mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-14 10:09:48 +00:00
Turn PREEMPTION into a kernel option. Make sure that it's defined if
FULL_PREEMPTION is defined. Add a runtime warning to ULE if PREEMPTION is enabled (code inspired by the PREEMPTION warning in kern_switch.c). This is a possible MT5 candidate.
This commit is contained in:
parent
44af2aa001
commit
9923b511ed
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=134649
@ -113,11 +113,6 @@
|
||||
#define SSIZE 1 /* initial stack size/NBPG */
|
||||
#define SINCR 1 /* increment of stack/NBPG */
|
||||
|
||||
/* PREEMPTION exposes scheduler bugs that need to be fixed. */
|
||||
#if 0
|
||||
#define PREEMPTION
|
||||
#endif
|
||||
|
||||
#ifndef KSTACK_PAGES
|
||||
#define KSTACK_PAGES 2 /* pages of kstack (with pcb) */
|
||||
#endif
|
||||
|
@ -119,11 +119,6 @@
|
||||
#define NBPML4 (1ul<<PML4SHIFT)/* bytes/page map lev4 table */
|
||||
#define PML4MASK (NBPML4-1)
|
||||
|
||||
/* PREEMPTION exposes scheduler bugs that need to be fixed. */
|
||||
#if 0
|
||||
#define PREEMPTION
|
||||
#endif
|
||||
|
||||
#define IOPAGES 2 /* pages of i/o permission bitmap */
|
||||
|
||||
#ifndef KSTACK_PAGES
|
||||
|
@ -196,12 +196,16 @@ options MUTEX_WAKE_ALL
|
||||
|
||||
# SMP Debugging Options:
|
||||
#
|
||||
# PREEMPTION allows the threads that are in the kernel to be preempted
|
||||
# by higher priority threads. It helps with interactivity and
|
||||
# allows interrupt threads to run sooner rather than waiting.
|
||||
# WARNING! Only tested on alpha, amd64, and i386.
|
||||
# FULL_PREEMPTION instructs the kernel to preempt non-realtime kernel
|
||||
# threads. It sole use is to expose race conditions and other
|
||||
# bugs during development. Enabling this option will reduce
|
||||
# performance and increase the frequency of kernel panics by
|
||||
# design. If you aren't sure that you need it then you don't.
|
||||
# DON'T TURN THIS ON.
|
||||
# Relies on the PREEMPTION option. DON'T TURN THIS ON.
|
||||
# MUTEX_DEBUG enables various extra assertions in the mutex code.
|
||||
# SLEEPQUEUE_PROFILING enables rudimentary profiling of the hash table
|
||||
# used to hold active sleep queues.
|
||||
@ -213,6 +217,7 @@ options MUTEX_WAKE_ALL
|
||||
# a lock hierarchy violation occurs or if locks are held when going to
|
||||
# sleep.
|
||||
# WITNESS_SKIPSPIN disables the witness checks on spin mutexes.
|
||||
options PREEMPTION
|
||||
options FULL_PREEMPTION
|
||||
options MUTEX_DEBUG
|
||||
options WITNESS
|
||||
|
@ -66,7 +66,8 @@ COMPILING_LINT opt_global.h
|
||||
CONSPEED opt_comconsole.h
|
||||
CY_PCI_FASTINTR
|
||||
DIRECTIO opt_directio.h
|
||||
FULL_PREEMPTION
|
||||
FULL_PREEMPTION opt_sched.h
|
||||
PREEMPTION opt_sched.h
|
||||
GEOM_AES opt_geom.h
|
||||
GEOM_APPLE opt_geom.h
|
||||
GEOM_BDE opt_geom.h
|
||||
|
@ -97,11 +97,6 @@
|
||||
#define NBPDR (1<<PDRSHIFT) /* bytes/page dir */
|
||||
#define PDRMASK (NBPDR-1)
|
||||
|
||||
/* PREEMPTION exposes scheduler bugs that need to be fixed. */
|
||||
#if 0
|
||||
#define PREEMPTION
|
||||
#endif
|
||||
|
||||
#define IOPAGES 2 /* pages of i/o permission bitmap */
|
||||
|
||||
#ifndef KSTACK_PAGES
|
||||
|
@ -40,6 +40,7 @@ __FBSDID("$FreeBSD$");
|
||||
#include "opt_ddb.h"
|
||||
#include "opt_mprof.h"
|
||||
#include "opt_mutex_wake_all.h"
|
||||
#include "opt_sched.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
|
@ -41,6 +41,7 @@ __FBSDID("$FreeBSD$");
|
||||
#include "opt_mac.h"
|
||||
#include "opt_panic.h"
|
||||
#include "opt_show_busybufs.h"
|
||||
#include "opt_sched.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
|
@ -88,7 +88,6 @@ reassigned to keep this true.
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include "opt_full_preemption.h"
|
||||
#include "opt_sched.h"
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -109,6 +108,11 @@ __FBSDID("$FreeBSD$");
|
||||
#include <sys/sysctl.h>
|
||||
#endif
|
||||
|
||||
#ifdef FULL_PREEMPTION
|
||||
#ifndef PREEMPTION
|
||||
#error "The FULL_PREEMPTION option requires the PREEMPTION option"
|
||||
#endif
|
||||
#endif
|
||||
|
||||
CTASSERT((RQB_BPW * RQB_LEN) == RQ_NQS);
|
||||
|
||||
|
@ -27,6 +27,8 @@
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <opt_sched.h>
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kdb.h>
|
||||
@ -75,6 +77,18 @@ SYSCTL_INT(_kern_sched, OID_AUTO, slice_max, CTLFLAG_RW, &slice_max, 0, "");
|
||||
int realstathz;
|
||||
int tickincr = 1;
|
||||
|
||||
#ifdef PREEMPTION
|
||||
static void
|
||||
printf_caddr_t(void *data)
|
||||
{
|
||||
printf("%s", (char *)data);
|
||||
}
|
||||
static char preempt_warning[] =
|
||||
"WARNING: Kernel PREEMPTION is unstable under SCHED_ULE.\n";
|
||||
SYSINIT(preempt_warning, SI_SUB_COPYRIGHT, SI_ORDER_ANY, printf_caddr_t,
|
||||
preempt_warning)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* These datastructures are allocated within their parent datastructure but
|
||||
* are scheduler specific.
|
||||
|
@ -35,6 +35,8 @@
|
||||
#include <sys/cdefs.h>
|
||||
__FBSDID("$FreeBSD$");
|
||||
|
||||
#include <opt_sched.h>
|
||||
|
||||
#include <sys/param.h>
|
||||
#include <sys/systm.h>
|
||||
#include <sys/kernel.h>
|
||||
|
Loading…
Reference in New Issue
Block a user