to use different memory allocators, such as ned allocator or TLSF allocator?