linux-kernel - [mm PATCH 0/5] Deferred page init improvements

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Date:   Fri, 05 Oct 2018 08:11:57 -0700
From:   Alexander Duyck <alexander.h.duyck@...ux.intel.com>
To:     linux-mm@...ck.org, akpm@...ux-foundation.org
Cc:     pavel.tatashin@...rosoft.com, mhocko@...e.com,
        dave.jiang@...el.com, alexander.h.duyck@...ux.intel.com,
        linux-kernel@...r.kernel.org, willy@...radead.org,
        davem@...emloft.net, khalid.aziz@...cle.com,
        rppt@...ux.vnet.ibm.com, vbabka@...e.cz,
        sparclinux@...r.kernel.org, dan.j.williams@...el.com,
        ldufour@...ux.vnet.ibm.com, mgorman@...hsingularity.net,
        mingo@...nel.org, kirill.shutemov@...ux.intel.com
Subject: [mm PATCH 0/5] Deferred page init improvements

This patchset is essentially a refactor of the page initialization logic
that is meant to provide for better code reuse while providing a
significant improvement in deferred page initialization performance.

In my testing I have seen a 60% reduction in the time needed for deferred
memory initialization on two different x86_64 based test systems I have. In
addition this provides a very slight improvement for the hotplug memory 
initialization, although the improvement doesn't exceed 5% from what I can
tell and that is to be expected since most of the changes related to
hotplug init are mostly just code clean-up to allow for reuse.

The biggest gains of this patchset come from not having to test each pfn
multiple times to see if it is valid and if it is actually a part of the
node being initialized.

---

Alexander Duyck (5):
      mm: Use mm_zero_struct_page from SPARC on all 64b architectures
      mm: Drop meminit_pfn_in_nid as it is redundant
      mm: Use memblock/zone specific iterator for handling deferred page init
      mm: Move hot-plug specific memory init into separate functions and optimize
      mm: Use common iterator for deferred_init_pages and deferred_free_pages

 arch/sparc/include/asm/pgtable_64.h |   30 --
 include/linux/memblock.h            |   58 ++++
 include/linux/mm.h                  |   33 ++
 mm/memblock.c                       |   63 ++++
 mm/page_alloc.c                     |  555 +++++++++++++++++++++--------------
 5 files changed, 485 insertions(+), 254 deletions(-)

--