linux-kernel - Re: [PATCH v3 2/7] mm/lruvec: add irqsave flags into lruvec struct

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Message-ID: <de24def3-3593-a2f7-ab73-5ac379c1e5ca@linux.alibaba.com>
Date:   Mon, 18 Nov 2019 10:52:40 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Shakeel Butt <shakeelb@...gle.com>
Cc:     Cgroups <cgroups@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux MM <linux-mm@...ck.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Tejun Heo <tj@...nel.org>, Hugh Dickins <hughd@...gle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Daniel Jordan <daniel.m.jordan@...cle.com>,
        Yang Shi <yang.shi@...ux.alibaba.com>,
        Matthew Wilcox <willy@...radead.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Michal Hocko <mhocko@...e.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Arun KS <arunks@...eaurora.org>,
        Rong Chen <rong.a.chen@...el.com>
Subject: Re: [PATCH v3 2/7] mm/lruvec: add irqsave flags into lruvec struct



在 2019/11/16 下午2:31, Shakeel Butt 写道:
> On Fri, Nov 15, 2019 at 7:15 PM Alex Shi <alex.shi@...ux.alibaba.com> wrote:
>> We need a irqflags vaiable to save state when do irqsave action, declare
>> it here would make code more clear/clean.
>>
>> Rong Chen <rong.a.chen@...el.com> reported the 'irqflags' variable need
>> move to the tail of lruvec struct otherwise it causes 18% regressions of
>> vm-scalability testing on his machine. So add the flags and lru_lock to
>> both near struct tail, even I have no clue of this perf losing.
> Regressions compared to what? Also no need to have a separate patch.
> 

Thanks for question, Shakeel, 
I will change the commit log and mention the original place: the head of lruvec struct.
As to the folding, the 3rd is already toooo long. May I leave it here to relief a littel bit burden on reading?

Thanks
Alex