linux-kernel - Re: [PATCH] of: cache phandle nodes to decrease cost of of_find_node_by

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Date:   Mon, 5 Feb 2018 17:53:06 +0530
From:   Chintan Pandya <cpandya@...eaurora.org>
To:     Frank Rowand <frowand.list@...il.com>,
        Rob Herring <robh+dt@...nel.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] of: cache phandle nodes to decrease cost of
 of_find_node_by_phandle()


> 
> My question was trying to determine whether the numbers reported above
> are for a debug configuration or a production configuration.
My reported numbers are from debug configuration.

> not a production configuration, I was requesting the numbers for a
> production configuration.
I'm working on it. But please expect some delay in my response for this. 
As I mentioned earlier, I need to work with few teams to get these numbers.


> show a significant boot time reduction from the patch then there is
> less justification for adding complexity to the existing code.  I
> prefer to use simpler data structures and algorithms __if__ extra
> complexity does not provide any advantage.  The balance between
> complexity and benefits is a core software engineering issue.
> 
Ok
> 
>> I don't have a set up for taking these numbers in perf mode. For
>> that, I need to ask some other team and round trip follow ups. In my
>> set up, I rely on serial console logging which gets disabled in perf
>> mode.
>>
>>>
>>> Thanks,
>>>
>>> Frank
>>>
>>
>> Chintan
> 

Chintan
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