linux-kernel - [PATCH v2 0/4] address hugetlb page allocation stalls

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Date:   Mon,  5 Aug 2019 18:47:40 -0700
From:   Mike Kravetz <mike.kravetz@...cle.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org
Cc:     Hillf Danton <hdanton@...a.com>, Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...nel.org>, Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mike Kravetz <mike.kravetz@...cle.com>
Subject: [PATCH v2 0/4] address hugetlb page allocation stalls

Allocation of hugetlb pages via sysctl or procfs can stall for minutes
or hours.  A simple example on a two node system with 8GB of memory is
as follows:

echo 4096 > /sys/devices/system/node/node1/hugepages/hugepages-2048kB/nr_hugepages
echo 4096 > /proc/sys/vm/nr_hugepages

Obviously, both allocation attempts will fall short of their 8GB goal.
However, one or both of these commands may stall and not be interruptible.
The issues were initially discussed in mail thread [1] and RFC code at [2].

This series addresses the issues causing the stalls.  There are two distinct
fixes, a cleanup, and an optimization.  The reclaim patch by Hillf and
compaction patch by Vlasitmil address corner cases in their respective areas.
hugetlb page allocation could stall due to either of these issues.  Vlasitmil
added a cleanup patch after Hillf's modifications.  The hugetlb patch by
Mike is an optimization suggested during the debug and development process.

v2 changes/modifications are mentioned in each of the patches.

[1] http://lkml.kernel.org/r/d38a095e-dc39-7e82-bb76-2c9247929f07@oracle.com
[2] http://lkml.kernel.org/r/20190724175014.9935-1-mike.kravetz@oracle.com

Hillf Danton (1):
  mm, reclaim: make should_continue_reclaim perform dryrun detection

Mike Kravetz (1):
  hugetlbfs: don't retry when pool page allocations start to fail

Vlastimil Babka (2):
  mm, reclaim: cleanup should_continue_reclaim()
  mm, compaction: raise compaction priority after it withdrawns

 include/linux/compaction.h | 22 +++++++---
 mm/hugetlb.c               | 89 +++++++++++++++++++++++++++++++++-----
 mm/page_alloc.c            | 16 +++++--
 mm/vmscan.c                | 57 ++++++++++--------------
 4 files changed, 130 insertions(+), 54 deletions(-)

-- 
2.20.1