diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 384 |
1 files changed, 260 insertions, 124 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c3edb62..b100255 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -61,10 +61,14 @@ #include <linux/hugetlb.h> #include <linux/sched/rt.h> +#include <asm/sections.h> #include <asm/tlbflush.h> #include <asm/div64.h> #include "internal.h" +/* prevent >1 _updater_ of zone percpu pageset ->high and ->batch fields */ +static DEFINE_MUTEX(pcp_batch_high_lock); + #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID DEFINE_PER_CPU(int, numa_node); EXPORT_PER_CPU_SYMBOL(numa_node); @@ -100,6 +104,9 @@ nodemask_t node_states[NR_NODE_STATES] __read_mostly = { }; EXPORT_SYMBOL(node_states); +/* Protect totalram_pages and zone->managed_pages */ +static DEFINE_SPINLOCK(managed_page_count_lock); + unsigned long totalram_pages __read_mostly; unsigned long totalreserve_pages __read_mostly; /* @@ -197,6 +204,7 @@ static char * const zone_names[MAX_NR_ZONES] = { }; int min_free_kbytes = 1024; +int user_min_free_kbytes; static unsigned long __meminitdata nr_kernel_pages; static unsigned long __meminitdata nr_all_pages; @@ -739,14 +747,7 @@ static void __free_pages_ok(struct page *page, unsigned int order) local_irq_restore(flags); } -/* - * Read access to zone->managed_pages is safe because it's unsigned long, - * but we still need to serialize writers. Currently all callers of - * __free_pages_bootmem() except put_page_bootmem() should only be used - * at boot time. So for shorter boot time, we shift the burden to - * put_page_bootmem() to serialize writers. - */ -void __meminit __free_pages_bootmem(struct page *page, unsigned int order) +void __init __free_pages_bootmem(struct page *page, unsigned int order) { unsigned int nr_pages = 1 << order; unsigned int loop; @@ -781,11 +782,7 @@ void __init init_cma_reserved_pageblock(struct page *page) set_page_refcounted(page); set_pageblock_migratetype(page, MIGRATE_CMA); __free_pages(page, pageblock_order); - totalram_pages += pageblock_nr_pages; -#ifdef CONFIG_HIGHMEM - if (PageHighMem(page)) - totalhigh_pages += pageblock_nr_pages; -#endif + adjust_managed_page_count(page, pageblock_nr_pages); } #endif @@ -1050,7 +1047,7 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype) * MIGRATE_CMA areas. */ if (!is_migrate_cma(migratetype) && - (unlikely(current_order >= pageblock_order / 2) || + (current_order >= pageblock_order / 2 || start_migratetype == MIGRATE_RECLAIMABLE || page_group_by_mobility_disabled)) { int pages; @@ -1179,10 +1176,12 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) { unsigned long flags; int to_drain; + unsigned long batch; local_irq_save(flags); - if (pcp->count >= pcp->batch) - to_drain = pcp->batch; + batch = ACCESS_ONCE(pcp->batch); + if (pcp->count >= batch) + to_drain = batch; else to_drain = pcp->count; if (to_drain > 0) { @@ -1350,8 +1349,9 @@ void free_hot_cold_page(struct page *page, int cold) list_add(&page->lru, &pcp->lists[migratetype]); pcp->count++; if (pcp->count >= pcp->high) { - free_pcppages_bulk(zone, pcp->batch, pcp); - pcp->count -= pcp->batch; + unsigned long batch = ACCESS_ONCE(pcp->batch); + free_pcppages_bulk(zone, batch, pcp); + pcp->count -= batch; } out: @@ -2839,7 +2839,7 @@ EXPORT_SYMBOL(free_pages_exact); * nr_free_zone_pages() counts the number of counts pages which are beyond the * high watermark within all zones at or below a given zone index. For each * zone, the number of pages is calculated as: - * present_pages - high_pages + * managed_pages - high_pages */ static unsigned long nr_free_zone_pages(int offset) { @@ -2906,9 +2906,13 @@ EXPORT_SYMBOL(si_meminfo); #ifdef CONFIG_NUMA void si_meminfo_node(struct sysinfo *val, int nid) { + int zone_type; /* needs to be signed */ + unsigned long managed_pages = 0; pg_data_t *pgdat = NODE_DATA(nid); - val->totalram = pgdat->node_present_pages; + for (zone_type = 0; zone_type < MAX_NR_ZONES; zone_type++) + managed_pages += pgdat->node_zones[zone_type].managed_pages; + val->totalram = managed_pages; val->freeram = node_page_state(nid, NR_FREE_PAGES); #ifdef CONFIG_HIGHMEM val->totalhigh = pgdat->node_zones[ZONE_HIGHMEM].managed_pages; @@ -3150,12 +3154,10 @@ static void zoneref_set_zone(struct zone *zone, struct zoneref *zoneref) * Add all populated zones of a node to the zonelist. */ static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, - int nr_zones, enum zone_type zone_type) + int nr_zones) { struct zone *zone; - - BUG_ON(zone_type >= MAX_NR_ZONES); - zone_type++; + enum zone_type zone_type = MAX_NR_ZONES; do { zone_type--; @@ -3165,8 +3167,8 @@ static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, &zonelist->_zonerefs[nr_zones++]); check_highest_zone(zone_type); } - } while (zone_type); + return nr_zones; } @@ -3250,18 +3252,25 @@ int numa_zonelist_order_handler(ctl_table *table, int write, static DEFINE_MUTEX(zl_order_mutex); mutex_lock(&zl_order_mutex); - if (write) - strcpy(saved_string, (char*)table->data); + if (write) { + if (strlen((char *)table->data) >= NUMA_ZONELIST_ORDER_LEN) { + ret = -EINVAL; + goto out; + } + strcpy(saved_string, (char *)table->data); + } ret = proc_dostring(table, write, buffer, length, ppos); if (ret) goto out; if (write) { int oldval = user_zonelist_order; - if (__parse_numa_zonelist_order((char*)table->data)) { + + ret = __parse_numa_zonelist_order((char *)table->data); + if (ret) { /* * bogus value. restore saved string */ - strncpy((char*)table->data, saved_string, + strncpy((char *)table->data, saved_string, NUMA_ZONELIST_ORDER_LEN); user_zonelist_order = oldval; } else if (oldval != user_zonelist_order) { @@ -3353,8 +3362,7 @@ static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) zonelist = &pgdat->node_zonelists[0]; for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) ; - j = build_zonelists_node(NODE_DATA(node), zonelist, j, - MAX_NR_ZONES - 1); + j = build_zonelists_node(NODE_DATA(node), zonelist, j); zonelist->_zonerefs[j].zone = NULL; zonelist->_zonerefs[j].zone_idx = 0; } @@ -3368,7 +3376,7 @@ static void build_thisnode_zonelists(pg_data_t *pgdat) struct zonelist *zonelist; zonelist = &pgdat->node_zonelists[1]; - j = build_zonelists_node(pgdat, zonelist, 0, MAX_NR_ZONES - 1); + j = build_zonelists_node(pgdat, zonelist, 0); zonelist->_zonerefs[j].zone = NULL; zonelist->_zonerefs[j].zone_idx = 0; } @@ -3425,8 +3433,8 @@ static int default_zonelist_order(void) z = &NODE_DATA(nid)->node_zones[zone_type]; if (populated_zone(z)) { if (zone_type < ZONE_NORMAL) - low_kmem_size += z->present_pages; - total_size += z->present_pages; + low_kmem_size += z->managed_pages; + total_size += z->managed_pages; } else if (zone_type == ZONE_NORMAL) { /* * If any node has only lowmem, then node order @@ -3576,7 +3584,7 @@ static void build_zonelists(pg_data_t *pgdat) local_node = pgdat->node_id; zonelist = &pgdat->node_zonelists[0]; - j = build_zonelists_node(pgdat, zonelist, 0, MAX_NR_ZONES - 1); + j = build_zonelists_node(pgdat, zonelist, 0); /* * Now we build the zonelist so that it contains the zones @@ -3589,14 +3597,12 @@ static void build_zonelists(pg_data_t *pgdat) for (node = local_node + 1; node < MAX_NUMNODES; node++) { if (!node_online(node)) continue; - j = build_zonelists_node(NODE_DATA(node), zonelist, j, - MAX_NR_ZONES - 1); + j = build_zonelists_node(NODE_DATA(node), zonelist, j); } for (node = 0; node < local_node; node++) { if (!node_online(node)) continue; - j = build_zonelists_node(NODE_DATA(node), zonelist, j, - MAX_NR_ZONES - 1); + j = build_zonelists_node(NODE_DATA(node), zonelist, j); } zonelist->_zonerefs[j].zone = NULL; @@ -3705,12 +3711,12 @@ void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) mminit_verify_zonelist(); cpuset_init_current_mems_allowed(); } else { - /* we have to stop all cpus to guarantee