1 .\" Copyright (c) 2007-2008 Joseph Koshy. All rights reserved.
3 .\" Redistribution and use in source and binary forms, with or without
4 .\" modification, are permitted provided that the following conditions
6 .\" 1. Redistributions of source code must retain the above copyright
7 .\" notice, this list of conditions and the following disclaimer.
8 .\" 2. Redistributions in binary form must reproduce the above copyright
9 .\" notice, this list of conditions and the following disclaimer in the
10 .\" documentation and/or other materials provided with the distribution.
12 .\" This software is provided by Joseph Koshy ``as is'' and
13 .\" any express or implied warranties, including, but not limited to, the
14 .\" implied warranties of merchantability and fitness for a particular purpose
15 .\" are disclaimed. in no event shall Joseph Koshy be liable
16 .\" for any direct, indirect, incidental, special, exemplary, or consequential
17 .\" damages (including, but not limited to, procurement of substitute goods
18 .\" or services; loss of use, data, or profits; or business interruption)
19 .\" however caused and on any theory of liability, whether in contract, strict
20 .\" liability, or tort (including negligence or otherwise) arising in any way
21 .\" out of the use of this software, even if advised of the possibility of
26 .Dd September 22, 2008
32 .Nd administrative control of hardware performance counters
38 .Fn pmc_disable "int cpu" "int pmc"
40 .Fn pmc_enable "int cpu" "int pmc"
42 These functions allow specific hardware performance monitoring
43 counters in a system to be disabled and enabled administratively.
44 The hardware performance counters available on each CPU are numbered
45 using small non-negative integers, in a system dependent manner.
46 Disabled counters will not be available to applications for use.
48 The invoking process needs to have the
50 privilege to perform these operations.
54 disables the hardware counter numbered by argument
61 enables the hardware counter numbered by argument
65 .Sh IMPLEMENTATION NOTES
66 Hardware PMCs that are currently in use by applications cannot be
68 Allocation of a process scope software PMC marks all
69 hardware PMCs in the system with the same pmc number as being in-use.
73 A call to these functions may fail with the following errors:
78 specified a hardware PMC is currently in use.
88 specified a disabled or absent CPU.
90 The current process lacks sufficient privilege to perform this