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alpha: Allow HZ to be configured

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With the 1024Hz default, we spend 50% of QEMU emulation
processing timer interrupts.

Signed-off-by: Richard Henderson <rth@twiddle.net>
This commit is contained in:
Richard Henderson
2013-07-12 16:15:56 -07:00
committed by Matt Turner
parent 994dcf7055
commit fddd87d6e1
3 changed files with 59 additions and 11 deletions
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10
arch/alpha/kernel/setup.c
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@@ -1218,6 +1218,7 @@ show_cpuinfo(struct seq_file *f, void *slot)
char *systype_name;
char *sysvariation_name;
int nr_processors;
unsigned long timer_freq;
cpu_index = (unsigned) (cpu->type - 1);
cpu_name = "Unknown";
@@ -1229,6 +1230,12 @@ show_cpuinfo(struct seq_file *f, void *slot)
nr_processors = get_nr_processors(cpu, hwrpb->nr_processors);
#if CONFIG_HZ == 1024 || CONFIG_HZ == 1200
timer_freq = (100UL * hwrpb->intr_freq) / 4096;
#else
timer_freq = 100UL * CONFIG_HZ;
#endif
seq_printf(f, "cpu\t\t\t: Alpha\n"
"cpu model\t\t: %s\n"
"cpu variation\t\t: %ld\n"
@@ -1254,8 +1261,7 @@ show_cpuinfo(struct seq_file *f, void *slot)
(char*)hwrpb->ssn,
est_cycle_freq ? : hwrpb->cycle_freq,
est_cycle_freq ? "est." : "",
hwrpb->intr_freq / 4096,
(100 * hwrpb->intr_freq / 4096) % 100,
timer_freq / 100, timer_freq % 100,
hwrpb->pagesize,
hwrpb->pa_bits,
hwrpb->max_asn,