linux-kernel - [PATCH 0/3] Recalculate per-cpu page allocator batch and high limits after deferred meminit v2

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Message-Id: <20191021094808.28824-1-mgorman@techsingularity.net>
Date:   Mon, 21 Oct 2019 10:48:05 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Michal Hocko <mhocko@...e.com>, Vlastimil Babka <vbabka@...e.cz>,
        Thomas Gleixner <tglx@...utronix.de>,
        Matt Fleming <matt@...eblueprint.co.uk>,
        Borislav Petkov <bp@...en8.de>, Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 0/3] Recalculate per-cpu page allocator batch and high limits after deferred meminit v2

This is an updated series that addresses some review feedback and an
LKP warning.  I did not preserve Michal Hocko's ack for the fix as it
has changed.  This series replaces the following patches in mmotm

mm-pcp-share-common-code-between-memory-hotplug-and-percpu-sysctl-handler.patch
mm-meminit-recalculate-pcpu-batch-and-high-limits-after-init-completes.patch
mm-pcpu-make-zone-pcp-updates-and-reset-internal-to-the-mm.patch

Changelog since V1
o Fix a "might sleep" warning
o Reorder for easier backporting

A private report stated that system CPU usage was excessive on an AMD
EPYC 2 machine while building kernels with much longer build times than
expected. The issue is partially explained by high zone lock contention
due to the per-cpu page allocator batch and high limits being calculated
incorrectly. This series addresses a large chunk of the problem. Patch
1 is the real fix and the other two are cosmetic issues noticed while
implementing the fix.

 include/linux/mm.h |  3 ---
 mm/internal.h      |  3 +++
 mm/page_alloc.c    | 31 ++++++++++++++++++++-----------
 3 files changed, 23 insertions(+), 14 deletions(-)

-- 
2.16.4