[Blackfin] arch: move the init sections to the end of memory
Move the init sections to the end of memory so that after they are free, run time memory is all continugous - this should help decrease memory fragementation. When doing this, we also pack some of the other sections a little closer together, to make sure we don't waste memory. To make this happen, we need to rename the .data.init_task section to .init_task.data, so it doesn't get picked up by the linker script glob. Signed-off-by: Mike Frysinger <vapier.adi@gmail.com> Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Mike Frysinger
Bryan Wu
Родитель
80f31c8a03
Коммит
b7627acc43
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@ -57,5 +57,5 @@ EXPORT_SYMBOL(init_task);
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* "init_task" linker map entry.
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*/
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union thread_union init_thread_union
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__attribute__ ((__section__(".data.init_task"))) = {
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__attribute__ ((__section__(".init_task.data"))) = {
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INIT_THREAD_INFO(init_task)};
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@ -427,7 +427,7 @@ static __init void parse_cmdline_early(char *cmdline_p)
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static __init void memory_setup(void)
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{
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_rambase = (unsigned long)_stext;
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_ramstart = (unsigned long)__bss_stop;
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_ramstart = (unsigned long)_end;
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if (DMA_UNCACHED_REGION > (_ramend - _ramstart)) {
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console_init();
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@ -489,7 +489,7 @@ static __init void memory_setup(void)
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}
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/* Relocate MTD image to the top of memory after the uncached memory area */
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dma_memcpy((char *)memory_end, __bss_stop, mtd_size);
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dma_memcpy((char *)memory_end, _end, mtd_size);
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memory_mtd_start = memory_end;
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_ebss = memory_mtd_start; /* define _ebss for compatible */
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@ -528,13 +528,13 @@ static __init void memory_setup(void)
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printk(KERN_INFO "Board Memory: %ldMB\n", physical_mem_end >> 20);
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printk(KERN_INFO "Kernel Managed Memory: %ldMB\n", _ramend >> 20);
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printk( KERN_INFO "Memory map:\n"
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printk(KERN_INFO "Memory map:\n"
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KERN_INFO " text = 0x%p-0x%p\n"
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KERN_INFO " rodata = 0x%p-0x%p\n"
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KERN_INFO " bss = 0x%p-0x%p\n"
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KERN_INFO " data = 0x%p-0x%p\n"
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KERN_INFO " stack = 0x%p-0x%p\n"
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KERN_INFO " init = 0x%p-0x%p\n"
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KERN_INFO " bss = 0x%p-0x%p\n"
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KERN_INFO " available = 0x%p-0x%p\n"
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#ifdef CONFIG_MTD_UCLINUX
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KERN_INFO " rootfs = 0x%p-0x%p\n"
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@ -544,12 +544,12 @@ static __init void memory_setup(void)
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#endif
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, _stext, _etext,
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__start_rodata, __end_rodata,
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__bss_start, __bss_stop,
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_sdata, _edata,
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(void *)&init_thread_union,
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(void *)((int)(&init_thread_union) + 0x2000),
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__init_begin, __init_end,
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__bss_start, __bss_stop,
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(void *)_ramstart, (void *)memory_end
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__init_begin, __init_end,
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(void *)_ramstart, (void *)memory_end
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#ifdef CONFIG_MTD_UCLINUX
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, (void *)memory_mtd_start, (void *)(memory_mtd_start + mtd_size)
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#endif
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@ -41,6 +41,9 @@ _jiffies = _jiffies_64;
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SECTIONS
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{
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. = CONFIG_BOOT_LOAD;
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/* Neither the text, ro_data or bss section need to be aligned
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* So pack them back to back
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*/
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.text :
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{
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__text = .;
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@ -58,22 +61,25 @@ SECTIONS
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*(__ex_table)
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___stop___ex_table = .;
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. = ALIGN(4);
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__etext = .;
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}
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RO_DATA(PAGE_SIZE)
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/* Just in case the first read only is a 32-bit access */
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RO_DATA(4)
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.bss :
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{
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. = ALIGN(4);
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___bss_start = .;
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*(.bss .bss.*)
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*(COMMON)
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___bss_stop = .;
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}
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.data :
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{
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/* make sure the init_task is aligned to the
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* kernel thread size so we can locate the kernel
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* stack properly and quickly.
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*/
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__sdata = .;
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. = ALIGN(THREAD_SIZE);
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*(.data.init_task)
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/* This gets done first, so the glob doesn't suck it in */
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. = ALIGN(32);
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*(.data.cacheline_aligned)
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@ -81,10 +87,22 @@ SECTIONS
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*(.data.*)
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CONSTRUCTORS
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/* make sure the init_task is aligned to the
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* kernel thread size so we can locate the kernel
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* stack properly and quickly.
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*/
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. = ALIGN(THREAD_SIZE);
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*(.init_task.data)
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__edata = .;
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}
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/* The init section should be last, so when we free it, it goes into
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* the general memory pool, and (hopefully) will decrease fragmentation
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* a tiny bit. The init section has a _requirement_ that it be
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* PAGE_SIZE aligned
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*/
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. = ALIGN(PAGE_SIZE);
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___init_begin = .;
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.init.text :
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@ -179,16 +197,7 @@ SECTIONS
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. = ALIGN(PAGE_SIZE);
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___init_end = .;
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.bss :
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{
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. = ALIGN(4);
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___bss_start = .;
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*(.bss .bss.*)
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*(COMMON)
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. = ALIGN(4);
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___bss_stop = .;
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__end = .;
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}
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__end =.;
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STABS_DEBUG
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