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perf_counter: More paranoia settings

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Rename the perf_counter_priv knob to perf_counter_paranoia (because
priv can be read as private, as opposed to privileged) and provide
one more level:

 0 - permissive
 1 - restrict cpu counters to privilidged contexts
 2 - restrict kernel-mode code counting and profiling

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-06-11 11:18:36 +02:00 • committed by Ingo Molnar
parent 106b506c3a
commit 0764771dab
3 changed files with 27 additions and 6 deletions
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6
kernel/sysctl.c
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@ -916,9 +916,9 @@ static struct ctl_table kern_table[] = {
#ifdef CONFIG_PERF_COUNTERS
{
.ctl_name = CTL_UNNUMBERED,
.procname = "perf_counter_privileged",
.data = &sysctl_perf_counter_priv,
.maxlen = sizeof(sysctl_perf_counter_priv),
.procname = "perf_counter_paranoid",
.data = &sysctl_perf_counter_paranoid,
.maxlen = sizeof(sysctl_perf_counter_paranoid),
.mode = 0644,
.proc_handler = &proc_dointvec,
},