Messages in this thread | | | Date | Wed, 29 Sep 2021 13:51:23 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH v9 00/13] Don't compute events that won't be used in a metric. |
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Em Wed, Sep 29, 2021 at 09:09:24AM -0700, Ian Rogers escreveu: > On Wed, Sep 29, 2021 at 8:16 AM John Garry <john.garry@huawei.com> wrote: > > > > On 23/09/2021 08:46, Ian Rogers wrote: > > > For a metric like: > > > EVENT1 if #smt_on else EVENT2 > > > > > > currently EVENT1 and EVENT2 will be measured and then when the metric > > > is reported EVENT1 or EVENT2 will be printed depending on the value > > > from smt_on() during the expr parsing. Computing both events is > > > unnecessary and can lead to multiplexing as discussed in this thread: > > > https://lore.kernel.org/lkml/20201110100346.2527031-1-irogers@google.com/ > > > > > > This change modifies expression parsing so that constants are > > > considered when building the set of ids (events) and only events not > > > contributing to a constant value are measured. > > > > Based on some testing on my arm64 platform, no regression seen, so: > > > > Tested-by: John Garry <john.garry@huawei.com> > > Awesome, much thanks Jiri, John, Andi for the reviews and testing!
Thanks, applied.
- Arnaldo
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