![Mel Gorman](/assets/img/avatar_default.png)
Commit4b59e6c473
("mm, show_mem: suppress page counts in non-blockable contexts") introduced SHOW_MEM_FILTER_PAGE_COUNT to suppress PFN walks on large memory machines. Commitc78e93630d
("mm: do not walk all of system memory during show_mem") avoided a PFN walk in the generic show_mem helper which removes the requirement for SHOW_MEM_FILTER_PAGE_COUNT in that case. This patch removes PFN walkers from the arch-specific implementations that report on a per-node or per-zone granularity. ARM and unicore32 still do a PFN walk as they report memory usage on each bank which is a much finer granularity where the debugging information may still be of use. As the remaining arches doing PFN walks have relatively small amounts of memory, this patch simply removes SHOW_MEM_FILTER_PAGE_COUNT. [akpm@linux-foundation.org: fix parisc] Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: David Rientjes <rientjes@google.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Russell King <linux@arm.linux.org.uk> Cc: James Bottomley <jejb@parisc-linux.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
452 lines
11 KiB
C
452 lines
11 KiB
C
/*
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* linux/arch/unicore32/mm/init.c
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*
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* Copyright (C) 2010 GUAN Xue-tao
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/swap.h>
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#include <linux/init.h>
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#include <linux/bootmem.h>
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#include <linux/mman.h>
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#include <linux/nodemask.h>
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#include <linux/initrd.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/memblock.h>
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#include <linux/sort.h>
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#include <linux/dma-mapping.h>
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#include <linux/export.h>
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#include <asm/sections.h>
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#include <asm/setup.h>
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#include <asm/sizes.h>
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#include <asm/tlb.h>
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#include <asm/memblock.h>
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#include <mach/map.h>
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#include "mm.h"
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static unsigned long phys_initrd_start __initdata = 0x01000000;
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static unsigned long phys_initrd_size __initdata = SZ_8M;
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static int __init early_initrd(char *p)
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{
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unsigned long start, size;
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char *endp;
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start = memparse(p, &endp);
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if (*endp == ',') {
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size = memparse(endp + 1, NULL);
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phys_initrd_start = start;
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phys_initrd_size = size;
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}
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return 0;
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}
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early_param("initrd", early_initrd);
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/*
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* This keeps memory configuration data used by a couple memory
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* initialization functions, as well as show_mem() for the skipping
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* of holes in the memory map. It is populated by uc32_add_memory().
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*/
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struct meminfo meminfo;
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void show_mem(unsigned int filter)
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{
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int free = 0, total = 0, reserved = 0;
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int shared = 0, cached = 0, slab = 0, i;
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struct meminfo *mi = &meminfo;
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printk(KERN_DEFAULT "Mem-info:\n");
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show_free_areas(filter);
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for_each_bank(i, mi) {
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struct membank *bank = &mi->bank[i];
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unsigned int pfn1, pfn2;
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struct page *page, *end;
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pfn1 = bank_pfn_start(bank);
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pfn2 = bank_pfn_end(bank);
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page = pfn_to_page(pfn1);
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end = pfn_to_page(pfn2 - 1) + 1;
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do {
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total++;
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if (PageReserved(page))
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reserved++;
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else if (PageSwapCache(page))
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cached++;
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else if (PageSlab(page))
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slab++;
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else if (!page_count(page))
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free++;
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else
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shared += page_count(page) - 1;
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page++;
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} while (page < end);
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}
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printk(KERN_DEFAULT "%d pages of RAM\n", total);
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printk(KERN_DEFAULT "%d free pages\n", free);
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printk(KERN_DEFAULT "%d reserved pages\n", reserved);
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printk(KERN_DEFAULT "%d slab pages\n", slab);
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printk(KERN_DEFAULT "%d pages shared\n", shared);
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printk(KERN_DEFAULT "%d pages swap cached\n", cached);
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}
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static void __init find_limits(unsigned long *min, unsigned long *max_low,
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unsigned long *max_high)
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{
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struct meminfo *mi = &meminfo;
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int i;
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*min = -1UL;
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*max_low = *max_high = 0;
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for_each_bank(i, mi) {
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struct membank *bank = &mi->bank[i];
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unsigned long start, end;
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start = bank_pfn_start(bank);
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end = bank_pfn_end(bank);
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if (*min > start)
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*min = start;
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if (*max_high < end)
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*max_high = end;
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if (bank->highmem)
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continue;
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if (*max_low < end)
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*max_low = end;
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}
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}
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static void __init uc32_bootmem_init(unsigned long start_pfn,
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unsigned long end_pfn)
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{
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struct memblock_region *reg;
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unsigned int boot_pages;
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phys_addr_t bitmap;
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pg_data_t *pgdat;
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/*
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* Allocate the bootmem bitmap page. This must be in a region
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* of memory which has already been mapped.