there is no user - of zonelist */ #ifdef CONFIG_MEMORY_HOTPLUG if (zone) setup_zone_pageset(zone); #endif + /* we have to stop all cpus to guarantee there is no user + of zonelist */ stop_machine(__build_all_zonelists, pgdat, NULL); /* cpuset refresh routine should be here */ } @@ -4032,7 +4038,40 @@ static int __meminit zone_batchsize(struct zone *zone) #endif } -static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) +/* + * pcp->high and pcp->batch values are related and dependent on one another: + * ->batch must never be higher then ->high. + * The following function updates them in a safe manner without read side + * locking. + * + * Any new users of pcp->batch and pcp->high should ensure they can cope with + * those fields changing asynchronously (acording the the above rule). + * + * mutex_is_locked(&pcp_batch_high_lock) required when calling this function + * outside of boot time (or some other assurance that no concurrent updaters + * exist). + */ +static void pageset_update(struct per_cpu_pages *pcp, unsigned long high, + unsigned long batch) +{ + /* start with a fail safe value for batch */ + pcp->batch = 1; + smp_wmb(); + + /* Update high, then batch, in order */ + pcp->high = high; + smp_wmb(); + + pcp->batch = batch; +} + +/* a companion to pageset_set_high() */ +static void pageset_set_batch(struct per_cpu_pageset *p, unsigned long batch) +{ + pageset_update(&p->pcp, 6 * batch, max(1UL, 1 * batch)); +} + +static void pageset_init(struct per_cpu_pageset *p) { struct per_cpu_pages *pcp; int migratetype; @@ -4041,45 +4080,55 @@ static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) pcp = &p->pcp; pcp->count = 0; - pcp->high = 6 * batch; - pcp->batch = max(1UL, 1 * batch); for (migratetype = 0; migratetype < MIGRATE_PCPTYPES; migratetype++) INIT_LIST_HEAD(&pcp->lists[migratetype]); } +static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch) +{ + pageset_init(p); + pageset_set_batch(p, batch); +} + /* - * setup_pagelist_highmark() sets the high water mark for hot per_cpu_pagelist + * pageset_set_high() sets the high water mark for hot per_cpu_pagelist * to the value high for the pageset p. */ - -static void setup_pagelist_highmark(struct per_cpu_pageset *p, +static void pageset_set_high(struct per_cpu_pageset *p, unsigned long high) { - struct per_cpu_pages *pcp; + unsigned long batch = max(1UL, high / 4); + if ((high / 4) > (PAGE_SHIFT * 8)) + batch = PAGE_SHIFT * 8; - pcp = &p->pcp; - pcp->high = high; - pcp->batch = max(1UL, high/4); - if ((high/4) > (PAGE_SHIFT * 8)) - pcp->batch = PAGE_SHIFT * 8; + pageset_update(&p->pcp, high, batch); } -static void __meminit setup_zone_pageset(struct zone *zone) +static void __meminit pageset_set_high_and_batch(struct zone *zone, + struct per_cpu_pageset *pcp) { - int cpu; - - zone->pageset = alloc_percpu(struct per_cpu_pageset); + if (percpu_pagelist_fraction) + pageset_set_high(pcp, + (zone->managed_pages / + percpu_pagelist_fraction)); + else + pageset_set_batch(pcp, zone_batchsize(zone)); +} - for_each_possible_cpu(cpu) { - struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); +static void __meminit zone_pageset_init(struct zone *zone, int cpu) +{ + struct per_cpu_pageset *pcp = per_cpu_ptr(zone->pageset, cpu); - setup_pageset(pcp, zone_batchsize(zone)); + pageset_init(pcp); + pageset_set_high_and_batch(zone, pcp); +} - if (percpu_pagelist_fraction) - setup_pagelist_highmark(pcp, - (zone->managed_pages / - percpu_pagelist_fraction)); - } +static void __meminit setup_zone_pageset(struct zone *zone) +{ + int cpu; + zone->pageset = alloc_percpu(struct per_cpu_pageset); + for_each_possible_cpu(cpu) + zone_pageset_init(zone, cpu); } /* @@ -4368,13 +4417,13 @@ static void __meminit adjust_zone_range_for_zone_movable(int nid, */ static unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, + unsigned long node_start_pfn, + unsigned long node_end_pfn, unsigned long *ignored) { - unsigned long node_start_pfn, node_end_pfn; unsigned long zone_start_pfn, zone_end_pfn; - /* Get the start and end of the node and zone */ - get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); + /* Get the start and end of the zone */ zone_start_pfn = arch_zone_lowest_possible_pfn[zone_type]; zone_end_pfn = arch_zone_highest_possible_pfn[zone_type]; adjust_zone_range_for_zone_movable(nid, zone_type, @@ -4429,14 +4478,14 @@ unsigned long __init absent_pages_in_range(unsigned long start_pfn, /* Return the number of page frames in holes in a zone on a node */ static unsigned long __meminit zone_absent_pages_in_node(int nid, unsigned long zone_type, + unsigned long node_start_pfn, + unsigned long node_end_pfn, unsigned long *ignored) { unsigned long zone_low = arch_zone_lowest_possible_pfn[zone_type]; unsigned long zone_high = arch_zone_highest_possible_pfn[zone_type]; - unsigned long node_start_pfn, node_end_pfn; unsigned long zone_start_pfn, zone_end_pfn; - get_pfn_range_for_nid(nid, &node_start_pfn, &node_end_pfn); zone_start_pfn = clamp(node_start_pfn, zone_low, zone_high); zone_end_pfn = clamp(node_end_pfn, zone_low, zone_high); @@ -4449,6 +4498,8 @@ static unsigned long __meminit zone_absent_pages_in_node(int nid, #else /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, unsigned long zone_type, + unsigned long node_start_pfn, + unsigned long node_end_pfn, unsigned long *zones_size) { return zones_size[zone_type]; @@ -4456,6 +4507,8 @@ static inline unsigned long __meminit zone_spanned_pages_in_node(int nid, static inline unsigned long __meminit zone_absent_pages_in_node(int nid, unsigned long zone_type, + unsigned long node_start_pfn, + unsigned long node_end_pfn, unsigned long *zholes_size) { if (!zholes_size) @@ -4467,21 +4520,27 @@ static inline unsigned long __meminit zone_absent_pages_in_node(int nid, #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ static void __meminit calculate_node_totalpages(struct pglist_data *pgdat, - unsigned long *zones_size, unsigned long *zholes_size) + unsigned long node_start_pfn, + unsigned long node_end_pfn, + unsigned long *zones_size, + unsigned long *zholes_size) { unsigned long realtotalpages, totalpages = 0; enum zone_type i; for (i = 0; i < MAX_NR_ZONES; i++) totalpages += zone_spanned_pages_in_node(pgdat->node_id, i, - zones_size); + node_start_pfn, + node_end_pfn, + zones_size); pgdat->node_spanned_pages = totalpages; realtotalpages = totalpages; for (i = 0; i < MAX_NR_ZONES; i++) realtotalpages -= zone_absent_pages_in_node(pgdat->node_id, i, - zholes_size); + node_start_pfn, node_end_pfn, + zholes_size); pgdat->node_present_pages = realtotalpages; printk(KERN_DEBUG "On node %d totalpages: %lu\n", pgdat->node_id, realtotalpages); @@ -4590,6 +4649,7 @@ static unsigned long __paginginit calc_memmap_size(unsigned long spanned_pages, * NOTE: pgdat should get zeroed by caller. */ static void __paginginit free_area_init_core(struct pglist_data *pgdat, + unsigned long node_start_pfn, unsigned long node_end_pfn, unsigned long *zones_size, unsigned long *zholes_size) { enum zone_type j; @@ -4611,8 +4671,11 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat, struct zone *zone = pgdat->node_zones + j; unsigned long size, realsize, freesize, memmap_pages; - size = zone_spanned_pages_in_node(nid, j, zones_size); + size = zone_spanned_pages_in_node(nid, j, node_start_pfn, + node_end_pfn, zones_size); realsize = freesize = size - zone_absent_pages_in_node(nid, j, + node_start_pfn, + node_end_pfn, zholes_size); /* @@ -4726,6 +4789,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, unsigned long node_start_pfn, unsigned long *zholes_size) { pg_data_t *pgdat = NODE_DATA(nid); + unsigned long start_pfn = 0; + unsigned long end_pfn = 0; /* pg_data_t should be reset to zero when it's allocated */ WARN_ON(pgdat->nr_zones || pgdat->classzone_idx); @@ -4733,7 +4798,11 