Re: [stable] 2.6.23 regression: top displaying 9999% CPU usage

Balbir Singh
2007-10-30T06:00:27Z

Christian Borntraeger wrote:
> Am Montag, 29. Oktober 2007 schrieb Balbir Singh:
>> We'll also need this additional patch (untested), but in the long run
>> I think the approach needs to be
>>
>> 1. Update stime and utime at the time of context switching -- keep it
>> in sync with p->sum_exec_runtime
>> 2. Keep track of system/user context at system call entry points
>
> This is similar to what s390 and ppc64 do when CONFIG_VIRT_CPU_ACCOUNTING is
> set. Whenever you do a patch, please make sure to not break the already
> precise values for utime and stime on s390 and ppc. Feel free to CC me
> whenever you have a patch for this.
>

Yes, true. I'll cc everyone on this list and send out the patch as RFC.
Much of this code will be architecture specific and as you rightly
pointed out, needs to happen under !CONFIG_VIRT_CPU_ACCOUNTING

> Christian

--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL