[2.6 patch] kill smp_tune_scheduling()
From: Adrian Bunk (bunk_at_stusta.de)
Date: 08/22/05
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Date: Mon, 22 Aug 2005 02:57:49 +0200 To: linux-kernel@vger.kernel.org
Since all remaining smp_tune_scheduling()'s are now empty (except for
the useless setting of function-local variables), we can completely
remove them.
Signed-off-by: Adrian Bunk <bunk@stusta.de>
---
arch/i386/kernel/smpboot.c | 31 ---------------------------
arch/i386/mach-voyager/voyager_smp.c | 4 ---
arch/m32r/kernel/smpboot.c | 8 ------
arch/mips/kernel/smp.c | 29 -------------------------
4 files changed, 72 deletions(-)
--- linux-2.6.12-rc2-mm1-full/arch/mips/kernel/smp.c.old 2005-04-05 16:53:13.000000000 +0200
+++ linux-2.6.12-rc2-mm1-full/arch/mips/kernel/smp.c 2005-04-05 16:53:35.000000000 +0200
@@ -46,34 +46,6 @@
EXPORT_SYMBOL(phys_cpu_present_map);
EXPORT_SYMBOL(cpu_online_map);
-static void smp_tune_scheduling (void)
-{
- struct cache_desc *cd = ¤t_cpu_data.scache;
- unsigned long cachesize; /* kB */
- unsigned long bandwidth = 350; /* MB/s */
- unsigned long cpu_khz;
-
- /*
- * Crude estimate until we actually meassure ...
- */
- cpu_khz = loops_per_jiffy * 2 * HZ / 1000;
-
- /*
- * Rough estimation for SMP scheduling, this is the number of
- * cycles it takes for a fully memory-limited process to flush
- * the SMP-local cache.
- *
- * (For a P5 this pretty much means we will choose another idle
- * CPU almost always at wakeup time (this is due to the small
- * L1 cache), on PIIs it's around 50-100 usecs, depending on
- * the cache size)
- */
- if (!cpu_khz)
- return;
-
- cachesize = cd->linesz * cd->sets * cd->ways;
-}
-
extern void __init calibrate_delay(void);
extern ATTRIB_NORET void cpu_idle(void);
@@ -217,7 +189,6 @@
cpu_data[0].udelay_val = loops_per_jiffy;
init_new_context(current, &init_mm);
current_thread_info()->cpu = 0;
- smp_tune_scheduling();
prom_prepare_cpus(max_cpus);
}
--- linux-2.6.12-rc2-mm1-full/arch/i386/mach-voyager/voyager_smp.c.old 2005-04-05 16:54:07.000000000 +0200
+++ linux-2.6.12-rc2-mm1-full/arch/i386/mach-voyager/voyager_smp.c 2005-04-05 16:54:22.000000000 +0200
@@ -688,10 +688,6 @@
* schedule at the moment */
//global_irq_holder = boot_cpu_id;
- /* FIXME: Need to do something about this but currently only works
- * on CPUs with a tsc which none of mine have.
- smp_tune_scheduling();
- */
smp_store_cpu_info(boot_cpu_id);
printk("CPU%d: ", boot_cpu_id);
print_cpu_info(&cpu_data[boot_cpu_id]);
--- linux-2.6.12-rc2-mm1-full/arch/m32r/kernel/smpboot.c.old 2005-04-05 16:54:30.000000000 +0200
+++ linux-2.6.12-rc2-mm1-full/arch/m32r/kernel/smpboot.c 2005-04-05 16:54:42.000000000 +0200
@@ -109,7 +109,6 @@
void smp_prepare_boot_cpu(void);
void smp_prepare_cpus(unsigned int);
-static void smp_tune_scheduling(void);
static void init_ipi_lock(void);
static void do_boot_cpu(int);
int __cpu_up(unsigned int);
@@ -185,7 +184,6 @@
* Setup boot CPU information
*/
smp_store_cpu_info(0); /* Final full version of the data */
- smp_tune_scheduling();
/*
* If SMP should be disabled, then really disable it!
@@ -229,11 +227,6 @@
Dprintk("Boot done.\n");
}
-static void __init smp_tune_scheduling(void)
-{
- /* Nothing to do. */
-}
-
/*
* init_ipi_lock : Initialize IPI locks.
*/
-
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--- linux-2.6.13-rc6-mm1-modular/arch/i386/kernel/smpboot.c.old 2005-08-22 02:55:50.000000000 +0200
+++ linux-2.6.13-rc6-mm1-modular/arch/i386/kernel/smpboot.c 2005-08-22 02:56:08.000000000 +0200
@@ -1034,36 +1034,6 @@
}
#endif
-static void smp_tune_scheduling (void)
-{
- unsigned long cachesize; /* kB */
- unsigned long bandwidth = 350; /* MB/s */
- /*
- * Rough estimation for SMP scheduling, this is the number of
- * cycles it takes for a fully memory-limited process to flush
- * the SMP-local cache.
- *
- * (For a P5 this pretty much means we will choose another idle
- * CPU almost always at wakeup time (this is due to the small
- * L1 cache), on PIIs it's around 50-100 usecs, depending on
- * the cache size)
- */
-
- if (!cpu_khz) {
- /*
- * this basically disables processor-affinity
- * scheduling on SMP without a TSC.
- */
- return;
- } else {
- cachesize = boot_cpu_data.x86_cache_size;
- if (cachesize == -1) {
- cachesize = 16; /* Pentiums, 2x8kB cache */
- bandwidth = 100;
- }
- }
-}
-
/*
* Cycle through the processors sending APIC IPIs to boot each.
*/
@@ -1092,7 +1062,6 @@
x86_cpu_to_apicid[0] = boot_cpu_physical_apicid;
current_thread_info()->cpu = 0;
- smp_tune_scheduling();
cpus_clear(cpu_sibling_map[0]);
cpu_set(0, cpu_sibling_map[0]);
-
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