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, pgdat->node_id = nid; pgdat->node_start_pfn = node_start_pfn; init_zone_allows_reclaim(nid); - calculate_node_totalpages(pgdat, zones_size, zholes_size); +#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP + get_pfn_range_for_nid(nid, &start_pfn, &end_pfn); +#endif + calculate_node_totalpages(pgdat, start_pfn, end_pfn, + zones_size, zholes_size); alloc_node_mem_map(pgdat); #ifdef CONFIG_FLAT_NODE_MEM_MAP @@ -4742,7 +4811,8 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size, (unsigned long)pgdat->node_mem_map); #endif - free_area_init_core(pgdat, zones_size, zholes_size); + free_area_init_core(pgdat, start_pfn, end_pfn, + zones_size, zholes_size); } #ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP @@ -5150,35 +5220,101 @@ early_param("movablecore", cmdline_parse_movablecore); #endif /* CONFIG_HAVE_MEMBLOCK_NODE_MAP */ -unsigned long free_reserved_area(unsigned long start, unsigned long end, - int poison, char *s) +void adjust_managed_page_count(struct page *page, long count) { - unsigned long pages, pos; + spin_lock(&managed_page_count_lock); + page_zone(page)->managed_pages += count; + totalram_pages += count; +#ifdef CONFIG_HIGHMEM + if (PageHighMem(page)) + totalhigh_pages += count; +#endif + spin_unlock(&managed_page_count_lock); +} +EXPORT_SYMBOL(adjust_managed_page_count); - pos = start = PAGE_ALIGN(start); - end &= PAGE_MASK; - for (pages = 0; pos < end; pos += PAGE_SIZE, pages++) { - if (poison) - memset((void *)pos, poison, PAGE_SIZE); - free_reserved_page(virt_to_page((void *)pos)); +unsigned long free_reserved_area(void *start, void *end, int poison, char *s) +{ + void *pos; + unsigned long pages = 0; + + start = (void *)PAGE_ALIGN((unsigned long)start); + end = (void *)((unsigned long)end & PAGE_MASK); + for (pos = start; pos < end; pos += PAGE_SIZE, pages++) { + if ((unsigned int)poison <= 0xFF) + memset(pos, poison, PAGE_SIZE); + free_reserved_page(virt_to_page(pos)); } if (pages && s) - pr_info("Freeing %s memory: %ldK (%lx - %lx)\n", + pr_info("Freeing %s memory: %ldK (%p - %p)\n", s, pages << (PAGE_SHIFT - 10), start, end); return pages; } +EXPORT_SYMBOL(free_reserved_area); #ifdef CONFIG_HIGHMEM void free_highmem_page(struct page *page) { __free_reserved_page(page); totalram_pages++; + page_zone(page)->managed_pages++; totalhigh_pages++; } #endif + +void __init mem_init_print_info(const char *str) +{ + unsigned long physpages, codesize, datasize, rosize, bss_size; + unsigned long init_code_size, init_data_size; + + physpages = get_num_physpages(); + codesize = _etext - _stext; + datasize = _edata - _sdata; + rosize = __end_rodata - __start_rodata; + bss_size = __bss_stop - __bss_start; + init_data_size = __init_end - __init_begin; + init_code_size = _einittext - _sinittext; + + /* + * Detect special cases and adjust section sizes accordingly: + * 1) .init.* may be embedded into .data sections + * 2) .init.text.* may be out of [__init_begin, __init_end], + * please refer to arch/tile/kernel/vmlinux.lds.S. + * 3) .rodata.* may be embedded into .text or .data sections. + */ +#define adj_init_size(start, end, size, pos, adj) \ + if (start <= pos && pos < end && size > adj) \ + size -= adj; + + adj_init_size(__init_begin, __init_end, init_data_size, + _sinittext, init_code_size); + adj_init_size(_stext, _etext, codesize, _sinittext, init_code_size); + adj_init_size(_sdata, _edata, datasize, __init_begin, init_data_size); + adj_init_size(_stext, _etext, codesize, __start_rodata, rosize); + adj_init_size(_sdata, _edata, datasize, __start_rodata, rosize); + +#undef adj_init_size + + printk("Memory: %luK/%luK available " + "(%luK kernel code, %luK rwdata, %luK rodata, " + "%luK init, %luK bss, %luK reserved" +#ifdef CONFIG_HIGHMEM + ", %luK highmem" +#endif + "%s%s)\n", + nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10), + codesize >> 10, datasize >> 10, rosize >> 