linux-kernel - [PATCH 0/3] arm64: put objects into proper sections

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Date:	Wed, 10 Aug 2016 15:19:16 +0800
From:	Jisheng Zhang <jszhang@...vell.com>
To:	<catalin.marinas@....com>, <will.deacon@....com>,
	<lorenzo.pieralisi@....com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, Jisheng Zhang <jszhang@...vell.com>
Subject: [PATCH 0/3] arm64: put objects into proper sections

This series tries to put objects into proper sections to avoid
pontential unnecessary DDR traffics:

patch1 puts alloc_vectors_page() into .init section. This is a clean up
patch.

patch2 puts vdso_pages, vdso_spec and vectors_page into read_mostly
section, since they are read mostly in hot path.

patch3 puts cpu_ops into read_mostly section, since it's read mostly
int hot path such as arm_cpuidle_suspend().

Before this series:

ffff000008d660f0 b undef_lock
ffff000008d660f8 b vectors_page
ffff000008d66100 b vdso_pages
ffff000008d66108 b vdso_spec
ffff000008d66148 B cpu_ops
ffff000008d66348 b patch_lock

After this series:

ffff000008ca5b08 D static_key_initialized
ffff000008ca5b10 d vectors_page
ffff000008ca5b18 d vdso_pages
ffff000008ca5b20 d vdso_spec
ffff000008ca5b60 D cpu_ops
ffff000008ca5d60 D elf_hwcap
ffff000008ca5d68 D compat_elf_hwcap
ffff000008ca5d6c D compat_elf_hwcap2

Although there's no obvious issue with current code, because undef_lock and
patch_lock is rarely used, but the situation may change in the future, so
let's move them into proper sections now.

Jisheng Zhang (3):
  arm64: vdso: add __init section marker to alloc_vectors_page
  arm64: vdso: put read only/mostly objects into proper sections
  arm64: kernel: declare cpu_ops __read_mostly

 arch/arm64/kernel/cpu_ops.c |  2 +-
 arch/arm64/kernel/vdso.c    | 31 +++++++++++++++----------------
 2 files changed, 16 insertions(+), 17 deletions(-)

-- 
2.8.1