From: Pavel Tatashin <pasha.tatashin@soleen.com>
To: pasha.tatashin@soleen.com, jmorris@namei.org, sashal@kernel.org,
ebiederm@xmission.com, kexec@lists.infradead.org,
linux-kernel@vger.kernel.org, corbet@lwn.net,
catalin.marinas@arm.com, will@kernel.org,
linux-arm-kernel@lists.infradead.org, marc.zyngier@arm.com,
james.morse@arm.com, vladimir.murzin@arm.com,
matthias.bgg@gmail.com, bhsharma@redhat.com, linux-mm@kvack.org,
mark.rutland@arm.com
Subject: [PATCH v3 00/17] arm64: MMU enabled kexec relocation
Date: Wed, 21 Aug 2019 14:31:47 -0400 [thread overview]
Message-ID: <20190821183204.23576-1-pasha.tatashin@soleen.com> (raw)
Changelog:
v3:
- Split changes to create_safe_exec_page() into several patches for
easier review as request by Mark Rutland. This is why this series
has 3 more patches.
- Renamed trans_table to tans_pgd as agreed with Mark. The header
comment in trans_pgd.c explains that trans stands for
transitional page tables. Meaning they are used in transition
between two kernels.
v2:
- Fixed hibernate bug reported by James Morse
- Addressed comments from James Morse:
* More incremental changes to trans_table
* Removed TRANS_FORCEMAP
* Added kexec reboot data for image with 380M in size.
Enable MMU during kexec relocation in order to improve reboot performance.
If kexec functionality is used for a fast system update, with a minimal
downtime, the relocation of kernel + initramfs takes a significant portion
of reboot.
The reason for slow relocation is because it is done without MMU, and thus
not benefiting from D-Cache.
Performance data
----------------
For this experiment, the size of kernel plus initramfs is small, only 25M.
If initramfs was larger, than the improvements would be greater, as time
spent in relocation is proportional to the size of relocation.
Previously:
kernel shutdown 0.022131328s
relocation 0.440510736s
kernel startup 0.294706768s
Relocation was taking: 58.2% of reboot time
Now:
kernel shutdown 0.032066576s
relocation 0.022158152s
kernel startup 0.296055880s
Now: Relocation takes 6.3% of reboot time
Total reboot is x2.16 times faster.
With bigger userland (fitImage 380M), the reboot time is improved by 3.57s,
and is reduced from 3.9s down to 0.33s
Previous approaches and discussions
-----------------------------------
https://lore.kernel.org/lkml/20190817024629.26611-1-pasha.tatashin@soleen.com
version 2 of this series
https://lore.kernel.org/lkml/20190801152439.11363-1-pasha.tatashin@soleen.com
version 1 of this series
https://lore.kernel.org/lkml/20190709182014.16052-1-pasha.tatashin@soleen.com
reserve space for kexec to avoid relocation, involves changes to generic code
to optimize a problem that exists on arm64 only:
https://lore.kernel.org/lkml/20190716165641.6990-1-pasha.tatashin@soleen.com
The first attempt to enable MMU, some bugs that prevented performance
improvement. The page tables unnecessary configured idmap for the whole
physical space.
https://lore.kernel.org/lkml/20190731153857.4045-1-pasha.tatashin@soleen.com
No linear copy, bug with EL2 reboots.
