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Message-ID: <55704A7E.5030507@huawei.com>
Date: Thu, 4 Jun 2015 20:54:22 +0800
From: Xishi Qiu <qiuxishi@...wei.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
<nao.horiguchi@...il.com>, Yinghai Lu <yinghai@...nel.org>,
"H. Peter Anvin" <hpa@...or.com>,
"Thomas Gleixner" <tglx@...utronix.de>, <mingo@...e.hu>,
Xiexiuqi <xiexiuqi@...wei.com>,
Hanjun Guo <guohanjun@...wei.com>,
"Luck, Tony" <tony.luck@...el.com>
CC: Xishi Qiu <qiuxishi@...wei.com>, Linux MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [RFC PATCH 00/12] mm: mirrored memory support for page buddy allocations
Intel Xeon processor E7 v3 product family-based platforms introduces support
for partial memory mirroring called as 'Address Range Mirroring'. This feature
allows BIOS to specify a subset of total available memory to be mirrored (and
optionally also specify whether to mirror the range 0-4 GB). This capability
allows user to make an appropriate tradeoff between non-mirrored memory range
and mirrored memory range thus optimizing total available memory and still
achieving highly reliable memory range for mission critical workloads and/or
kernel space.
Tony has already send a patchset to supprot this feature at boot time.
https://lkml.org/lkml/2015/5/8/521
This patchset can support the feature after boot time. It introduces mirror_info
to save the mirrored memory range. Then use __GFP_MIRROR to allocate mirrored
pages.
I think add a new migratetype is btter and easier than a new zone, so I use
MIGRATE_MIRROR to manage the mirrored pages. However it changed some code in the
core file, please review and comment, thanks.
TBD:
1) call add_mirror_info() to fill mirrored memory info.
2) add compatibility with memory online/offline.
3) add more interface? others?
Xishi Qiu (12):
mm: add a new config to manage the code
mm: introduce mirror_info
mm: introduce MIGRATE_MIRROR to manage the mirrored pages
mm: add mirrored pages to buddy system
mm: introduce a new zone_stat_item NR_FREE_MIRROR_PAGES
mm: add free mirrored pages info
mm: introduce __GFP_MIRROR to allocate mirrored pages
mm: use mirrorable to switch allocate mirrored memory
mm: enable allocate mirrored memory at boot time
mm: add the buddy system interface
mm: add the PCP interface
mm: let slab/slub/slob use mirrored memory
arch/x86/mm/numa.c | 3 ++
drivers/base/node.c | 17 ++++---
fs/proc/meminfo.c | 6 +++
include/linux/gfp.h | 5 +-
include/linux/mmzone.h | 23 +++++++++
include/linux/vmstat.h | 2 +
kernel/sysctl.c | 9 ++++
mm/Kconfig | 8 +++
mm/page_alloc.c | 134 ++++++++++++++++++++++++++++++++++++++++++++++---
mm/slab.c | 3 +-
mm/slob.c | 2 +-
mm/slub.c | 2 +-
mm/vmstat.c | 4 ++
13 files changed, 202 insertions(+), 16 deletions(-)
--
2.0.0
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