ia64/xen-unstable
changeset 8206:5ff5117291ad
Using a slow serial console with sync_console on SMP leaves an
unusable system: it gets into a flood of
Timer ISR/0: Time went backwards: delta=-3566279 cpu_delta=16433721
shadow=2019998373 off=420435384 processed=2444000000
cpu_processed=2424000000
0: 2424000000
1: 2444000000
messages which swamps the console and leaves things almost, but not
quite, completely hung. It is a simple matter to ratelimit these
printks, which completely eliminates the problem.
unusable system: it gets into a flood of
Timer ISR/0: Time went backwards: delta=-3566279 cpu_delta=16433721
shadow=2019998373 off=420435384 processed=2444000000
cpu_processed=2424000000
0: 2424000000
1: 2444000000
messages which swamps the console and leaves things almost, but not
quite, completely hung. It is a simple matter to ratelimit these
printks, which completely eliminates the problem.
| author | kaf24@firebug.cl.cam.ac.uk |
|---|---|
| date | Sat Dec 03 10:44:01 2005 +0100 (2005-12-03) |
| parents | 5e617fd48504 |
| children | 2dcfb85f5bac |
| files | linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c |
line diff
1.1 --- a/linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c Sat Dec 03 00:51:36 2005 +0000 1.2 +++ b/linux-2.6-xen-sparse/arch/xen/i386/kernel/time.c Sat Dec 03 10:44:01 2005 +0100 1.3 @@ -560,7 +560,8 @@ irqreturn_t timer_interrupt(int irq, voi 1.4 } 1.5 while (!time_values_up_to_date(cpu)); 1.6 1.7 - if (unlikely(delta < -1000000LL) || unlikely(delta_cpu < 0)) { 1.8 + if ((unlikely(delta < -1000000LL) || unlikely(delta_cpu < 0)) 1.9 + && printk_ratelimit()) { 1.10 printk("Timer ISR/%d: Time went backwards: " 1.11 "delta=%lld cpu_delta=%lld shadow=%lld " 1.12 "off=%lld processed=%lld cpu_processed=%lld\n",