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SubjectRe: Pin-pointing the root of unusual application latencies
Karsten Wiese wrote:

> John Sigler wrote:
>
>> Is there some form of priority inheritance? Does the IRQ handler get a
>> priority boost if a high priority task is waiting for it?
>
> No. But that would be "nice to have".

No to the first question? to the second question? or to both? :-)

In kernel/futex.c does "PI" stand for Priority Inheritance?

e.g.

/*
* Priority Inheritance state:
*/
struct futex_pi_state {
/*
* list of 'owned' pi_state instances - these have to be
* cleaned up in do_exit() if the task exits prematurely:
*/
struct list_head list;

/*
* The PI object:
*/
struct rt_mutex pi_mutex;

struct task_struct *owner;
atomic_t refcount;

union futex_key key;
};
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