diff options
| author | Tejun Heo <tj@kernel.org> | 2011-01-25 14:26:50 +0100 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2011-01-25 14:26:50 +0100 |
| commit | 19df0c2fef010e94e90df514aaf4e73f6b80145c (patch) | |
| tree | 4b0b9c10622aead0d8b658cca6c49090149a91a8 /arch/x86/kernel | |
| parent | c723fdab8aa728dc2bf0da6a0de8bb9c3f588d84 (diff) | |
percpu: align percpu readmostly subsection to cacheline
Currently percpu readmostly subsection may share cachelines with other
percpu subsections which may result in unnecessary cacheline bounce
and performance degradation.
This patch adds @cacheline parameter to PERCPU() and PERCPU_VADDR()
linker macros, makes each arch linker scripts specify its cacheline
size and use it to align percpu subsections.
This is based on Shaohua's x86 only patch.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Shaohua Li <shaohua.li@intel.com>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/vmlinux.lds.S | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S index bf470075518..cef446f8ac7 100644 --- a/arch/x86/kernel/vmlinux.lds.S +++ b/arch/x86/kernel/vmlinux.lds.S @@ -230,7 +230,7 @@ SECTIONS * output PHDR, so the next output section - .init.text - should * start another segment - init. */ - PERCPU_VADDR(0, :percpu) + PERCPU_VADDR(INTERNODE_CACHE_BYTES, 0, :percpu) #endif INIT_TEXT_SECTION(PAGE_SIZE) @@ -305,7 +305,7 @@ SECTIONS } #if !defined(CONFIG_X86_64) || !defined(CONFIG_SMP) - PERCPU(THREAD_SIZE) + PERCPU(INTERNODE_CACHE_BYTES, THREAD_SIZE) #endif . = ALIGN(PAGE_SIZE); |