linux-kernel - Re: [PATCH v3] mm/page_owner: fix for deferred struct page init

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Message-ID: <bfcd017d-dcf4-b687-1aef-ab0810b12c73@lca.pw>
Date:   Mon, 7 Jan 2019 20:53:08 -0500
From:   Qian Cai <cai@....pw>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     akpm@...ux-foundation.org, Pavel.Tatashin@...rosoft.com,
        mingo@...nel.org, mgorman@...hsingularity.net,
        iamjoonsoo.kim@....com, tglx@...utronix.de, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm/page_owner: fix for deferred struct page init



On 1/7/19 1:43 PM, Michal Hocko wrote:
> On Fri 04-01-19 15:18:08, Qian Cai wrote:
> [...]
>> Though, I can't see any really benefit of this approach apart from "beautify"
> 
> This is not about beautifying! This is about making the code long term
> maintainable. As you can see it is just too easy to break it with the
> current scheme. And that is bad especially when the code is broken
> because of an optimization.
> 

Understood, but the code is now fixed. If there is something fundamentally
broken in the future, it may be a good time then to create a looks like
hundred-line cleanup patch for long-term maintenance at the same time to fix
real bugs.