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Add sysctl kern.sched.cpusetsize to export the size of kernel cpuset,

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also add sysconf() key _SC_CPUSET_SIZE to get sysctl value.

Submitted by: gcooper
This commit is contained in:
David Xu 2010-10-29 13:31:10 +00:00
parent 27bf126d23
commit b67cc292dc
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=214510
3 changed files with 21 additions and 0 deletions
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1
include/unistd.h
View file

@ -288,6 +288,7 @@ typedef __useconds_t useconds_t;
#if __BSD_VISIBLE
#define _SC_NPROCESSORS_CONF 57
#define _SC_NPROCESSORS_ONLN 58
#define _SC_CPUSET_SIZE 122
#endif
/* Extensions found in Solaris and Linux. */

9
lib/libc/gen/sysconf.c
View file

@ -597,6 +597,15 @@ sysconf(name)
return (lvalue);
#endif
#ifdef _SC_CPUSET_SIZE
case _SC_CPUSET_SIZE:
len = sizeof(lvalue);
if (sysctlbyname("kern.sched.cpusetsize", &lvalue, &len, NULL,
0) == -1)
return (-1);
return (lvalue);
#endif
default:
errno = EINVAL;
return (-1);

11
sys/kern/sched_ule.c
View file

@ -2712,6 +2712,8 @@ sysctl_kern_sched_topology_spec(SYSCTL_HANDLER_ARGS)
sbuf_delete(topo);
return (err);
}
static size_t _kern_cpuset_size = sizeof(cpuset_t);
#endif
SYSCTL_NODE(_kern, OID_AUTO, sched, CTLFLAG_RW, 0, "Scheduler");
@ -2748,6 +2750,15 @@ SYSCTL_INT(_kern_sched, OID_AUTO, steal_thresh, CTLFLAG_RW, &steal_thresh, 0,
SYSCTL_PROC(_kern_sched, OID_AUTO, topology_spec, CTLTYPE_STRING |
CTLFLAG_RD, NULL, 0, sysctl_kern_sched_topology_spec, "A",
"XML dump of detected CPU topology");
/*
* Return the size of cpuset_t at the kernel level
*
* XXX (gcooper): replace ULONG with SIZE once CTLTYPE_SIZE is implemented.
*/
SYSCTL_ULONG(_kern_sched, OID_AUTO, cpusetsize, CTLFLAG_RD,
&_kern_cpuset_size, 0, "Kernel-level cpuset_t struct size");
#endif
/* ps compat. All cpu percentages from ULE are weighted. */