430 lines
12 KiB
C
430 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Generic show_mem() implementation
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*
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* Copyright (C) 2008 Johannes Weiner <hannes@saeurebad.de>
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*/
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#include <linux/blkdev.h>
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#include <linux/cma.h>
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#include <linux/cpuset.h>
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#include <linux/highmem.h>
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#include <linux/hugetlb.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/swap.h>
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#include <linux/vmstat.h>
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#include "internal.h"
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#include "swap.h"
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atomic_long_t _totalram_pages __read_mostly;
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EXPORT_SYMBOL(_totalram_pages);
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unsigned long totalreserve_pages __read_mostly;
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unsigned long totalcma_pages __read_mostly;
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static inline void show_node(struct zone *zone)
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{
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if (IS_ENABLED(CONFIG_NUMA))
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printk("Node %d ", zone_to_nid(zone));
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}
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long si_mem_available(void)
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{
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long available;
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unsigned long pagecache;
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unsigned long wmark_low = 0;
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unsigned long pages[NR_LRU_LISTS];
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unsigned long reclaimable;
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struct zone *zone;
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int lru;
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for (lru = LRU_BASE; lru < NR_LRU_LISTS; lru++)
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pages[lru] = global_node_page_state(NR_LRU_BASE + lru);
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for_each_zone(zone)
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wmark_low += low_wmark_pages(zone);
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/*
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* Estimate the amount of memory available for userspace allocations,
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* without causing swapping or OOM.
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*/
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available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages;
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/*
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* Not all the page cache can be freed, otherwise the system will
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* start swapping or thrashing. Assume at least half of the page
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* cache, or the low watermark worth of cache, needs to stay.
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*/
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pagecache = pages[LRU_ACTIVE_FILE] + pages[LRU_INACTIVE_FILE];
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pagecache -= min(pagecache / 2, wmark_low);
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available += pagecache;
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/*
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* Part of the reclaimable slab and other kernel memory consists of
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* items that are in use, and cannot be freed. Cap this estimate at the
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* low watermark.
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*/
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reclaimable = global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B) +
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global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
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available += reclaimable - min(reclaimable / 2, wmark_low);
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if (available < 0)
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available = 0;
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return available;
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}
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EXPORT_SYMBOL_GPL(si_mem_available);
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void si_meminfo(struct sysinfo *val)
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{
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val->totalram = totalram_pages();
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val->sharedram = global_node_page_state(NR_SHMEM);
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val->freeram = global_zone_page_state(NR_FREE_PAGES);
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val->bufferram = nr_blockdev_pages();
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val->totalhigh = totalhigh_pages();
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val->freehigh = nr_free_highpages();
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val->mem_unit = PAGE_SIZE;
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}
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EXPORT_SYMBOL(si_meminfo);
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#ifdef CONFIG_NUMA
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void si_meminfo_node(struct sysinfo *val, int nid)
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{
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int zone_type; /* needs to be signed */
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unsigned long managed_pages = 0;
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unsigned long managed_highpages = 0;
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unsigned long free_highpages = 0;
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pg_data_t *pgdat = NODE_DATA(nid);
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for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++)
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managed_pages += zone_managed_pages(&pgdat->node_zones[zone_type]);
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val->totalram = managed_pages;
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val->sharedram = node_page_state(pgdat, NR_SHMEM);
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val->freeram = sum_zone_node_page_state(nid, NR_FREE_PAGES);
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#ifdef CONFIG_HIGHMEM
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for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) {
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struct zone *zone = &pgdat->node_zones[zone_type];
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if (is_highmem(zone)) {
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managed_highpages += zone_managed_pages(zone);
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free_highpages += zone_page_state(zone, NR_FREE_PAGES);
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}
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}
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val->totalhigh = managed_highpages;
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val->freehigh = free_highpages;
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#else
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val->totalhigh = managed_highpages;
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val->freehigh = free_highpages;
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#endif
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val->mem_unit = PAGE_SIZE;
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}
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#endif
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/*
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* Determine whether the node should be displayed or not, depending on whether
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* SHOW_MEM_FILTER_NODES was passed to show_free_areas().
