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diff --git a/sys/dev/acpica/Osd/OsdSchedule.c b/sys/dev/acpica/Osd/OsdSchedule.c
--- a/sys/dev/acpica/Osd/OsdSchedule.c
+++ b/sys/dev/acpica/Osd/OsdSchedule.c
@@ -57,9 +57,14 @@
/*
* Track and report the system's demand for task slots.
*/
-static int acpi_tasks_hiwater;
+static int acpi_boot_tasks_nb;
+SYSCTL_INT(_debug_acpi, OID_AUTO, boot_tasks_nb, CTLFLAG_RD,
+ &acpi_boot_tasks_nb, 0,
+ "Amount of ACPI event tasks queued at boot before processing starts.");
+static int acpi_tasks_high_water;
SYSCTL_INT(_debug_acpi, OID_AUTO, tasks_hiwater, CTLFLAG_RD,
- &acpi_tasks_hiwater, 1, "Peak demand for ACPI event task slots.");
+ &acpi_tasks_high_water, 0,
+ "Peak demand for ACPI event task slots (after boot).");
/*
* Allow the user to tune the number of task threads we start. It seems
@@ -155,9 +160,11 @@
acpi_task_enqueue(int priority, ACPI_OSD_EXEC_CALLBACK Function, void *Context)
{
struct acpi_task_ctx *at;
- int hiwater, i;
+ int *high_water_p;
+ int high_water, i;
- for (at = NULL, i = 0; i < acpi_max_tasks; i++)
+ at = NULL;
+ for (i = 0; i < acpi_max_tasks; i++)
if (atomic_cmpset_int(&acpi_tasks[i].at_flag, ACPI_TASK_FREE,
ACPI_TASK_USED)) {
at = &acpi_tasks[i];
@@ -165,8 +172,11 @@
break;
}
- while (hiwater = atomic_load_int(&acpi_tasks_hiwater), i + 1 > hiwater) {
- if (atomic_cmpset_int(&acpi_tasks_hiwater, hiwater, i + 1))
+ /* Update the appropriate high water mark. */
+ high_water_p = acpi_taskq_started ? &acpi_tasks_high_water :
+ &acpi_boot_tasks_nb;
+ while (high_water = atomic_load_int(high_water_p), i + 1 > high_water) {
+ if (atomic_cmpset_int(high_water_p, high_water, i + 1))
break;
cpu_spinwait();
}

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