linux-kernel - Re: [PATCH 5/6] mm: honor PF_MEMALLOC

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Date:   Thu, 3 Dec 2020 08:51:08 -0800
From:   John Hubbard <jhubbard@...dia.com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
CC:     LKML <linux-kernel@...r.kernel.org>, linux-mm <linux-mm@...ck.org>,
        "Andrew Morton" <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        "Michal Hocko" <mhocko@...e.com>,
        David Hildenbrand <david@...hat.com>,
        Oscar Salvador <osalvador@...e.de>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>,
        Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        <mike.kravetz@...cle.com>, Steven Rostedt <rostedt@...dmis.org>,
        Ingo Molnar <mingo@...hat.com>, Jason Gunthorpe <jgg@...pe.ca>,
        Peter Zijlstra <peterz@...radead.org>,
        Mel Gorman <mgorman@...e.de>,
        Matthew Wilcox <willy@...radead.org>,
        David Rientjes <rientjes@...gle.com>
Subject: Re: [PATCH 5/6] mm: honor PF_MEMALLOC_NOMOVABLE for all allocations

On 12/3/20 7:06 AM, Pavel Tatashin wrote:
...
>>> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
>>> index 611799c72da5..7a6d86d0bc5f 100644
>>> --- a/mm/page_alloc.c
>>> +++ b/mm/page_alloc.c
>>> @@ -3766,20 +3766,25 @@ alloc_flags_nofragment(struct zone *zone, gfp_t gfp_mask)
>>>        return alloc_flags;
>>>    }
>>>
>>> -static inline unsigned int current_alloc_flags(gfp_t gfp_mask,
>>> -                                     unsigned int alloc_flags)
>>> +static inline unsigned int cma_alloc_flags(gfp_t gfp_mask,
>>> +                                        unsigned int alloc_flags)
>>
>> Actually, maybe the original name should be left intact. This handles current alloc
>> flags, which right now happen to only cover CMA flags, so the original name seems
>> accurate, right?
> 
> The reason I re-named it is because we do not access current context
> anymore, only use gfp_mask to get cma flag.
>>> -     unsigned int pflags = current->flags;
> 
> So, keeping "current" in the function name makes its intent misleading.
> 

OK, I see. That sounds OK then.


thanks,
-- 
John Hubbard
NVIDIA