linux-kernel - Re: [PATCH 2/6] mm, tree wide: replace __GFP_REPEAT by __GFP_RETRY

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Date:   Mon, 26 Jun 2017 14:17:30 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, NeilBrown <neilb@...e.com>,
        LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/6] mm, tree wide: replace __GFP_REPEAT by
 __GFP_RETRY_MAYFAIL with more useful semantic

On 06/26/2017 02:14 PM, Michal Hocko wrote:
> On Mon 26-06-17 13:45:19, Vlastimil Babka wrote:
>> On 06/23/2017 10:53 AM, Michal Hocko wrote:
> [...]
>>> - GFP_KERNEL - both background and direct reclaim are allowed and the
>>>   _default_ page allocator behavior is used. That means that !costly
>>>   allocation requests are basically nofail (unless the requesting task
>>>   is killed by the OOM killer)
>>
>> Should we explicitly point out that failure must be handled? After lots
>> of talking about "too small to fail", people might get the wrong impression.
> 
> OK. What about the following.
> "That means that !costly allocation requests are basically nofail but
> there is no guarantee of thaat behavior so failures have to be checked

                           that

> properly by callers (e.g. OOM killer victim is allowed to fail
> currently).

Looks good, thanks!