diff options
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r-- | mm/page_alloc.c | 438 |
1 files changed, 167 insertions, 271 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 9327a940e373..a9add06fe768 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -2951,7 +2951,7 @@ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, { long min = mark; int o; - const bool alloc_harder = (alloc_flags & ALLOC_HARDER); + const bool alloc_harder = (alloc_flags & (ALLOC_HARDER|ALLOC_OOM)); /* free_pages may go negative - that's OK */ free_pages -= (1 << order) - 1; @@ -2964,10 +2964,21 @@ bool __zone_watermark_ok(struct zone *z, unsigned int order, unsigned long mark, * the high-atomic reserves. This will over-estimate the size of the * atomic reserve but it avoids a search. */ - if (likely(!alloc_harder)) + if (likely(!alloc_harder)) { free_pages -= z->nr_reserved_highatomic; - else - min -= min / 4; + } else { + /* + * OOM victims can try even harder than normal ALLOC_HARDER + * users on the grounds that it's definitely going to be in + * the exit path shortly and free memory. Any allocation it + * makes during the free path will be small and short-lived. + */ + if (alloc_flags & ALLOC_OOM) + min -= min / 2; + else + min -= min / 4; + } + #ifdef CONFIG_CMA /* If allocation can't use CMA areas don't use free CMA pages */ @@ -3205,7 +3216,7 @@ static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask) * of allowed nodes. */ if (!(gfp_mask & __GFP_NOMEMALLOC)) - if (test_thread_flag(TIF_MEMDIE) || + if (tsk_is_oom_victim(current) || (current->flags & (PF_MEMALLOC | PF_EXITING))) filter &= ~SHOW_MEM_FILTER_NODES; if (in_interrupt() || !(gfp_mask & __GFP_DIRECT_RECLAIM)) @@ -3668,21 +3679,46 @@ gfp_to_alloc_flags(gfp_t gfp_mask) return alloc_flags; } -bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) +static bool oom_reserves_allowed(struct task_struct *tsk) { - if (unlikely(gfp_mask & __GFP_NOMEMALLOC)) + if (!tsk_is_oom_victim(tsk)) return false; + /* + * !MMU doesn't have oom reaper so give access to memory reserves + * only to the thread with TIF_MEMDIE set + */ + if (!IS_ENABLED(CONFIG_MMU) && !test_thread_flag(TIF_MEMDIE)) + return false; + + return true; +} + +/* + * Distinguish requests which really need access to full memory + * reserves from oom victims which can live with a portion of it + */ +static inline int __gfp_pfmemalloc_flags(gfp_t gfp_mask) +{ + if (unlikely(gfp_mask & __GFP_NOMEMALLOC)) + return 0; if (gfp_mask & __GFP_MEMALLOC) - return true; + return ALLOC_NO_WATERMARKS; if (in_serving_softirq() && (current->flags & PF_MEMALLOC)) - return true; - if (!in_interrupt() && - ((current->flags & PF_MEMALLOC) || - unlikely(test_thread_flag(TIF_MEMDIE)))) - return true; + return ALLOC_NO_WATERMARKS; + if (!in_interrupt()) { + if (current->flags & PF_MEMALLOC) + return ALLOC_NO_WATERMARKS; + else if (oom_reserves_allowed(current)) + return ALLOC_OOM; + } - return false; + return 0; +} + +bool gfp_pfmemalloc_allowed(gfp_t gfp_mask) +{ + return !!__gfp_pfmemalloc_flags(gfp_mask); } /* @@ -3835,6 +3871,7 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, unsigned long alloc_start = jiffies; unsigned int stall_timeout = 10 * HZ; unsigned int cpuset_mems_cookie; + int reserve_flags; /* * In the slowpath, we sanity check order to avoid ever trying to @@ -3940,15 +3977,16 @@ retry: if (gfp_mask & __GFP_KSWAPD_RECLAIM) wake_all_kswapds(order, ac); - if (gfp_pfmemalloc_allowed(gfp_mask)) - alloc_flags = ALLOC_NO_WATERMARKS; + reserve_flags = __gfp_pfmemalloc_flags(gfp_mask); + if (reserve_flags) + alloc_flags = reserve_flags; /* * Reset the zonelist iterators if memory policies can be ignored. * These allocations are high priority and system rather than user * orientated. */ - if (!(alloc_flags & ALLOC_CPUSET) || (alloc_flags & ALLOC_NO_WATERMARKS)) { + if (!