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*/
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static bool show_mem_node_skip(unsigned int flags, int nid, nodemask_t *nodemask)
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{
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if (!(flags & SHOW_MEM_FILTER_NODES))
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return false;
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/*
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* no node mask - aka implicit memory numa policy. Do not bother with
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* the synchronization - read_mems_allowed_begin - because we do not
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* have to be precise here.
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*/
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if (!nodemask)
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nodemask = &cpuset_current_mems_allowed;
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return !node_isset(nid, *nodemask);
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}
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static void show_migration_types(unsigned char type)
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{
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static const char types[MIGRATE_TYPES] = {
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[MIGRATE_UNMOVABLE] = 'U',
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[MIGRATE_MOVABLE] = 'M',
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[MIGRATE_RECLAIMABLE] = 'E',
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[MIGRATE_HIGHATOMIC] = 'H',
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#ifdef CONFIG_CMA
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[MIGRATE_CMA] = 'C',
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#endif
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#ifdef CONFIG_MEMORY_ISOLATION
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[MIGRATE_ISOLATE] = 'I',
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#endif
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};
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char tmp[MIGRATE_TYPES + 1];
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char *p = tmp;
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int i;
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for (i = 0; i < MIGRATE_TYPES; i++) {
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if (type & (1 << i))
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*p++ = types[i];
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}
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*p = '\0';
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printk(KERN_CONT "(%s) ", tmp);
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}
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static bool node_has_managed_zones(pg_data_t *pgdat, int max_zone_idx)
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{
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int zone_idx;
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for (zone_idx = 0; zone_idx <= max_zone_idx; zone_idx++)
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if (zone_managed_pages(pgdat->node_zones + zone_idx))
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return true;
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return false;
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}
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/*
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* Show free area list (used inside shift_scroll-lock stuff)
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* We also calculate the percentage fragmentation. We do this by counting the
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* memory on each free list with the exception of the first item on the list.
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*
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* Bits in @filter:
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* SHOW_MEM_FILTER_NODES: suppress nodes that are not allowed by current's
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* cpuset.
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*/
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void __show_free_areas(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
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{
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unsigned long free_pcp = 0;
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int cpu, nid;
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struct zone *zone;
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pg_data_t *pgdat;
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for_each_populated_zone(zone) {
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if (zone_idx(zone) > max_zone_idx)
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continue;
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if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
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continue;
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for_each_online_cpu(cpu)
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free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count;
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}
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printk("active_anon:%lu inactive_anon:%lu isolated_anon:%lu\n"
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" active_file:%lu inactive_file:%lu isolated_file:%lu\n"
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" unevictable:%lu dirty:%lu writeback:%lu\n"
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" slab_reclaimable:%lu slab_unreclaimable:%lu\n"
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" mapped:%lu shmem:%lu pagetables:%lu\n"
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" sec_pagetables:%lu bounce:%lu\n"
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" kernel_misc_reclaimable:%lu\n"
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" free:%lu free_pcp:%lu free_cma:%lu\n",
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global_node_page_state(NR_ACTIVE_ANON),
