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