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SubjectRe: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1
From
On Thu, Nov 11, 2004 at 10:51:22PM +0100, Ingo Molnar wrote:
> i have released the -V0.7.25-1 Real-Time Preemption patch, which can be
> downloaded from the usual place:
>
> http://redhat.com/~mingo/realtime-preempt/

Patch to get rudimentary kgdb support working.

bill

diff -rwu linux.voluntary.virgin/arch/i386/Kconfig linux.voluntary/arch/i386/Kconfig
--- linux.voluntary.virgin/arch/i386/Kconfig 2004-11-11 17:05:32.000000000 -0800
+++ linux.voluntary/arch/i386/Kconfig 2004-11-11 17:11:13.000000000 -0800
@@ -509,6 +509,17 @@
default y


+config NOTE_LATENCY
+ bool "Note irq-thread wake latency"
+ depends on PREEMPT_HARDIRQS && HPET
+ default n
+ help
+ This options timestamp marks exception frame wake events to the
+ irq-thread in question and shoves it into a statistically scalable
+ histogram. Timestamp events can be "zoomed" in that are of interest
+ with compile time changes to the struct describing the ranges of
+ band(s) being saved.
+
config X86_UP_APIC
bool "Local APIC support on uniprocessors" if !SMP
depends on !(X86_VISWS || X86_VOYAGER)
diff -rwu linux.voluntary.virgin/arch/i386/Kconfig.kgdb linux.voluntary/arch/i386/Kconfig.kgdb
--- linux.voluntary.virgin/arch/i386/Kconfig.kgdb 2004-11-11 17:05:32.000000000 -0800
+++ linux.voluntary/arch/i386/Kconfig.kgdb 2004-11-11 19:44:29.000000000 -0800
@@ -1,6 +1,6 @@
config KGDB
bool "Include kgdb kernel debugger"
- depends on DEBUG_KERNEL && !KPROBES && !PREEMPT_RT
+ depends on DEBUG_KERNEL && !KPROBES
help
If you say Y here, the system will be compiled with the debug
option (-g) and a debugging stub will be included in the
diff -rwu linux.voluntary.virgin/arch/i386/kernel/kgdb_stub.c linux.voluntary/arch/i386/kernel/kgdb_stub.c
--- linux.voluntary.virgin/arch/i386/kernel/kgdb_stub.c 2004-11-11 17:05:32.000000000 -0800
+++ linux.voluntary/arch/i386/kernel/kgdb_stub.c 2004-11-11 17:11:13.000000000 -0800
@@ -365,8 +365,8 @@

#ifdef CONFIG_SMP
static int in_kgdb_called;
-static spinlock_t waitlocks[MAX_NO_CPUS] =
- {[0 ... MAX_NO_CPUS - 1] = SPIN_LOCK_UNLOCKED };
+static raw_spinlock_t waitlocks[MAX_NO_CPUS] =
+ {[0 ... MAX_NO_CPUS - 1] = RAW_SPIN_LOCK_UNLOCKED };
/*
* The following array has the thread pointer of each of the "other"
* cpus. We make it global so it can be seen by gdb.
@@ -374,9 +374,9 @@
volatile int in_kgdb_entry_log[MAX_NO_CPUS];
volatile struct pt_regs *in_kgdb_here_log[MAX_NO_CPUS];
/*
-static spinlock_t continuelocks[MAX_NO_CPUS];
+static raw_spinlock_t continuelocks[MAX_NO_CPUS];
*/
-spinlock_t kgdb_spinlock = SPIN_LOCK_UNLOCKED;
+raw_spinlock_t kgdb_spinlock = RAW_SPIN_LOCK_UNLOCKED;
/* waiters on our spinlock plus us */
static atomic_t spinlock_waiters = ATOMIC_INIT(1);
static int spinlock_count = 0;
@@ -2404,7 +2404,7 @@
void
kgdb_tstamp(int line, char *source, int data0, int data1)
{
- static spinlock_t ts_spin = SPIN_LOCK_UNLOCKED;
+ static raw_spinlock_t ts_spin = RAW_SPIN_LOCK_UNLOCKED;
int flags;
kgdb_local_irq_save(flags);
spin_lock(&ts_spin);
diff -rwu linux.voluntary.virgin/arch/i386/kernel/timers/timer_hpet.c linux.voluntary/arch/i386/kernel/timers/timer_hpet.c
--- linux.voluntary.virgin/arch/i386/kernel/timers/timer_hpet.c 2004-11-11 17:05:31.000000000 -0800
+++ linux.voluntary/arch/i386/kernel/timers/timer_hpet.c 2004-11-11 17:11:13.000000000 -0800
@@ -49,7 +49,9 @@
cyc2ns_scale = (1000 << CYC2NS_SCALE_FACTOR)/cpu_mhz;
}

-static inline unsigned long long cycles_2_ns(unsigned long long cyc)
+//static inline
+//#error
+unsigned long long cycles_2_ns(unsigned long long cyc)
{
return (cyc * cyc2ns_scale) >> CYC2NS_SCALE_FACTOR;
}
diff -rwu linux.voluntary.virgin/arch/i386/lib/kgdb_serial.c linux.voluntary/arch/i386/lib/kgdb_serial.c
--- linux.voluntary.virgin/arch/i386/lib/kgdb_serial.c 2004-11-11 17:05:32.000000000 -0800
+++ linux.voluntary/arch/i386/lib/kgdb_serial.c 2004-11-11 17:11:13.000000000 -0800
@@ -104,9 +104,9 @@
* but we will just depend on the uart status to help keep that straight.

*/
-static spinlock_t uart_interrupt_lock = SPIN_LOCK_UNLOCKED;
+static raw_spinlock_t uart_interrupt_lock = RAW_SPIN_LOCK_UNLOCKED;
#ifdef CONFIG_SMP
-extern spinlock_t kgdb_spinlock;
+extern raw_spinlock_t kgdb_spinlock;
#endif

static int
@@ -343,7 +343,7 @@
*/
int kgdb_in_isr = 0;
int kgdb_in_lsr = 0;
-extern spinlock_t kgdb_spinlock;
+extern raw_spinlock_t kgdb_spinlock;

/* Caller takes needed protections */

@@ -381,7 +381,7 @@
} /* tty_getDebugChar */

static int count = 3;
-static spinlock_t one_at_atime = SPIN_LOCK_UNLOCKED;
+static raw_spinlock_t one_at_atime = RAW_SPIN_LOCK_UNLOCKED;

static int __init
kgdb_enable_ints(void)
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