(alloc_flags & ALLOC_CPUSET) || reserve_flags) { ac->zonelist = node_zonelist(numa_node_id(), gfp_mask); ac->preferred_zoneref = first_zones_zonelist(ac->zonelist, ac->high_zoneidx, ac->nodemask); @@ -4025,8 +4063,8 @@ retry: goto got_pg; /* Avoid allocations with no watermarks from looping endlessly */ - if (test_thread_flag(TIF_MEMDIE) && - (alloc_flags == ALLOC_NO_WATERMARKS || + if (tsk_is_oom_victim(current) && + (alloc_flags == ALLOC_OOM || (gfp_mask & __GFP_NOMEMALLOC))) goto nopage; @@ -4509,7 +4547,7 @@ long si_mem_available(void) * Estimate the amount of memory available for userspace allocations, * without causing swapping. */ - available = global_page_state(NR_FREE_PAGES) - totalreserve_pages; + available = global_zone_page_state(NR_FREE_PAGES) - totalreserve_pages; /* * Not all the page cache can be freed, otherwise the system will @@ -4538,7 +4576,7 @@ void si_meminfo(struct sysinfo *val) { val->totalram = totalram_pages; val->sharedram = global_node_page_state(NR_SHMEM); - val->freeram = global_page_state(NR_FREE_PAGES); + val->freeram = global_zone_page_state(NR_FREE_PAGES); val->bufferram = nr_blockdev_pages(); val->totalhigh = totalhigh_pages; val->freehigh = nr_free_highpages(); @@ -4673,11 +4711,11 @@ void show_free_areas(unsigned int filter, nodemask_t *nodemask) global_node_page_state(NR_SLAB_UNRECLAIMABLE), global_node_page_state(NR_FILE_MAPPED), global_node_page_state(NR_SHMEM), - global_page_state(NR_PAGETABLE), - global_page_state(NR_BOUNCE), - global_page_state(NR_FREE_PAGES), + global_zone_page_state(NR_PAGETABLE), + global_zone_page_state(NR_BOUNCE), + global_zone_page_state(NR_FREE_PAGES), free_pcp, - global_page_state(NR_FREE_CMA_PAGES)); + global_zone_page_state(NR_FREE_CMA_PAGES)); for_each_online_pgdat(pgdat) { if (show_mem_node_skip(filter, pgdat->node_id, nodemask)) @@ -4839,18 +4877,17 @@ 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) +static int build_zonerefs_node(pg_data_t *pgdat, struct zoneref *zonerefs) { struct zone *zone; enum zone_type zone_type = MAX_NR_ZONES; + int nr_zones = 0; do { zone_type--; zone = pgdat->node_zones + zone_type; if (managed_zone(zone)) { - zoneref_set_zone(zone, - &zonelist->_zonerefs[nr_zones++]); + zoneref_set_zone(zone, &zonerefs[nr_zones++]); check_highest_zone(zone_type); } } while (zone_type); @@ -4858,52 +4895,18 @@ static int build_zonelists_node(pg_data_t *pgdat, struct zonelist *zonelist, return nr_zones; } - -/* - * zonelist_order: - * 0 = automatic detection of better ordering. - * 1 = order by ([node] distance, -zonetype) - * 2 = order by (-zonetype, [node] distance) - * - * If not NUMA, ZONELIST_ORDER_ZONE and ZONELIST_ORDER_NODE will create - * the same zonelist. So only NUMA can configure this param. - */ -#define ZONELIST_ORDER_DEFAULT 0 -#define ZONELIST_ORDER_NODE 1 -#define ZONELIST_ORDER_ZONE 2 - -/* zonelist order in the kernel. - * set_zonelist_order() will set this to NODE or ZONE. - */ -static int current_zonelist_order = ZONELIST_ORDER_DEFAULT; -static char zonelist_order_name[3][8] = {"Default", "Node", "Zone"}; - - #ifdef CONFIG_NUMA -/* The value user specified ....changed by config */ -static int user_zonelist_order = ZONELIST_ORDER_DEFAULT; -/* string for sysctl */ -#define NUMA_ZONELIST_ORDER_LEN 16 -char numa_zonelist_order[16] = "default"; - -/* - * interface for configure zonelist ordering. - * command line option "numa_zonelist_order" - * = "[dD]efault - default, automatic configuration. - * = "[nN]ode - order by node locality, then by zone within node - * = "[zZ]one - order by zone, then by locality within zone - */ static int __parse_numa_zonelist_order(char *s) { - if (*s == 'd' || *s == 'D') { - user_zonelist_order = ZONELIST_ORDER_DEFAULT; - } else if (*s == 'n' || *s == 'N') { - user_zonelist_order = ZONELIST_ORDER_NODE; - } else if (*s == 'z' || *s == 'Z') { - user_zonelist_order = ZONELIST_ORDER_ZONE; - } else { - pr_warn("Ignoring invalid numa_zonelist_order value: %s\n", s); + /* + * We used to support different zonlists modes but they turned + * out to be just not useful. Let's keep the warning in place + * if somebody still use the cmd line parameter so that we do + * not fail it silently + */ + if (!