What is the exact meaning of this parameter ?

Hi all,

I know that the perf_event_mlock_kb kernel parameter allows to limit the amount of counters sampling memory that can be mmap'ed by an unprivileged user.

Nevertheless, playing with the size I give to mmap some memory using the file descriptor returned by perf_event_open I am not able to linkk with the perf_event_mlock_kb parameter. Looking into kernel sources, it seems this parameter is used in kernel/events/core.c where the perf mmap operation is defined but I am not sure to understand the code there. So my question is what is the exact meaning of this parameter ?

Manu

Any idea on that ?

Thanks,

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Manu