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*/
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boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
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bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
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__pfn_to_phys(end_pfn));
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/*
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* Initialise the bootmem allocator, handing the
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* memory banks over to bootmem.
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*/
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node_set_online(0);
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pgdat = NODE_DATA(0);
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init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
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/* Free the lowmem regions from memblock into bootmem. */
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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free_bootmem(__pfn_to_phys(start), (end - start) << PAGE_SHIFT);
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}
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/* Reserve the lowmem memblock reserved regions in bootmem. */
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for_each_memblock(reserved, reg) {
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unsigned long start = memblock_region_reserved_base_pfn(reg);
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unsigned long end = memblock_region_reserved_end_pfn(reg);
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if (end >= end_pfn)
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end = end_pfn;
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if (start >= end)
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break;
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reserve_bootmem(__pfn_to_phys(start),
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(end - start) << PAGE_SHIFT, BOOTMEM_DEFAULT);
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}
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}
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static void __init uc32_bootmem_free(unsigned long min, unsigned long max_low,
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unsigned long max_high)
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{
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unsigned long zone_size[MAX_NR_ZONES], zhole_size[MAX_NR_ZONES];
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struct memblock_region *reg;
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/*
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* initialise the zones.
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*/
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memset(zone_size, 0, sizeof(zone_size));
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/*
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* The memory size has already been determined. If we need
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* to do anything fancy with the allocation of this memory
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* to the zones, now is the time to do it.
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*/
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zone_size[0] = max_low - min;
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/*
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* Calculate the size of the holes.
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* holes = node_size - sum(bank_sizes)
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*/
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memcpy(zhole_size, zone_size, sizeof(zhole_size));
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for_each_memblock(memory, reg) {
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unsigned long start = memblock_region_memory_base_pfn(reg);
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unsigned long end = memblock_region_memory_end_pfn(reg);
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if (start < max_low) {
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unsigned long low_end = min(end, max_low);
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zhole_size[0] -= low_end - start;
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}
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}
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/*
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* Adjust the sizes according to any special requirements for
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* this machine type.
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*/
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arch_adjust_zones(zone_size, zhole_size);
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free_area_init_node(0, zone_size, min, zhole_size);
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}
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int pfn_valid(unsigned long pfn)
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{
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return memblock_is_memory(pfn << PAGE_SHIFT);
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}
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EXPORT_SYMBOL(pfn_valid);
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static void uc32_memory_present(void)
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{
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}
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static int __init meminfo_cmp(const void *_a, const void *_b)
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{
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const struct membank *a = _a, *b = _b;
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long cmp = bank_pfn_start(a) - bank_pfn_start(b);
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return cmp < 0 ? -1 : cmp > 0 ? 1 : 0;
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}
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void __init uc32_memblock_init(struct meminfo *mi)
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{
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int i;
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sort(&meminfo.bank, meminfo.nr_banks, sizeof(meminfo.bank[0]),
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meminfo_cmp, NULL);
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for (i = 0; i < mi->nr_banks; i++)
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memblock_add(mi->bank[i].start, mi->bank[i].size);
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/* Register the kernel text, kernel data and initrd with memblock. */
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memblock_reserve(__pa(_text), _end - _text);
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#ifdef CONFIG_BLK_DEV_INITRD
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if (phys_initrd_size) {
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memblock_reserve(phys_initrd_start, phys_initrd_size);
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/* Now convert initrd to virtual addresses */
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initrd_start = __phys_to_virt(phys_initrd_start);
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initrd_end = initrd_start + phys_initrd_size;
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}
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#endif
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uc32_mm_memblock_reserve();
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memblock_allow_resize();
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memblock_dump_all();
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}
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void __init bootmem_init(void)
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{
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unsigned long min, max_low, max_high;
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max_low = max_high = 0;
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find_limits(&min, &max_low, &max_high);
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uc32_bootmem_init(min, max_low);
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#ifdef CONFIG_SWIOTLB
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swiotlb_init(1);
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#endif
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/*
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* Sparsemem tries to allocate bootmem in memory_present(),
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* so must be done after the fixed reservations
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*/
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uc32_memory_present();
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/*
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* sparse_init() needs the bootmem allocator up and running.
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*/
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sparse_init();
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/*
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* Now free the memory - free_area_init_node needs
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* the sparse mem_map arrays initialized by sparse_init()
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* for memmap_init_zone(), otherwise all PFNs are invalid.
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*/
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uc32_bootmem_free(min, max_low, max_high);
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high_memory = __va((max_low << PAGE_SHIFT) - 1) + 1;
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/*
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* This doesn't seem to be used by the Linux memory manager any
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* more, but is used by ll_rw_block. If we can get rid of it, we
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* also get rid of some of the stuff above as well.
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*
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* Note: max_low_pfn and max_pfn reflect the number of _pages_ in
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* the system, not the maximum PFN.
