* What is the exact meaning of this parameter ?
@ 2015-05-27 16:55 Manuel Selva
2015-06-06 7:20 ` Manuel Selva
0 siblings, 1 reply; 2+ messages in thread
From: Manuel Selva @ 2015-05-27 16:55 UTC (permalink / raw)
To: linux-perf-users@vger.kernel.org
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: What is the exact meaning of this parameter ?
2015-05-27 16:55 What is the exact meaning of this parameter ? Manuel Selva
@ 2015-06-06 7:20 ` Manuel Selva
0 siblings, 0 replies; 2+ messages in thread
From: Manuel Selva @ 2015-06-06 7:20 UTC (permalink / raw)
To: linux-perf-users@vger.kernel.org
Any idea on that ?
Thanks,
----
Manu
On 05/27/2015 06:55 PM, Manuel Selva wrote:
> 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 ?
>
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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