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Subject[PATCH v3 0/4] optimize memory hotplug
Date
Changelog:
v2 - v3
Fixed two issues found during testing
Addressed Kbuild warning reports

v1 - v2
Added struct page poisoning checking in order to verify that
struct pages are never accessed until initialized during memory
hotplug

This patchset:
- Improves hotplug performance by eliminating a number of
struct page traverses during memory hotplug.

- Fixes some issues with hotplugging, where boundaries
were not properly checked. And on x86 block size was not properly aligned
with end of memory

- Also, potentially improves boot performance by eliminating condition from
__init_single_page().

- Adds robustness by verifying that that struct pages are correctly
poisoned when flags are accessed.

The following experiments were performed on Xeon(R) CPU E7-8895 v3 @ 2.60GHz
with 1T RAM:

booting in qemu with 960G of memory, time to initialize struct pages:

no-kvm:
TRY1 TRY2
BEFORE: 39.433668 39.39705
AFTER: 36.903781 36.989329

with-kvm:
BEFORE: 10.977447 11.103164
AFTER: 10.929072 10.751885

Hotplug 896G memory:
no-kvm:
TRY1 TRY2
BEFORE: 848.740000 846.910000
AFTER: 783.070000 786.560000

with-kvm:
TRY1 TRY2
BEFORE: 34.410000 33.57
AFTER: 29.810000 29.580000

Pavel Tatashin (4):
mm/memory_hotplug: enforce block size aligned range check
x86/mm/memory_hotplug: determine block size based on the end of boot
memory
mm: uninitialized struct page poisoning sanity checking
mm/memory_hotplug: optimize memory hotplug

arch/x86/mm/init_64.c | 33 +++++++++++++++++++++++++++++----
drivers/base/memory.c | 38 +++++++++++++++++++++-----------------
drivers/base/node.c | 17 ++++++++++-------
include/linux/memory_hotplug.h | 2 ++
include/linux/mm.h | 4 +++-
include/linux/node.h | 4 ++--
include/linux/page-flags.h | 22 +++++++++++++++++-----
mm/memblock.c | 2 +-
mm/memory_hotplug.c | 36 ++++++++++--------------------------
mm/page_alloc.c | 28 ++++++++++------------------
mm/sparse.c | 29 ++++++++++++++++++++++++++---
11 files changed, 131 insertions(+), 84 deletions(-)

--
2.16.1

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