linux-kernel - Re: [RFC] mm/page_alloc: Enumerate bad page reasons

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Message-ID: <8601ad7b-30dc-14db-48e3-2ceb1f52400f@arm.com>
Date:   Mon, 30 Mar 2020 17:58:40 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     David Hildenbrand <david@...hat.com>, linux-mm@...ck.org
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC] mm/page_alloc: Enumerate bad page reasons



On 03/30/2020 02:15 PM, David Hildenbrand wrote:
> On 30.03.20 08:51, Anshuman Khandual wrote:
>> Enumerate all existing bad page reasons which can be used in bad_page() for
>> reporting via __dump_page(). Unfortunately __dump_page() cannot be changed.
>> __dump_page() is called from dump_page() that accepts a raw string and is
>> also an exported symbol that is currently being used from various generic
>> memory functions and other drivers. This reduces code duplication while
>> reporting bad pages.
> 
> Yeah sounds nice, but "56 insertions(+), 20 deletions(-)" does not sound
> so nice ... and the "code duplication" is actually "repeating strings".

But repeating strings in very similar functions dealing with bad page state
is not bit suboptimal ?

> 
> ... I don't think we want/need this.
>