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global_node_page_state(NR_INACTIVE_ANON),
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global_node_page_state(NR_ISOLATED_ANON),
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global_node_page_state(NR_ACTIVE_FILE),
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global_node_page_state(NR_INACTIVE_FILE),
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global_node_page_state(NR_ISOLATED_FILE),
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global_node_page_state(NR_UNEVICTABLE),
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global_node_page_state(NR_FILE_DIRTY),
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global_node_page_state(NR_WRITEBACK),
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global_node_page_state_pages(NR_SLAB_RECLAIMABLE_B),
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global_node_page_state_pages(NR_SLAB_UNRECLAIMABLE_B),
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global_node_page_state(NR_FILE_MAPPED),
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global_node_page_state(NR_SHMEM),
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global_node_page_state(NR_PAGETABLE),
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global_node_page_state(NR_SECONDARY_PAGETABLE),
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global_zone_page_state(NR_BOUNCE),
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global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE),
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global_zone_page_state(NR_FREE_PAGES),
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free_pcp,
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global_zone_page_state(NR_FREE_CMA_PAGES));
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for_each_online_pgdat(pgdat) {
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if (show_mem_node_skip(filter, pgdat->node_id, nodemask))
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continue;
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if (!node_has_managed_zones(pgdat, max_zone_idx))
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continue;
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printk("Node %d"
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" active_anon:%lukB"
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" inactive_anon:%lukB"
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" active_file:%lukB"
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" inactive_file:%lukB"
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" unevictable:%lukB"
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" isolated(anon):%lukB"
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" isolated(file):%lukB"
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" mapped:%lukB"
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" dirty:%lukB"
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" writeback:%lukB"
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" shmem:%lukB"
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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" shmem_thp: %lukB"
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" shmem_pmdmapped: %lukB"
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" anon_thp: %lukB"
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#endif
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" writeback_tmp:%lukB"
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" kernel_stack:%lukB"
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#ifdef CONFIG_SHADOW_CALL_STACK
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" shadow_call_stack:%lukB"
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#endif
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" pagetables:%lukB"
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" sec_pagetables:%lukB"
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" all_unreclaimable? %s"
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"\n",
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pgdat->node_id,
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K(node_page_state(pgdat, NR_ACTIVE_ANON)),
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K(node_page_state(pgdat, NR_INACTIVE_ANON)),
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K(node_page_state(pgdat, NR_ACTIVE_FILE)),
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K(node_page_state(pgdat, NR_INACTIVE_FILE)),
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K(node_page_state(pgdat, NR_UNEVICTABLE)),
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K(node_page_state(pgdat, NR_ISOLATED_ANON)),
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K(node_page_state(pgdat, NR_ISOLATED_FILE)),
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K(node_page_state(pgdat, NR_FILE_MAPPED)),
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K(node_page_state(pgdat, NR_FILE_DIRTY)),
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K(node_page_state(pgdat, NR_WRITEBACK)),
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K(node_page_state(pgdat, NR_SHMEM)),
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#ifdef CONFIG_TRANSPARENT_HUGEPAGE
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K(node_page_state(pgdat, NR_SHMEM_THPS)),
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K(node_page_state(pgdat, NR_SHMEM_PMDMAPPED)),
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K(node_page_state(pgdat, NR_ANON_THPS)),
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#endif
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K(node_page_state(pgdat, NR_WRITEBACK_TEMP)),
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node_page_state(pgdat, NR_KERNEL_STACK_KB),
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#ifdef CONFIG_SHADOW_CALL_STACK
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node_page_state(pgdat, NR_KERNEL_SCS_KB),
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#endif
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K(node_page_state(pgdat, NR_PAGETABLE)),
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K(node_page_state(pgdat, NR_SECONDARY_PAGETABLE)),
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pgdat->kswapd_failures >= MAX_RECLAIM_RETRIES ?
