linux-kernel - Re: [RFC PATCH 3/3] hugetlbfs: don't retry when pool page allocations start to fail

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Message-ID: <b7eb72a6-65a4-4785-39ec-a995d415fae3@oracle.com>
Date:   Wed, 31 Jul 2019 14:13:44 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     Vlastimil Babka <vbabka@...e.cz>, Mel Gorman <mgorman@...e.de>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Hillf Danton <hdanton@...a.com>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC PATCH 3/3] hugetlbfs: don't retry when pool page allocations
 start to fail

On 7/31/19 6:23 AM, Vlastimil Babka wrote:
> On 7/25/19 7:15 PM, Mike Kravetz wrote:
>> On 7/25/19 1:13 AM, Mel Gorman wrote:
>>> On Wed, Jul 24, 2019 at 10:50:14AM -0700, Mike Kravetz wrote:
>>>
>>> set_max_huge_pages can fail the NODEMASK_ALLOC() alloc which you handle
>>> *but* in the event of an allocation failure this bug can silently recur.
>>> An informational message might be justified in that case in case the
>>> stall should recur with no hint as to why.
>>
>> Right.
>> Perhaps a NODEMASK_ALLOC() failure should just result in a quick exit/error.
>> If we can't allocate a node mask, it is unlikely we will be able to allocate
>> a/any huge pages.  And, the system must be extremely low on memory and there
>> are likely other bigger issues.
> 
> Agreed. But I would perhaps drop __GFP_NORETRY from the mask allocation
> as that can fail for transient conditions.

Thanks, I was unsure if adding __GFP_NORETRY would be a good idea.

-- 
Mike Kravetz