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authorVenkatesh Pallipadi <venkatesh.pallipadi@intel.com>2006-01-11 22:44:18 +0100
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-11 19:04:54 -0800
commit5a07a30c3cc4dc438494d6416ffa74008a2194b3 (patch)
treeeafda8ee2f58f392f5d78af7748ce58ddb6bf9a2 /arch/i386
parent01b8faaef5d239aeabb1e712c5d9619f29e808dd (diff)
[PATCH] i386/x86-64: Remove sub jiffy profile timer support
Remove the finer control of local APIC timer. We cannot provide a sub-jiffy control like this when we use broadcast from external timer in place of local APIC. Instead of removing this only on systems that may end up using broadcast from external timer (due to C3), I am going the "I'm feeling lucky" way to remove this fully. Basically, I am not sure about usefulness of this code today. Few other architectures also don't seem to support this today. If you are using profiling and fine grained control and don't like this going away in normal case, yell at me right now. Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> Signed-off-by: Andi Kleen <ak@suse.de> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386')
-rw-r--r--arch/i386/kernel/apic.c61
1 files changed, 6 insertions, 55 deletions
diff --git a/arch/i386/kernel/apic.c b/arch/i386/kernel/apic.c
index d8f94e78de8..2d8c6ce1ecd 100644
--- a/arch/i386/kernel/apic.c
+++ b/arch/i386/kernel/apic.c
@@ -92,10 +92,6 @@ void __init apic_intr_init(void)
/* Using APIC to generate smp_local_timer_interrupt? */
int using_apic_timer = 0;
-static DEFINE_PER_CPU(int, prof_multiplier) = 1;
-static DEFINE_PER_CPU(int, prof_old_multiplier) = 1;
-static DEFINE_PER_CPU(int, prof_counter) = 1;
-
static int enabled_via_apicbase;
void enable_NMI_through_LVT0 (void * dummy)
@@ -1092,34 +1088,6 @@ void enable_APIC_timer(void)
}
}
-/*
- * the frequency of the profiling timer can be changed
- * by writing a multiplier value into /proc/profile.
- */
-int setup_profiling_timer(unsigned int multiplier)
-{
- int i;
-
- /*
- * Sanity check. [at least 500 APIC cycles should be
- * between APIC interrupts as a rule of thumb, to avoid
- * irqs flooding us]
- */
- if ( (!multiplier) || (calibration_result/multiplier < 500))
- return -EINVAL;
-
- /*
- * Set the new multiplier for each CPU. CPUs don't start using the
- * new values until the next timer interrupt in which they do process
- * accounting. At that time they also adjust their APIC timers
- * accordingly.
- */
- for (i = 0; i < NR_CPUS; ++i)
- per_cpu(prof_multiplier, i) = multiplier;
-
- return 0;
-}
-
#undef APIC_DIVISOR
/*
@@ -1134,32 +1102,10 @@ int setup_profiling_timer(unsigned int multiplier)
inline void smp_local_timer_interrupt(struct pt_regs * regs)
{
- int cpu = smp_processor_id();
-
profile_tick(CPU_PROFILING, regs);
- if (--per_cpu(prof_counter, cpu) <= 0) {
- /*
- * The multiplier may have changed since the last time we got
- * to this point as a result of the user writing to
- * /proc/profile. In this case we need to adjust the APIC
- * timer accordingly.
- *
- * Interrupts are already masked off at this point.
- */
- per_cpu(prof_counter, cpu) = per_cpu(prof_multiplier, cpu);
- if (per_cpu(prof_counter, cpu) !=
- per_cpu(prof_old_multiplier, cpu)) {
- __setup_APIC_LVTT(
- calibration_result/
- per_cpu(prof_counter, cpu));
- per_cpu(prof_old_multiplier, cpu) =
- per_cpu(prof_counter, cpu);
- }
-
#ifdef CONFIG_SMP
- update_process_times(user_mode_vm(regs));
+ update_process_times(user_mode_vm(regs));
#endif
- }
/*
* We take the 'long' return path, and there every subsystem
@@ -1206,6 +1152,11 @@ fastcall void smp_apic_timer_interrupt(struct pt_regs *regs)
irq_exit();
}
+int setup_profiling_timer(unsigned int multiplier)
+{
+ return -EINVAL;
+}
+
/*
* This interrupt should _never_ happen with our APIC/SMP architecture
*/