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Compile in the cpu halt code even on SMP, instead just default the

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sysctl (machdep.cpu_idle_hlt) to off in the SMP case.  This allows you to
turn it on if you wish and do not particularly care about the small window
where a cpu will remain halted even when a job is placed on the run queue
(until the next clock tick).
This commit is contained in:
Peter Wemm 2002-06-24 21:31:57 +00:00
parent 1868b5c3f5
commit 417a86bac7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=98778
2 changed files with 8 additions and 4 deletions
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6
sys/amd64/amd64/machdep.c
View File

@ -780,7 +780,11 @@ cpu_halt(void)
* the !SMP case, as there is no clean way to ensure that a CPU will be
* woken when there is work available for it.
*/
#ifdef SMP
static int cpu_idle_hlt = 0;
#else
static int cpu_idle_hlt = 1;
#endif
SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
&cpu_idle_hlt, 0, "Idle loop HLT enable");
@ -793,7 +797,6 @@ SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
void
cpu_idle(void)
{
#ifndef SMP
if (cpu_idle_hlt) {
disable_intr();
if (procrunnable()) {
@ -807,7 +810,6 @@ cpu_idle(void)
__asm __volatile("sti; hlt");
}
}
#endif
}
/*

6
sys/i386/i386/machdep.c
View File

@ -780,7 +780,11 @@ cpu_halt(void)
* the !SMP case, as there is no clean way to ensure that a CPU will be
* woken when there is work available for it.
*/
#ifdef SMP
static int cpu_idle_hlt = 0;
#else
static int cpu_idle_hlt = 1;
#endif
SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
&cpu_idle_hlt, 0, "Idle loop HLT enable");
@ -793,7 +797,6 @@ SYSCTL_INT(_machdep, OID_AUTO, cpu_idle_hlt, CTLFLAG_RW,
void
cpu_idle(void)
{
#ifndef SMP
if (cpu_idle_hlt) {
disable_intr();
if (procrunnable()) {
@ -807,7 +810,6 @@ cpu_idle(void)
__asm __volatile("sti; hlt");
}
}
#endif
}
/*