linux-kernel - Re: [PATCH v3 3/7] mm/lru: replace pgdat lru

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Date:   Tue, 19 Nov 2019 18:14:26 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, akpm@...ux-foundation.org,
        mgorman@...hsingularity.net, tj@...nel.org, hughd@...gle.com,
        khlebnikov@...dex-team.ru, daniel.m.jordan@...cle.com,
        yang.shi@...ux.alibaba.com, Johannes Weiner <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Roman Gushchin <guro@...com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Chris Down <chris@...isdown.name>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vlastimil Babka <vbabka@...e.cz>, Qian Cai <cai@....pw>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        swkhack <swkhack@...il.com>,
        "Potyra, Stefan" <Stefan.Potyra@...ktrobit.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        Colin Ian King <colin.king@...onical.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Peng Fan <peng.fan@....com>,
        Nikolay Borisov <nborisov@...e.com>,
        Ira Weiny <ira.weiny@...el.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v3 3/7] mm/lru: replace pgdat lru_lock with lruvec lock



> 
>>>> As your concern for a 'new' caller, since __split_huge_page is a static helper here, no distub for anyothers.
>>> Even though it's static, there may be other callers within the same file.
>>> Or somebody may decide to make it non-static in the future.  I think it's
>>> actually clearer to keep the irqflags as a separate parameter.
>>>
>>
>> But it's no one else using this function now. and no one get disturb, right? It's non sense to consider a 'possibility' issue.
> 
> It is not nonsense to consider the complexity of the mm!  Your patch makes
> it harder to understand unnecessarily.  Please be considerate of the other
> programmers who must build on what you have created.
> 

I believe the 'flags' parameter are using __split_huge_page is just for irqsave/restore of lru_lock, so move it into lruvec should be reduce the parameter jumping in caller/callee.
But in another side, the flags opitimze isn't close related with lru_lock change, and better to be split out.
So thanks for your comments, I will remove this part for this patchset.

Thanks!
Alex