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![Tejun Heo](/assets/img/avatar_default.png)
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>
88 lines
1.6 KiB
ArmAsm
88 lines
1.6 KiB
ArmAsm
/*
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* ld script to make SuperH Linux kernel
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* Written by Niibe Yutaka and Paul Mundt
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*/
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#ifdef CONFIG_SUPERH64
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#define LOAD_OFFSET PAGE_OFFSET
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OUTPUT_ARCH(sh:sh5)
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#else
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#define LOAD_OFFSET 0
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OUTPUT_ARCH(sh)
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#endif
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#include <asm/thread_info.h>
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#include <asm/cache.h>
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#include <asm/vmlinux.lds.h>
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#ifdef CONFIG_PMB
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#define MEMORY_OFFSET 0
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#else
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#define MEMORY_OFFSET __MEMORY_START
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#endif
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ENTRY(_start)
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SECTIONS
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{
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. = PAGE_OFFSET + MEMORY_OFFSET + CONFIG_ZERO_PAGE_OFFSET;
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_text = .; /* Text and read-only data */
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.empty_zero_page : AT(ADDR(.empty_zero_page) - LOAD_OFFSET) {
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*(.empty_zero_page)
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} = 0
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.text : AT(ADDR(.text) - LOAD_OFFSET) {
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HEAD_TEXT
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TEXT_TEXT
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EXTRA_TEXT
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SCHED_TEXT
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LOCK_TEXT
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KPROBES_TEXT
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IRQENTRY_TEXT
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*(.fixup)
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*(.gnu.warning)
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_etext = .; /* End of text section */
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} = 0x0009
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EXCEPTION_TABLE(16)
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NOTES
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_sdata = .;
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RO_DATA(PAGE_SIZE)
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RW_DATA_SECTION(L1_CACHE_BYTES, PAGE_SIZE, THREAD_SIZE)
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_edata = .;
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DWARF_EH_FRAME
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. = ALIGN(PAGE_SIZE); /* Init code and data */
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__init_begin = .;
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INIT_TEXT_SECTION(PAGE_SIZE)
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INIT_DATA_SECTION(16)
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. = ALIGN(4);
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.machvec.init : AT(ADDR(.machvec.init) - LOAD_OFFSET) {
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__machvec_start = .;
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*(.machvec.init)
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__machvec_end = .;
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}
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PERCPU(L1_CACHE_BYTES, PAGE_SIZE)
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/*
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* .exit.text is discarded at runtime, not link time, to deal with
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* references from __bug_table
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*/
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.exit.text : AT(ADDR(.exit.text) - LOAD_OFFSET) { EXIT_TEXT }
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.exit.data : AT(ADDR(.exit.data) - LOAD_OFFSET) { EXIT_DATA }
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. = ALIGN(PAGE_SIZE);
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__init_end = .;
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BSS_SECTION(0, PAGE_SIZE, 4)
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_ebss = .; /* uClinux MTD sucks */
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_end = . ;
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STABS_DEBUG
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DWARF_DEBUG
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DISCARDS
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}
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