From: Anshuman Khandual <anshuman.khandual@arm.com>
To: linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, akpm@linux-foundation.org,
catalin.marinas@arm.com, will.deacon@arm.com
Cc: mark.rutland@arm.com, mhocko@suse.com, ira.weiny@intel.com,
david@redhat.com, robin.murphy@arm.com, cai@lca.pw,
logang@deltatee.com, james.morse@arm.com, cpandya@codeaurora.org,
arunks@codeaurora.org, dan.j.williams@intel.com,
mgorman@techsingularity.net, osalvador@suse.de
Subject: [PATCH V3 0/4] arm64/mm: Enable memory hot remove
Date: Tue, 14 May 2019 14:30:03 +0530 [thread overview]
Message-ID: <1557824407-19092-1-git-send-email-anshuman.khandual@arm.com> (raw)
This series enables memory hot remove on arm64 after fixing a memblock
removal ordering problem in generic __remove_memory() and kernel page
table race conditions on arm64. This is based on the following arm64
working tree.
git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/core
David had pointed out that the following patch is already in next/master
(58b11e136dcc14358) and will conflict with the last patch here. Will fix
the conflict once this series gets reviewed and agreed upon.
Author: David Hildenbrand <david@redhat.com>
Date: Wed Apr 10 11:02:27 2019 +1000
mm/memory_hotplug: make __remove_pages() and arch_remove_memory() never fail
All callers of arch_remove_memory() ignore errors. And we should really
try to remove any errors from the memory removal path. No more errors are
reported from __remove_pages(). BUG() in s390x code in case
arch_remove_memory() is triggered. We may implement that properly later.
WARN in case powerpc code failed to remove the section mapping, which is
better than ignoring the error completely right now.
Testing:
Tested memory hot remove on arm64 for 4K, 16K, 64K page config options with
all possible CONFIG_ARM64_VA_BITS and CONFIG_PGTABLE_LEVELS combinations. But
build tested on non arm64 platforms.
Changes in V3:
- Implemented most of the suggestions from Mark Rutland for remove_pagetable()
- Fixed applicable PGTABLE_LEVEL wrappers around pgtable page freeing functions
- Replaced 'direct' with 'sparse_vmap' in remove_pagetable() with inverted polarity
- Changed pointer names ('p' at end) and removed tmp from iterations
- Perform intermediate TLB invalidation while clearing pgtable entries
- Dropped flush_tlb_kernel_range() in remove_pagetable()
- Added flush_tlb_kernel_range() in remove_pte_table() instead
- Renamed page freeing functions for pgtable page and mapped pages
- Used page range size instead of order while freeing mapped or pgtable pages
- Removed all PageReserved() handling while freeing mapped or pgtable pages
- Replaced XXX_index() with XXX_offset() while walking the kernel page table
- Used READ_ONCE() while fetching individual pgtable entries
- Taken overall init_mm.page_table_lock instead of just while changing an entry
- Dropped previously added [pmd|pud]_index() which are not required anymore
- Added a new patch to protect kernel page table race condtion for ptdump
- Added a new patch from Mark Rutland to prevent huge-vmap with ptdump
Changes in V2: (https://lkml.org/lkml/2019/4/14/5)
- Added all received review and ack tags
- Split the series from ZONE_DEVICE enablement for better review
- Moved memblock re-order patch to the front as per Robin Murphy
- Updated commit message on memblock re-order patch per Michal Hocko
- Dropped [pmd|pud]_large() definitions
- Used existing [pmd|pud]_sect() instead of earlier [pmd|pud]_large()
- Removed __meminit and __ref tags as per Oscar Salvador
- Dropped unnecessary 'ret' init in arch_add_memory() per Robin Murphy
- Skipped calling into pgtable_page_dtor() for linear mapping page table
pages and updated all relevant functions
Changes in V1: (https://lkml.org/lkml/2019/4/3/28)
Anshuman Khandual (3):
mm/hotplug: Reorder arch_remove_memory() call in __remove_memory()
arm64/mm: Hold memory hotplug lock while walking for kernel page table dump
arm64/mm: Enable memory hot remove
Mark Rutland (1):
arm64/mm: Inhibit huge-vmap with ptdump
arch/arm64/Kconfig | 3 +
arch/arm64/mm/mmu.c | 215 ++++++++++++++++++++++++++++++++++++++++-
arch/arm64/mm/ptdump_debugfs.c | 3 +
mm/memory_hotplug.c | 3 +-
4 files changed, 217 insertions(+), 7 deletions(-)
--
2.7.4
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2019-05-14 9:00 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-14 9:00 Anshuman Khandual [this message]
2019-05-14 9:00 ` [PATCH V3 1/4] mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() Anshuman Khandual
2019-05-14 9:05 ` David Hildenbrand
2019-05-14 9:00 ` [PATCH V3 2/4] arm64/mm: Hold memory hotplug lock while walking for kernel page table dump Anshuman Khandual
2019-05-14 9:16 ` David Hildenbrand
2019-05-14 15:40 ` Mark Rutland
2019-05-15 1:56 ` Anshuman Khandual
2019-05-15 16:58 ` Michal Hocko
2019-05-16 10:23 ` Mark Rutland
2019-05-16 11:05 ` Michal Hocko
2019-05-22 16:42 ` Mark Rutland
2019-05-24 6:06 ` Anshuman Khandual
2019-05-27 7:20 ` Michal Hocko
2019-05-28 14:09 ` Mark Rutland
2019-05-16 11:06 ` Anshuman Khandual
2019-05-16 11:16 ` Michal Hocko
2019-05-23 8:40 ` David Hildenbrand
2019-05-24 5:43 ` Anshuman Khandual
2019-05-14 9:00 ` [PATCH V3 3/4] arm64/mm: Inhibit huge-vmap with ptdump Anshuman Khandual
2019-05-14 9:20 ` David Hildenbrand
2019-05-16 8:38 ` Ard Biesheuvel
2019-05-14 9:00 ` [PATCH V3 4/4] arm64/mm: Enable memory hot remove Anshuman Khandual
2019-05-14 9:08 ` David Hildenbrand
2019-05-15 11:49 ` Mark Rutland
2019-05-16 5:34 ` Anshuman Khandual
2019-05-16 10:57 ` Mark Rutland
2019-05-17 3:15 ` Anshuman Khandual
2019-05-14 9:10 ` [PATCH V3 0/4] " David Hildenbrand
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1557824407-19092-1-git-send-email-anshuman.khandual@arm.com \
--to=anshuman.khandual@arm.com \
--cc=akpm@linux-foundation.org \
--cc=arunks@codeaurora.org \
--cc=cai@lca.pw \
--cc=catalin.marinas@arm.com \
--cc=cpandya@codeaurora.org \
--cc=dan.j.williams@intel.com \
--cc=david@redhat.com \
--cc=ira.weiny@intel.com \
--cc=james.morse@arm.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=logang@deltatee.com \
--cc=mark.rutland@arm.com \
--cc=mgorman@techsingularity.net \
--cc=mhocko@suse.com \
--cc=osalvador@suse.de \
--cc=robin.murphy@arm.com \
--cc=will.deacon@arm.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).