From: Vlastimil Babka <vbabka@suse.cz>
To: Mike Kravetz <mike.kravetz@oracle.com>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Cc: Hillf Danton <hdanton@sina.com>, Michal Hocko <mhocko@kernel.org>,
Mel Gorman <mgorman@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 2/3] mm, compaction: use MIN_COMPACT_COSTLY_PRIORITY everywhere for costly orders
Date: Fri, 2 Aug 2019 12:20:33 +0200 [thread overview]
Message-ID: <a0f01341-a5d8-d015-c37e-4932eaafd868@suse.cz> (raw)
In-Reply-To: <2f1d6779-2b87-4699-abf7-0aa59a2e74d9@oracle.com>
On 8/1/19 10:33 PM, Mike Kravetz wrote:
> On 8/1/19 6:01 AM, Vlastimil Babka wrote:
>> Could you try testing the patch below instead? It should hopefully
>> eliminate the stalls. If it makes hugepage allocation give up too early,
>> we'll know we have to involve __GFP_RETRY_MAYFAIL in allowing the
>> MIN_COMPACT_PRIORITY priority. Thanks!
>
> Thanks. This patch does eliminate the stalls I was seeing.
Great, thanks! I'll send a proper patch then.
> In my testing, there is little difference in how many hugetlb pages are
> allocated. It does not appear to be giving up/failing too early. But,
> this is only with __GFP_RETRY_MAYFAIL. The real concern would with THP
> requests. Any suggestions on how to test that?
AFAICS the default THP defrag mode is unaffected, as GFP_TRANSHUGE_LIGHT doesn't
include __GFP_DIRECT_RECLAIM, so it never reaches this code. Madvised THP
allocations will be affected, which should best be tested the same way as Andrea
and Mel did in the __GFP_THISNODE debate.
next prev parent reply other threads:[~2019-08-02 10:20 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-24 17:50 [RFC PATCH 0/3] fix hugetlb page allocation stalls Mike Kravetz
2019-07-24 17:50 ` [RFC PATCH 1/3] mm, reclaim: make should_continue_reclaim perform dryrun detection Mike Kravetz
2019-07-25 8:05 ` Mel Gorman
2019-07-26 8:12 ` Mel Gorman
2019-07-31 11:08 ` Vlastimil Babka
2019-07-31 12:25 ` Mel Gorman
2019-07-31 21:11 ` Mike Kravetz
2019-08-01 8:44 ` Vlastimil Babka
2019-07-24 17:50 ` [RFC PATCH 2/3] mm, compaction: use MIN_COMPACT_COSTLY_PRIORITY everywhere for costly orders Mike Kravetz
2019-07-25 8:06 ` Mel Gorman
2019-07-31 12:06 ` Vlastimil Babka
2019-07-31 20:30 ` Mike Kravetz
2019-08-01 13:01 ` Vlastimil Babka
2019-08-01 20:33 ` Mike Kravetz
2019-08-02 10:20 ` Vlastimil Babka [this message]
2019-08-02 12:05 ` Vlastimil Babka
2019-08-02 17:44 ` Mike Kravetz
2019-07-24 17:50 ` [RFC PATCH 3/3] hugetlbfs: don't retry when pool page allocations start to fail Mike Kravetz
2019-07-25 8:13 ` Mel Gorman
2019-07-25 17:15 ` Mike Kravetz
2019-07-25 22:43 ` Mel Gorman
2019-07-31 13:23 ` Vlastimil Babka
2019-07-31 21:13 ` Mike Kravetz
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