linux-kernel - Re: [PATCH v4 9/9] mm/lru: revise the comments of lru

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Date:   Wed, 20 Nov 2019 19:48:57 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Johannes Weiner <hannes@...xchg.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, willy@...radead.org,
        shakeelb@...gle.com, Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Ira Weiny <ira.weiny@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Jann Horn <jannh@...gle.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Souptick Joarder <jrdr.linux@...il.com>,
        Ralph Campbell <rcampbell@...dia.com>,
        "Tobin C. Harding" <tobin@...nel.org>,
        Michal Hocko <mhocko@...e.com>,
        Oscar Salvador <osalvador@...e.de>,
        Wei Yang <richard.weiyang@...il.com>,
        Arun KS <arunks@...eaurora.org>,
        "Darrick J. Wong" <darrick.wong@...cle.com>,
        Amir Goldstein <amir73il@...il.com>,
        Dave Chinner <dchinner@...hat.com>,
        Josef Bacik <josef@...icpanda.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Kirill Tkhai <ktkhai@...tuozzo.com>,
        Yafang Shao <laoar.shao@...il.com>
Subject: Re: [PATCH v4 9/9] mm/lru: revise the comments of lru_lock



在 2019/11/20 上午12:19, Johannes Weiner 写道:
> On Tue, Nov 19, 2019 at 08:23:23PM +0800, Alex Shi wrote:
>> Since we changed the pgdat->lru_lock to lruvec->lru_lock, it's time to
>> fix the incorrect comments in code. Also fixed some zone->lru_lock comment
>> error from ancient time. etc.
>>
>> Originally-from: Hugh Dickins <hughd@...gle.com>
> 
> You can resubmit a patch written by somebody else, but you need to
> preserve authorship such that git can attribute it properly:
> 
> 	From: Hugh Dickins <hughd@...gle.com>
> 
> in the patch header, as well as
> 
> 	Signed-off-by: Hugh Dickins <hughd@...gle.com>
> 
> in the changelog tags. It should look something like this:
> 
> ---
> From: Hugh Dickins <hughd@...gle.com>
> Subject: [PATCH] mm/memcg: update lru_lock Doc and comments
> 
> Update scattered references from "zone_lru_lock" to "lruvec->lru_lock"
> (in low-level descriptions) or "lruvec lock" (where that reads better).
> 
> In the course of doing so, update lock ordering comments in mm/rmap.c
> and mm/filemap.c and Documentation/cgroups/memory.txt - slightly, with
> no attempt to be complete (swap_lock, in particular, left out-of-date).
> Remove allusions to set_page_dirty under page_remove_rmap: gone in v3.9.
> 
> memcg_test.txt looks quite out-of-date: just give LRU a short paragraph.
> Replaced zone by node throughout unevictable-lru.txt (except for stats).
> Leave Documentation/locking/lockstat.txt untouched this time: it doesn't
> matter if that still refers to zone->lru_lock, along with other history.
> 
> I struggled to understand the comment above move_pages_to_lru() (surely
> it never calls page_referenced()), and eventually realized that most of
> it had got separated from shrink_active_list(): move that comment back.
> 
> Signed-off-by: Hugh Dickins <hughd@...gle.com>
> Signed-off-by: Alex Shi <alex.shi@...ux.alibaba.com>
> ---
> 

Thanks for teaching!