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- Use the correct test in the ipi bitmask handler for IPI_PREEMPT so that

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we actually issue preemptions.
 - Remove the #ifdef IPI_PREEMPTION so it is always compiled in.  Leave
   the option which optionally enables support in sched_4bsd.  sched_ule.c
   will soon use this functionality as a run time rather than compile time
   option.
 - Compare against the idlethread rather than the priority.  There are some
   idle prio tasks that we can preempt.

Discussed with:	ups
Tested on:	i386, amd64
This commit is contained in:
Jeff Roberson 2007-01-11 00:17:02 +00:00
parent 635fd50514
commit b31e373bf7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=165929
2 changed files with 5 additions and 13 deletions
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6
sys/amd64/amd64/mp_machdep.c
View File

@ -948,11 +948,10 @@ ipi_bitmap_handler(struct trapframe frame)
ipi_bitmap = atomic_readandclear_int(&cpu_ipi_pending[cpu]);
#ifdef IPI_PREEMPTION
if (ipi_bitmap & IPI_PREEMPT) {
if (ipi_bitmap & (1 << IPI_PREEMPT)) {
mtx_lock_spin(&sched_lock);
/* Don't preempt the idle thread */
if (curthread->td_priority < PRI_MIN_IDLE) {
if (curthread != PCPU_GET(idlethread)) {
struct thread *running_thread = curthread;
if (running_thread->td_critnest > 1)
running_thread->td_owepreempt = 1;
@ -961,7 +960,6 @@ ipi_bitmap_handler(struct trapframe frame)
}
mtx_unlock_spin(&sched_lock);
}
#endif
/* Nothing to do for AST */
}

12
sys/i386/i386/mp_machdep.c
View File

@ -163,9 +163,7 @@ static void ipi_nmi_selected(u_int32_t cpus);
#ifdef COUNT_IPIS
/* Interrupt counts. */
#ifdef IPI_PREEMPTION
static u_long *ipi_preempt_counts[MAXCPU];
#endif
static u_long *ipi_ast_counts[MAXCPU];
u_long *ipi_invltlb_counts[MAXCPU];
u_long *ipi_invlrng_counts[MAXCPU];
@ -1143,14 +1141,13 @@ ipi_bitmap_handler(struct trapframe frame)
ipi_bitmap = atomic_readandclear_int(&cpu_ipi_pending[cpu]);
#ifdef IPI_PREEMPTION
if (ipi_bitmap & IPI_PREEMPT) {
if (ipi_bitmap & (1 << IPI_PREEMPT)) {
#ifdef COUNT_IPIS
*ipi_preempt_counts[cpu]++;
#endif
mtx_lock_spin(&sched_lock);
/* Don't preempt the idle thread */
if (curthread->td_priority < PRI_MIN_IDLE) {
if (curthread != PCPU_GET(idlethread)) {
struct thread *running_thread = curthread;
if (running_thread->td_critnest > 1)
running_thread->td_owepreempt = 1;
@ -1159,9 +1156,8 @@ ipi_bitmap_handler(struct trapframe frame)
}
mtx_unlock_spin(&sched_lock);
}
#endif
if (ipi_bitmap & IPI_AST) {
if (ipi_bitmap & (1 << IPI_AST)) {
#ifdef COUNT_IPIS
*ipi_ast_counts[cpu]++;
#endif
@ -1514,10 +1510,8 @@ mp_ipi_intrcnt(void *dummy)
intrcnt_add(buf, &ipi_invlrng_counts[i]);
snprintf(buf, sizeof(buf), "cpu%d: invlpg", i);
intrcnt_add(buf, &ipi_invlpg_counts[i]);
#ifdef IPI_PREEMPTION
snprintf(buf, sizeof(buf), "cpu%d: preempt", i);
intrcnt_add(buf, &ipi_preempt_counts[i]);
#endif
snprintf(buf, sizeof(buf), "cpu%d: ast", i);
intrcnt_add(buf, &ipi_ast_counts[i]);
snprintf(buf, sizeof(buf), "cpu%d: rendezvous", i);