Re: [patch] Real-Time Preemption, -RT-2.6.10-rc1-mm3-V0.7.25-1

[hui]

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)