diff options
author | Ralf Baechle <ralf@linux-mips.org> | 2007-02-21 00:10:19 (GMT) |
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committer | Ralf Baechle <ralf@linux-mips.org> | 2007-02-22 00:50:45 (GMT) |
commit | de7fa296b60c9086fa038350404975b7ee4e60c2 (patch) | |
tree | 8e8aed9a18cafd1f07853076fab2fead0f29e958 /arch/mips/kernel/smp.c | |
parent | 9693a85378b590cc7a4aa2db2174422585c7c8c4 (diff) | |
download | linux-de7fa296b60c9086fa038350404975b7ee4e60c2.tar.xz |
[MIPS] SMP: Get smp_tune_scheduling to do something useful.
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/smp.c')
-rw-r--r-- | arch/mips/kernel/smp.c | 25 |
1 files changed, 4 insertions, 21 deletions
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c index 0555fc5..c46e479 100644 --- a/arch/mips/kernel/smp.c +++ b/arch/mips/kernel/smp.c @@ -51,31 +51,14 @@ int __cpu_logical_map[NR_CPUS]; /* Map logical to physical */ EXPORT_SYMBOL(phys_cpu_present_map); EXPORT_SYMBOL(cpu_online_map); +/* This happens early in bootup, can't really do it better */ static void smp_tune_scheduling (void) { struct cache_desc *cd = ¤t_cpu_data.scache; - unsigned long cachesize; /* kB */ - unsigned long cpu_khz; + unsigned long cachesize = cd->linesz * cd->sets * cd->ways; - /* - * 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; + if (cachesize > max_cache_size) + max_cache_size = cachesize; } extern void __init calibrate_delay(void); |