10, + (init_data_size + init_code_size) >> 10, bss_size >> 10, + (physpages - totalram_pages) << (PAGE_SHIFT-10), +#ifdef CONFIG_HIGHMEM + totalhigh_pages << (PAGE_SHIFT-10), +#endif + str ? ", " : "", str ? str : ""); +} + /** * set_dma_reserve - set the specified number of pages reserved in the first zone * @new_dma_reserve: The number of pages to mark reserved @@ -5454,14 +5590,21 @@ static void __meminit setup_per_zone_inactive_ratio(void) int __meminit init_per_zone_wmark_min(void) { unsigned long lowmem_kbytes; + int new_min_free_kbytes; lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10); - - min_free_kbytes = int_sqrt(lowmem_kbytes * 16); - if (min_free_kbytes < 128) - min_free_kbytes = 128; - if (min_free_kbytes > 65536) - min_free_kbytes = 65536; + new_min_free_kbytes = int_sqrt(lowmem_kbytes * 16); + + if (new_min_free_kbytes > user_min_free_kbytes) { + min_free_kbytes = new_min_free_kbytes; + if (min_free_kbytes < 128) + min_free_kbytes = 128; + if (min_free_kbytes > 65536) + min_free_kbytes = 65536; + } else { + pr_warn("min_free_kbytes is not updated to %d because user defined value %d is preferred\n", + new_min_free_kbytes, user_min_free_kbytes); + } setup_per_zone_wmarks(); refresh_zone_stat_thresholds(); setup_per_zone_lowmem_reserve(); @@ -5479,8 +5622,10 @@ int min_free_kbytes_sysctl_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { proc_dointvec(table, write, buffer, length, ppos); - if (write) + if (write) { + user_min_free_kbytes = min_free_kbytes; setup_per_zone_wmarks(); + } return 0; } @@ -5540,7 +5685,6 @@ int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write, * cpu. It is the fraction of total pages in each zone that a hot per cpu pagelist * can have before it gets flushed back to buddy allocator. */ - int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { @@ -5551,14 +5695,16 @@ int percpu_pagelist_fraction_sysctl_handler(ctl_table *table, int write, ret = proc_dointvec_minmax(table, write, buffer, length, ppos); if (!write || (ret < 0)) return ret; + + mutex_lock(&pcp_batch_high_lock); for_each_populated_zone(zone) { - for_each_possible_cpu(cpu) { - unsigned long high; - high = zone->managed_pages / percpu_pagelist_fraction; - setup_pagelist_highmark( - per_cpu_ptr(zone->pageset, cpu), high); - } + unsigned long high; + high = zone->managed_pages / percpu_pagelist_fraction; + for_each_possible_cpu(cpu) + pageset_set_high(per_cpu_ptr(zone->pageset, cpu), + high); } + mutex_unlock(&pcp_batch_high_lock); return 0; } @@ -6047,32 +6193,18 @@ void free_contig_range(unsigned long pfn, unsigned nr_pages) #endif #ifdef CONFIG_MEMORY_HOTPLUG -static int __meminit __zone_pcp_update(void *data) -{ - struct zone *zone = data; - int cpu; - unsigned long batch = zone_batchsize(zone), flags; - - for_each_possible_cpu(cpu) { - struct per_cpu_pageset *pset; - struct per_cpu_pages *pcp; - - pset = per_cpu_ptr(zone->pageset, cpu); - pcp = &pset->pcp; - - local_irq_save(flags); - if (pcp->count > 0) - free_pcppages_bulk(zone, pcp->count, pcp); - drain_zonestat(zone, pset); - setup_pageset(pset, batch); - local_irq_restore(flags); - } - return 0; -} - +/* + * The zone indicated has a new number of managed_pages; batch sizes and percpu + * page high values need to be recalulated. + */ void __meminit zone_pcp_update(struct zone *zone) { - stop_machine(__zone_pcp_update, zone, NULL); + unsigned cpu; + mutex_lock(&pcp_batch_high_lock); + for_each_possible_cpu(cpu) + pageset_set_high_and_batch(zone, + per_cpu_ptr(zone->pageset, cpu)); + mutex_unlock(&pcp_batch_high_lock); } #endif @@ -6142,6 +6274,10 @@ __offline_isolated_pages(unsigned long start_pfn, unsigned long end_pfn) list_del(&page->lru); rmv_page_order(page); zone->free_area[order].nr_free--; +#ifdef CONFIG_HIGHMEM + if (PageHighMem(page)) + totalhigh_pages -= 1 << order; +#endif for (i = 0; i < (1 << order); i++) SetPageReserved((page+i)); pfn += (1 << order); |
