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Add the tunable "debug.acpi.max_threads" to allow users to set the

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number of task threads to start on boot.  Go back to a default of 3
threads to work around lost battery state problems.  Users that need
a setting of 1 can set this via the tunable.  I am investigating the
underlying issues and this tunable can be removed once they are solved.

MFC after:	2 days
This commit is contained in:
Nate Lawson 2005-04-21 06:13:48 +00:00
parent d56c5d4bec
commit 98cc161947
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=145352
2 changed files with 10 additions and 4 deletions
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9
sys/dev/acpica/Osd/OsdSchedule.c
View File

@ -49,6 +49,13 @@
#define _COMPONENT ACPI_OS_SERVICES
ACPI_MODULE_NAME("SCHEDULE")
/*
* Allow the user to tune the number of task threads we start. It seems
* some systems have problems with increased parallelism.
*/
static int acpi_max_threads = ACPI_MAX_THREADS;
TUNABLE_INT("debug.acpi.max_threads", &acpi_max_threads);
/*
* This is a little complicated due to the fact that we need to build and then
* free a 'struct task' for each task we enqueue.
@ -130,7 +137,7 @@ acpi_task_thread_init(void)
err = 0;
STAILQ_INIT(&acpi_task_queue);
for (i = 0; i < ACPI_MAX_THREADS; i++) {
for (i = 0; i < acpi_max_threads; i++) {
err = kthread_create(acpi_task_thread, NULL, &acpi_kthread_proc,
0, 0, "acpi_task%d", i);
if (err != 0) {

5
sys/dev/acpica/acpivar.h
View File

@ -421,9 +421,8 @@ int acpi_PkgGas(device_t dev, ACPI_OBJECT *res, int idx, int *type,
int *rid, struct resource **dst);
ACPI_HANDLE acpi_GetReference(ACPI_HANDLE scope, ACPI_OBJECT *obj);
#ifndef ACPI_MAX_THREADS
#define ACPI_MAX_THREADS 1
#endif
/* Default number of task queue threads to start. */
#define ACPI_MAX_THREADS 3
/* ACPI task kernel thread initialization. */
int acpi_task_thread_init(void);