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Re: [Xen-devel] [PATCH] perfc: Print a system time in a convenient format
- To: Jan Beulich <JBeulich@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- From: George Dunlap <george.dunlap@xxxxxxxxxx>
- Date: Tue, 11 Sep 2018 10:28:37 +0100
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, "andrii_anisov@xxxxxxxx" <andrii_anisov@xxxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>, andrii.anisov@xxxxxxxxx, Julien Grall <julien.grall@xxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Wei Liu <wei.liu2@xxxxxxxxxx>
- Delivery-date: Tue, 11 Sep 2018 09:28:45 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Openpgp: preference=signencrypt
On 09/11/2018 10:18 AM, Jan Beulich wrote:
>>>> On 11.09.18 at 11:15, <andrew.cooper3@xxxxxxxxxx> wrote:
>> On 11/09/18 10:10, Jan Beulich wrote:
>>>>>> On 11.09.18 at 10:50, <andrii_anisov@xxxxxxxx> wrote:
>>>> On 11.09.18 11:27, Jan Beulich wrote:
>>>>> NAK, for two reasons: I'm not of the opinion that reading a 15 or more
>>>>> digit decimal number without any separators is any easier than the
>>>>> current format.
>>>> It's quite subjective. IMHO timestamps measured in ns easier to
>>>> understand in decimals rather than in separated 32-bit hex-es. No matter
>>>> how many digital number they have.
>>> It is subjective, yes, but in such a case you even more so need to
>>> demonstrate a change is an overall improvement.
>>>
>>>> Even post processing of perfc output is easier in case of decimal
>>>> timestamps. You should not parse hexes and odd separators to calculate
>>>> the time elapsed between two samples.
>>> Post processing usually uses scrips for parsing - I don't think it's
>>> overly complicated to have a script convert the number into
>>> basically any format you want.
>>
>> Right, but this particular mis-pattern wants fixing. It is simply
>> confusing to have a single number formatted with a colon inbetween.
>
> What other separator do you suggest? I consider it quite helpful
> to have one when there are more than about 10 digits. (I'd also
> be fine, btw, to have the time printed in decimal, but then
> perhaps with ms granularity and 6 digits for the fractional part.)
* We clearly already have a standard way of printing stime
* The places where a colon is used are non-standard, and thus wrong
* His patch makes an improvement by fixing the non-standard timestamp
printing.
If you're not happy with the current PRI_stime, then it should be on you
to propose and code up a change, not Andrii (unless he feels
particularly motivated to do so).
-George
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