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[S390] prevent unneccesary loops_per_jiffy recalculation

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When the seqfile /proc/cpuinfo gets accesses for each possible cpu
loops_per_jiffy gets recalculated. However its value is only needed
on first access.
In addition loops_per_jiffy should be recalculated when the machine
reports a capability change.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2011-01-05 12:48:18 +01:00 committed by Martin Schwidefsky
parent 19726cec63
commit 8e1023016c
2 changed files with 2 additions and 1 deletions
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2
arch/s390/kernel/processor.c
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@ -46,8 +46,8 @@ static int show_cpuinfo(struct seq_file *m, void *v)
unsigned long n = (unsigned long) v - 1;
int i;
s390_adjust_jiffies();
if (!n) {
s390_adjust_jiffies();
seq_printf(m, "vendor_id : IBM/S390\n"
"# processors : %i\n"
"bogomips per cpu: %lu.%02lu\n",

1
drivers/s390/char/sclp_config.c
View File

@ -33,6 +33,7 @@ static void sclp_cpu_capability_notify(struct work_struct *work)
int cpu;
struct sys_device *sysdev;
s390_adjust_jiffies();
pr_warning("cpu capability changed.\n");
get_online_cpus();
for_each_online_cpu(cpu) {