Hi Mel,
Through my experiment in SMP system, I find the mm_page_alloc_zone_locked
event produced by the fork system call on one CPU might delay the task
on another CPU. According to the events-keme.txt in kernel documents,
the interrupts are disabled and cache lines between CPUs are dirtied
when this event happens. Therefore, I am afraid that a task might be
interfered by the tasks on different CPUs
which at the same time request memory from the buddy allocator.
My questions are as follows:
* Is it necessary to disable interrupts when allocating/freeing memory from
buddy system?
* Why the cache lines between CPUs are dirtied by the allocation in
buddy system?
Thanks,
- Kang
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