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Add a read-only kern.sched.preemption sysctl so that user space can tell

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if "options PREEMPTION" is compiled into the kernel.
This commit is contained in:
Robert Watson 2005-03-20 17:05:12 +00:00
parent a75ae58445
commit 6220dcba84
1 changed files with 13 additions and 0 deletions
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13
sys/kern/kern_switch.c
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@ -120,6 +120,19 @@ CTASSERT((RQB_BPW * RQB_LEN) == RQ_NQS);
#define td_kse td_sched #define td_kse td_sched
/*
* kern.sched.preemption allows user space to determine if preemption support
* is compiled in or not. It is not currently a boot or runtime flag that
* can be changed.
*/
#ifdef PREEMPTION
static int kern_sched_preemption = 1;
#else
static int kern_sched_preemption = 0;
#endif
SYSCTL_INT(_kern_sched, OID_AUTO, preemption, CTLFLAG_RD,
&kern_sched_preemption, 0, "Kernel preemption enabled");
/************************************************************************ /************************************************************************
* Functions that manipulate runnability from a thread perspective. * * Functions that manipulate runnability from a thread perspective. *
************************************************************************/ ************************************************************************/