Pavel Tatashin (17):
kexec: quiet down kexec reboot
arm64, hibernate: use get_safe_page directly
arm64, hibernate: remove gotos in create_safe_exec_page
arm64, hibernate: rename dst to page in create_safe_exec_page
arm64, hibernate: check pgd table allocation
arm64, hibernate: add trans_pgd public functions
arm64, hibernate: move page handling function to new trans_pgd.c
arm64, trans_pgd: make trans_pgd_map_page generic
arm64, trans_pgd: add trans_pgd_create_empty
arm64, trans_pgd: adjust trans_pgd_create_copy interface
arm64, trans_pgd: add PUD_SECT_RDONLY
arm64, trans_pgd: complete generalization of trans_pgds
kexec: add machine_kexec_post_load()
arm64, kexec: move relocation function setup and clean up
arm64, kexec: add expandable argument to relocation function
arm64, kexec: configure trans_pgd page table for kexec
arm64, kexec: enable MMU during kexec relocation
arch/arm64/Kconfig | 4 +
arch/arm64/include/asm/kexec.h | 51 ++++-
arch/arm64/include/asm/pgtable-hwdef.h | 1 +
arch/arm64/include/asm/trans_pgd.h | 63 ++++++
arch/arm64/kernel/asm-offsets.c | 14 ++
arch/arm64/kernel/cpu-reset.S | 4 +-
arch/arm64/kernel/cpu-reset.h | 8 +-
arch/arm64/kernel/hibernate.c | 261 ++++++------------------
arch/arm64/kernel/machine_kexec.c | 199 ++++++++++++++----
arch/arm64/kernel/relocate_kernel.S | 196 +++++++++---------
arch/arm64/mm/Makefile | 1 +
arch/arm64/mm/trans_pgd.c | 270 +++++++++++++++++++++++++
kernel/kexec.c | 4 +
kernel/kexec_core.c | 8 +-
kernel/kexec_file.c | 4 +
kernel/kexec_internal.h | 2 +
16 files changed, 750 insertions(+), 340 deletions(-)
create mode 100644 arch/arm64/include/asm/trans_pgd.h
create mode 100644 arch/arm64/mm/trans_pgd.c
--
2.23.0
next reply other threads:[~2019-08-21 18:32 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-21 18:31 Pavel Tatashin [this message]
2019-08-21 18:31 ` [PATCH v3 01/17] kexec: quiet down kexec reboot Pavel Tatashin
2019-09-06 15:17 ` James Morse
2019-09-06 15:35 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 02/17] arm64, hibernate: use get_safe_page directly Pavel Tatashin
2019-09-06 15:17 ` James Morse
2019-09-06 15:39 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 03/17] arm64, hibernate: remove gotos in create_safe_exec_page Pavel Tatashin
2019-09-06 15:17 ` James Morse
2019-09-06 15:41 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 04/17] arm64, hibernate: rename dst to page " Pavel Tatashin
2019-09-06 15:17 ` James Morse
2019-09-06 15:41 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 05/17] arm64, hibernate: check pgd table allocation Pavel Tatashin
2019-09-06 15:17 ` James Morse
2019-09-06 15:44 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 06/17] arm64, hibernate: add trans_pgd public functions Pavel Tatashin
2019-09-06 15:18 ` James Morse
2019-09-06 16:00 ` Pavel Tatashin
2019-10-11 18:16 ` James Morse
2019-08-21 18:31 ` [PATCH v3 07/17] arm64, hibernate: move page handling function to new trans_pgd.c Pavel Tatashin
2019-09-06 15:18 ` James Morse
2019-09-06 17:41 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 08/17] arm64, trans_pgd: make trans_pgd_map_page generic Pavel Tatashin
2019-09-06 15:20 ` James Morse
2019-09-06 18:58 ` Pavel Tatashin
2019-10-11 18:15 ` James Morse
2019-08-21 18:31 ` [PATCH v3 09/17] arm64, trans_pgd: add trans_pgd_create_empty Pavel Tatashin
2019-09-06 15:20 ` James Morse
2019-09-06 19:00 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 10/17] arm64, trans_pgd: adjust trans_pgd_create_copy interface Pavel Tatashin
2019-09-06 15:20 ` James Morse
2019-09-06 19:03 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 11/17] arm64, trans_pgd: add PUD_SECT_RDONLY Pavel Tatashin
2019-09-06 15:21 ` James Morse
2019-09-06 19:04 ` Pavel Tatashin
2019-08-21 18:31 ` [PATCH v3 12/17] arm64, trans_pgd: complete generalization of trans_pgds Pavel Tatashin
2019-09-06 15:23 ` James Morse
2019-09-06 19:06 ` Pavel Tatashin
2019-08-21 18:32 ` [PATCH v3 13/17] kexec: add machine_kexec_post_load() Pavel Tatashin
2019-08-21 18:32 ` [PATCH v3 14/17] arm64, kexec: move relocation function setup and clean up Pavel Tatashin
2019-08-21 18:32 ` [PATCH v3 15/17] arm64, kexec: add expandable argument to relocation function Pavel Tatashin
2019-08-21 18:32 ` [PATCH v3 16/17] arm64, kexec: configure trans_pgd page table for kexec Pavel Tatashin
2019-08-21 18:32 ` [PATCH v3 17/17] arm64, kexec: enable MMU during kexec relocation Pavel Tatashin
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