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*/
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max_low_pfn = max_low - PHYS_PFN_OFFSET;
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max_pfn = max_high - PHYS_PFN_OFFSET;
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}
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static inline void
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free_memmap(unsigned long start_pfn, unsigned long end_pfn)
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{
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struct page *start_pg, *end_pg;
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unsigned long pg, pgend;
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/*
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* Convert start_pfn/end_pfn to a struct page pointer.
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*/
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start_pg = pfn_to_page(start_pfn - 1) + 1;
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end_pg = pfn_to_page(end_pfn);
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/*
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* Convert to physical addresses, and
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* round start upwards and end downwards.
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*/
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pg = PAGE_ALIGN(__pa(start_pg));
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pgend = __pa(end_pg) & PAGE_MASK;
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/*
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* If there are free pages between these,
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* free the section of the memmap array.
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*/
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if (pg < pgend)
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free_bootmem(pg, pgend - pg);
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}
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/*
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* The mem_map array can get very big. Free the unused area of the memory map.
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*/
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static void __init free_unused_memmap(struct meminfo *mi)
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{
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unsigned long bank_start, prev_bank_end = 0;
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unsigned int i;
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/*
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* This relies on each bank being in address order.
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* The banks are sorted previously in bootmem_init().
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*/
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for_each_bank(i, mi) {
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struct membank *bank = &mi->bank[i];
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bank_start = bank_pfn_start(bank);
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/*
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* If we had a previous bank, and there is a space
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* between the current bank and the previous, free it.
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*/
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if (prev_bank_end && prev_bank_end < bank_start)
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free_memmap(prev_bank_end, bank_start);
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/*
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* Align up here since the VM subsystem insists that the
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* memmap entries are valid from the bank end aligned to
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* MAX_ORDER_NR_PAGES.
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*/
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prev_bank_end = ALIGN(bank_pfn_end(bank), MAX_ORDER_NR_PAGES);
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}
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}
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/*
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* mem_init() marks the free areas in the mem_map and tells us how much
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* memory is free. This is done after various parts of the system have
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* claimed their memory after the kernel image.
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*/
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void __init mem_init(void)
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{
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max_mapnr = pfn_to_page(max_pfn + PHYS_PFN_OFFSET) - mem_map;
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free_unused_memmap(&meminfo);
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/* this will put all unused low memory onto the freelists */
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free_all_bootmem();
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mem_init_print_info(NULL);
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printk(KERN_NOTICE "Virtual kernel memory layout:\n"
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" vector : 0x%08lx - 0x%08lx (%4ld kB)\n"
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" vmalloc : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" lowmem : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" modules : 0x%08lx - 0x%08lx (%4ld MB)\n"
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" .init : 0x%p" " - 0x%p" " (%4d kB)\n"
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" .text : 0x%p" " - 0x%p" " (%4d kB)\n"
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" .data : 0x%p" " - 0x%p" " (%4d kB)\n",
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VECTORS_BASE, VECTORS_BASE + PAGE_SIZE,
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DIV_ROUND_UP(PAGE_SIZE, SZ_1K),
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VMALLOC_START, VMALLOC_END,
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DIV_ROUND_UP((VMALLOC_END - VMALLOC_START), SZ_1M),
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PAGE_OFFSET, (unsigned long)high_memory,
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DIV_ROUND_UP(((unsigned long)high_memory - PAGE_OFFSET), SZ_1M),
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MODULES_VADDR, MODULES_END,
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DIV_ROUND_UP((MODULES_END - MODULES_VADDR), SZ_1M),
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__init_begin, __init_end,
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DIV_ROUND_UP((__init_end - __init_begin), SZ_1K),
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_stext, _etext,
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DIV_ROUND_UP((_etext - _stext), SZ_1K),
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_sdata, _edata,
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DIV_ROUND_UP((_edata - _sdata), SZ_1K));
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BUILD_BUG_ON(TASK_SIZE > MODULES_VADDR);
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BUG_ON(TASK_SIZE > MODULES_VADDR);
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if (PAGE_SIZE >= 16384 && get_num_physpages() <= 128) {
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/*
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* On a machine this small we won't get
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* anywhere without overcommit, so turn
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* it on by default.
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*/
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sysctl_overcommit_memory = OVERCOMMIT_ALWAYS;
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}
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}
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void free_initmem(void)
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{
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free_initmem_default(-1);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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static int keep_initrd;
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void free_initrd_mem(unsigned long start, unsigned long end)
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{
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if (!keep_initrd)
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free_reserved_area((void *)start, (void *)end, -1, "initrd");
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}
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static int __init keepinitrd_setup(char *__unused)
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{
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keep_initrd = 1;
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return 1;
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}
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__setup("keepinitrd", keepinitrd_setup);
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#endif
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