From: Michal Hocko <mhocko@kernel.org>
To: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <david@redhat.com>,
Dan Williams <dan.j.williams@intel.com>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
linux-kernel@vger.kernel.org
Subject: Re: [RFC] mm/page_alloc: Enumerate bad page reasons
Date: Mon, 30 Mar 2020 14:34:02 +0200 [thread overview]
Message-ID: <20200330123402.GI14243@dhcp22.suse.cz> (raw)
In-Reply-To: <689b594f-c18a-4131-8049-ac917345099b@arm.com>
On Mon 30-03-20 17:55:14, Anshuman Khandual wrote:
>
>
> On 03/30/2020 02:13 PM, Michal Hocko wrote:
> > On Mon 30-03-20 12:21:37, 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.
> >
> > I dunno. It sounds like over engineering something that is an internal
> > stuff. Besides that I consider string reasons kinda obvious and I am
> > pretty sure I would have to check them for each numeric alias when want
> > to read the code. Yeah, yeah, nothing really hard but still...
>
> Right these are very much self explanatory. Would moving these aliases into
> mm/page_alloc.c itself, make it any better for quicker access ?
Not really. Cscopes doesn't really care where it is. It is the fact that
the constant makes to have a look is what makes this not an improvement
from my POV.
> > So I am not really sure this is all worth the code churn. Besides
>
> I understand but is not just repeating the same strings in similar functions
> bit suboptimal as well.
I do not really see why that would be suboptimal.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2020-03-30 12:34 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-30 6:51 Anshuman Khandual
2020-03-30 8:43 ` Michal Hocko
2020-03-30 12:25 ` Anshuman Khandual
2020-03-30 12:34 ` Michal Hocko [this message]
2020-03-30 8:45 ` David Hildenbrand
2020-03-30 12:28 ` Anshuman Khandual
2020-03-30 12:38 ` David Hildenbrand
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