| kvm_getpcpu.3 (235286) | kvm_getpcpu.3 (249344) |
|---|---|
| 1.\" Copyright (c) 2008 Yahoo!, Inc. 2.\" All rights reserved. 3.\" Written by: John Baldwin <jhb@FreeBSD.org> 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" | 1.\" Copyright (c) 2008 Yahoo!, Inc. 2.\" All rights reserved. 3.\" Written by: John Baldwin <jhb@FreeBSD.org> 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright --- 12 unchanged lines hidden (view full) --- 21.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27.\" SUCH DAMAGE. 28.\" |
| 29.\" $FreeBSD: head/lib/libkvm/kvm_getpcpu.3 235286 2012-05-11 20:06:46Z gjb $ | 29.\" $FreeBSD: head/lib/libkvm/kvm_getpcpu.3 249344 2013-04-10 20:26:53Z glebius $ |
| 30.\" | 30.\" |
| 31.Dd February 28, 2010 | 31.Dd April 11, 2013 |
| 32.Dt KVM_GETPCPU 3 33.Os 34.Sh NAME 35.Nm kvm_dpcpu_setcpu 36.Nm kvm_getmaxcpu , 37.Nm kvm_getpcpu 38.Nd access per-CPU data 39.Sh LIBRARY --- 4 unchanged lines hidden (view full) --- 44.In sys/sysctl.h 45.In kvm.h 46.Ft int 47.Fn kvm_dpcpu_setcpu "kvm_t *kd" "u_int cpu" 48.Ft int 49.Fn kvm_getmaxcpu "kvm_t *kd" 50.Ft void * 51.Fn kvm_getpcpu "kvm_t *kd" "int cpu" | 32.Dt KVM_GETPCPU 3 33.Os 34.Sh NAME 35.Nm kvm_dpcpu_setcpu 36.Nm kvm_getmaxcpu , 37.Nm kvm_getpcpu 38.Nd access per-CPU data 39.Sh LIBRARY --- 4 unchanged lines hidden (view full) --- 44.In sys/sysctl.h 45.In kvm.h 46.Ft int 47.Fn kvm_dpcpu_setcpu "kvm_t *kd" "u_int cpu" 48.Ft int 49.Fn kvm_getmaxcpu "kvm_t *kd" 50.Ft void * 51.Fn kvm_getpcpu "kvm_t *kd" "int cpu" |
| 52.Ft ssize_t 53.Fn kvm_read_zpcpu "kvm_t *kd" "void *buf" "u_long base" "size_t size" "int cpu" 54.Ft uint64_t 55.Fn kvm_counter_u64_fetch "kvm_t *kd" "u_long base" |
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| 52.Sh DESCRIPTION 53The 54.Fn kvm_dpcpu_setcpu , 55.Fn kvm_getmaxcpu , 56and 57.Fn kvm_getpcpu 58functions are used to access the per-CPU data of active processors in the 59kernel indicated by --- 18 unchanged lines hidden (view full) --- 78.Xr free 3 79when it is no longer needed. 80If 81.Fa cpu 82is not active, then 83.Dv NULL 84is returned instead. 85.Pp | 56.Sh DESCRIPTION 57The 58.Fn kvm_dpcpu_setcpu , 59.Fn kvm_getmaxcpu , 60and 61.Fn kvm_getpcpu 62functions are used to access the per-CPU data of active processors in the 63kernel indicated by --- 18 unchanged lines hidden (view full) --- 82.Xr free 3 83when it is no longer needed. 84If 85.Fa cpu 86is not active, then 87.Dv NULL 88is returned instead. 89.Pp |
| 90The 91.Fn kvm_read_zpcpu 92function is used to obtain private per-CPU copy from a 93.Dv UMA_ZONE_PCPU 94.Xr zone 9 . 95It takes 96.Fa base 97argument as base address of an allocation and copyies 98.Fa size 99bytes into 100.Fa buf 101from the part of allocation that is private to 102.Fa cpu . 103.Pp 104The 105.Fn kvm_counter_u64_fetch 106function fetches value of a 107.Xr counter 9 108pointed by 109.Fa base 110address. 111.Pp |
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| 86Symbols for dynamic per-CPU data are accessed via 87.Xr kvm_nlist 3 88as with other symbols. 89.Nm libkvm 90maintains a notion of the "current CPU", set by 91.Xr kvm_dpcpu_setcpu , 92which defaults to 0. 93Once another CPU is selected, --- 23 unchanged lines hidden (view full) --- 117.Dv NULL . 118If an error occurs, 119it returns -1 instead. 120.Pp 121On success, the 122.Fn kvm_dpcpu_setcpu 123call returns 0; if an error occurs, it returns -1 instead. 124.Pp | 112Symbols for dynamic per-CPU data are accessed via 113.Xr kvm_nlist 3 114as with other symbols. 115.Nm libkvm 116maintains a notion of the "current CPU", set by 117.Xr kvm_dpcpu_setcpu , 118which defaults to 0. 119Once another CPU is selected, --- 23 unchanged lines hidden (view full) --- 143.Dv NULL . 144If an error occurs, 145it returns -1 instead. 146.Pp 147On success, the 148.Fn kvm_dpcpu_setcpu 149call returns 0; if an error occurs, it returns -1 instead. 150.Pp |
| 151On success, the 152.Fn kvm_read_zpcpu 153function returns number of bytes copied. 154If an error occurs, it returns -1 instead. 155.Pp |
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| 125If any function encounters an error, 126then an error message may be retrieved via 127.Xr kvm_geterr 3 . 128.Sh SEE ALSO 129.Xr free 3 , | 156If any function encounters an error, 157then an error message may be retrieved via 158.Xr kvm_geterr 3 . 159.Sh SEE ALSO 160.Xr free 3 , |
| 130.Xr kvm 3 | 161.Xr kvm 3 , 162.Xr counter 9 , 163.Xr zone 9 |