hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

[PATCH] i386: Clean up smp_tune_scheduling() 

- remove the write-only local variable "bandwidth"
- don't set "max_cache_size" in the (cachesize < 0) case:
  that's already handled in kernel/sched.c:measure_migration_cost()

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Andi Kleen <ak@suse.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
This commit is contained in:
Adrian Bunk 2006-12-07 02:14:19 +01:00 committed by Andi Kleen
parent b65780e123
commit d9408cefe6
1 changed files with 5 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
arch/i386/kernel/smpboot.c
View File

@ -1130,33 +1130,14 @@ exit:
} }
#endif #endif
static void smp_tune_scheduling (void) static void smp_tune_scheduling(void)
{ {
unsigned long cachesize; /* kB */ 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) { if (cpu_khz) {
/*
* this basically disables processor-affinity
* scheduling on SMP without a TSC.
*/
return;
} else {
cachesize = boot_cpu_data.x86_cache_size; cachesize = boot_cpu_data.x86_cache_size;
if (cachesize == -1) {
cachesize = 16; /* Pentiums, 2x8kB cache */ if (cachesize > 0)
bandwidth = 100;
}
max_cache_size = cachesize * 1024; max_cache_size = cachesize * 1024;
} }
} }