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"yes" : "no");
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}
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for_each_populated_zone(zone) {
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int i;
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if (zone_idx(zone) > max_zone_idx)
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continue;
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if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
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continue;
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free_pcp = 0;
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for_each_online_cpu(cpu)
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free_pcp += per_cpu_ptr(zone->per_cpu_pageset, cpu)->count;
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show_node(zone);
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printk(KERN_CONT
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"%s"
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" free:%lukB"
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" boost:%lukB"
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" min:%lukB"
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" low:%lukB"
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" high:%lukB"
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" reserved_highatomic:%luKB"
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" active_anon:%lukB"
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" inactive_anon:%lukB"
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" active_file:%lukB"
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" inactive_file:%lukB"
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" unevictable:%lukB"
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" writepending:%lukB"
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" present:%lukB"
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" managed:%lukB"
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" mlocked:%lukB"
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" bounce:%lukB"
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" free_pcp:%lukB"
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" local_pcp:%ukB"
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" free_cma:%lukB"
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"\n",
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zone->name,
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K(zone_page_state(zone, NR_FREE_PAGES)),
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K(zone->watermark_boost),
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K(min_wmark_pages(zone)),
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K(low_wmark_pages(zone)),
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K(high_wmark_pages(zone)),
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K(zone->nr_reserved_highatomic),
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K(zone_page_state(zone, NR_ZONE_ACTIVE_ANON)),
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K(zone_page_state(zone, NR_ZONE_INACTIVE_ANON)),
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K(zone_page_state(zone, NR_ZONE_ACTIVE_FILE)),
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K(zone_page_state(zone, NR_ZONE_INACTIVE_FILE)),
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K(zone_page_state(zone, NR_ZONE_UNEVICTABLE)),
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K(zone_page_state(zone, NR_ZONE_WRITE_PENDING)),
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K(zone->present_pages),
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K(zone_managed_pages(zone)),
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K(zone_page_state(zone, NR_MLOCK)),
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K(zone_page_state(zone, NR_BOUNCE)),
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K(free_pcp),
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K(this_cpu_read(zone->per_cpu_pageset->count)),
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K(zone_page_state(zone, NR_FREE_CMA_PAGES)));
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printk("lowmem_reserve[]:");
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for (i = 0; i < MAX_NR_ZONES; i++)
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printk(KERN_CONT " %ld", zone->lowmem_reserve[i]);
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printk(KERN_CONT "\n");
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}
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for_each_populated_zone(zone) {
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unsigned int order;
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unsigned long nr[MAX_ORDER + 1], flags, total = 0;
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unsigned char types[MAX_ORDER + 1];
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if (zone_idx(zone) > max_zone_idx)
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continue;
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if (show_mem_node_skip(filter, zone_to_nid(zone), nodemask))
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continue;
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show_node(zone);
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printk(KERN_CONT "%s: ", zone->name);
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spin_lock_irqsave(&zone->lock, flags);
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for (order = 0; order <= MAX_ORDER; order++) {
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struct free_area *area = &zone->free_area[order];
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int type;
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nr[order] = area->nr_free;
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total += nr[order] << order;
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types[order] = 0;
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for (type = 0; type < MIGRATE_TYPES; type++) {
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if (!free_area_empty(area, type))
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types[order] |= 1 << type;
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}
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}
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spin_unlock_irqrestore(&zone->lock, flags);
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for (order = 0; order <= MAX_ORDER; order++) {
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printk(KERN_CONT "%lu*%lukB ",
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nr[order], K(1UL) << order);
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if (nr[order])
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show_migration_types(types[order]);
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}
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printk(KERN_CONT "= %lukB\n", K(total));
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}
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for_each_online_node(nid) {
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if (show_mem_node_skip(filter, nid, nodemask))
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continue;
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hugetlb_show_meminfo_node(nid);
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}
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printk("%ld total pagecache pages\n", global_node_page_state(NR_FILE_PAGES));
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show_swap_cache_info();
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}
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void __show_mem(unsigned int filter, nodemask_t *nodemask, int max_zone_idx)
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{
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unsigned long total = 0, reserved = 0, highmem = 0;
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struct zone *zone;
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printk("Mem-Info:\n");
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__show_free_areas(filter, nodemask, max_zone_idx);
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for_each_populated_zone(zone) {
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total += zone->present_pages;
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reserved += zone->present_pages - zone_managed_pages(zone);
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if (is_highmem(zone))
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highmem += zone->present_pages;
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}
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printk("%lu pages RAM\n", total);
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printk("%lu pages HighMem/MovableOnly\n", highmem);
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printk("%lu pages reserved\n", reserved);
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#ifdef CONFIG_CMA
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printk("%lu pages cma reserved\n", totalcma_pages);
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#endif
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#ifdef CONFIG_MEMORY_FAILURE
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printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
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#endif
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}
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