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perf_counter: provide an mlock threshold

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Provide a threshold to relax the mlock accounting, increasing usability.

Each counter gets perf_counter_mlock_kb for free.

[ Impact: allow more mmap buffering ]

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090505155437.112113632@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
2009-05-05 17:50:24 +02:00
committed by Ingo Molnar
parent 6de6a7b957
commit c5078f78b4
3 changed files with 21 additions and 4 deletions
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8
kernel/sysctl.c
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@ -920,6 +920,14 @@ static struct ctl_table kern_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec,
},
{
.ctl_name = CTL_UNNUMBERED,
.procname = "perf_counter_mlock_kb",
.data = &sysctl_perf_counter_mlock,
.maxlen = sizeof(sysctl_perf_counter_mlock),
.mode = 0644,
.proc_handler = &proc_dointvec,
},
#endif
/*
* NOTE: do not add new entries to this table unless you have read