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

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Date:   Wed, 26 Sep 2018 16:28:20 -0700
From:   Alexander Duyck <alexander.h.duyck@...ux.intel.com>
To:     sparclinux@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     pavel.tatashin@...rosoft.com, mhocko@...e.com,
        dave.jiang@...el.com, alexander.h.duyck@...ux.intel.com,
        dan.j.williams@...el.com, willy@...radead.org, mingo@...nel.org,
        khalid.aziz@...cle.com, rppt@...ux.vnet.ibm.com, vbabka@...e.cz,
        akpm@...ux-foundation.org, ldufour@...ux.vnet.ibm.com,
        davem@...emloft.net, kirill.shutemov@...ux.intel.com
Subject: [RFC mm PATCH 0/5] mm: Deferred page init improvements

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

In my testing I have seen a 3:1 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 initialization are just code clean-up to allow for reuse. I had
been considering using a large memset for the entire pageblock I was
initializing which showed a significant speedup for persistent memory init
however that showed no improvements to a slight regression for regular
deferred initialization of standard memory.

---

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(-)

--