| Date | Mon, 30 Jan 2017 15:32:24 +0100 | From | Stanislaw Gruszka <> | Subject | Re: [GIT PULL] cputime: Convert core use of cputime_t to nsecs |
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On Mon, Jan 30, 2017 at 05:46:43AM +0100, Frederic Weisbecker wrote: > Now lets admit one drawback: s390 and powerpc with > CONFIG_VIRT_CPU_ACCOUNTING_NATIVE have new cputime_t to nsecs conversion > on cputime accounting path. But this should be leveraged by the recent > changes which delay the cputime accounting to tick and context switch.
I think it would be worth to mention that there are other drawbacks on 32bit architectures that use cputime-jiffies currently, like: - cache utilization will be worse - conversion cputime_to_jiffies() and cputime_to_clock_t() (with HZ == USER_HS) will no longer be an no-op - to keep values consistent will need to add protection of u64 store/load, which will create additional performance costs
Stanislaw
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