(*s == 'd' || *s == 'D' || *s == 'n' || *s == 'N')) { + pr_warn("Ignoring unsupported numa_zonelist_order value: %s\n", s); return -EINVAL; } return 0; @@ -4911,19 +4914,15 @@ static int __parse_numa_zonelist_order(char *s) static __init int setup_numa_zonelist_order(char *s) { - int ret; - if (!s) return 0; - ret = __parse_numa_zonelist_order(s); - if (ret == 0) - strlcpy(numa_zonelist_order, s, NUMA_ZONELIST_ORDER_LEN); - - return ret; + return __parse_numa_zonelist_order(s); } early_param("numa_zonelist_order", setup_numa_zonelist_order); +char numa_zonelist_order[] = "Node"; + /* * sysctl handler for numa_zonelist_order */ @@ -4931,42 +4930,17 @@ int numa_zonelist_order_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { - char saved_string[NUMA_ZONELIST_ORDER_LEN]; + char *str; int ret; - static DEFINE_MUTEX(zl_order_mutex); - mutex_lock(&zl_order_mutex); - 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 (!write) + return proc_dostring(table, write, buffer, length, ppos); + str = memdup_user_nul(buffer, 16); + if (IS_ERR(str)) + return PTR_ERR(str); - ret = __parse_numa_zonelist_order((char *)table->data); - if (ret) { - /* - * bogus value. restore saved string - */ - strncpy((char *)table->data, saved_string, - NUMA_ZONELIST_ORDER_LEN); - user_zonelist_order = oldval; - } else if (oldval != user_zonelist_order) { - mem_hotplug_begin(); - mutex_lock(&zonelists_mutex); - build_all_zonelists(NULL, NULL); - mutex_unlock(&zonelists_mutex); - mem_hotplug_done(); - } - } -out: - mutex_unlock(&zl_order_mutex); + ret = __parse_numa_zonelist_order(str); + kfree(str); return ret; } @@ -5040,17 +5014,24 @@ static int find_next_best_node(int node, nodemask_t *used_node_mask) * This results in maximum locality--normal zone overflows into local * DMA zone, if any--but risks exhausting DMA zone. */ -static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) +static void build_zonelists_in_node_order(pg_data_t *pgdat, int *node_order, + unsigned nr_nodes) { - int j; - struct zonelist *zonelist; + struct zoneref *zonerefs; + int i; + + zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; + + for (i = 0; i < nr_nodes; i++) { + int nr_zones; - zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK]; - for (j = 0; zonelist->_zonerefs[j].zone != NULL; j++) - ; - j = build_zonelists_node(NODE_DATA(node), zonelist, j); - zonelist->_zonerefs[j].zone = NULL; - zonelist->_zonerefs[j].zone_idx = 0; + pg_data_t *node = NODE_DATA(node_order[i]); + + nr_zones = build_zonerefs_node(node, zonerefs); + zonerefs += nr_zones; + } + zonerefs->zone = NULL; + zonerefs->zone_idx = 0; } /* @@ -5058,13 +5039,14 @@ static void build_zonelists_in_node_order(pg_data_t *pgdat, int node) */ static void build_thisnode_zonelists(pg_data_t *pgdat) { - int j; - struct zonelist *zonelist; + struct zoneref *zonerefs; + int nr_zones; - zonelist = &pgdat->node_zonelists[ZONELIST_NOFALLBACK]; - j = build_zonelists_node(pgdat, zonelist, 0); - zonelist->_zonerefs[j].zone = NULL; - zonelist->_zonerefs[j].zone_idx = 0; + zonerefs = pgdat->node_zonelists[ZONELIST_NOFALLBACK]._zonerefs; + nr_zones = build_zonerefs_node(pgdat, zonerefs); + zonerefs += nr_zones; + zonerefs->zone = NULL; + zonerefs->zone_idx = 0; } /* @@ -5073,79 +5055,13 @@ static void build_thisnode_zonelists(pg_data_t *pgdat) * exhausted, but results in overflowing to remote node while memory * may still exist in local DMA zone. */ -static int node_order[MAX_NUMNODES]; - -static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes) -{ - int pos, j, node; - int zone_type; /* needs to be signed */ - struct zone *z; - struct zonelist *zonelist; - - zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK]; - pos = 0; - for (zone_type = MAX_NR_ZONES - 1; zone_type >= 0; zone_type--) { - for (j = 0; j < nr_nodes; j++) { - node = node_order[j]; - z = &NODE_DATA(node)->node_zones[zone_type]; - if (managed_zone(z)) { - zoneref_set_zone(z, - &zonelist->_zonerefs[pos++]); - check_highest_zone(zone_type); - } - } - } - zonelist->_zonerefs[pos].zone = NULL; - zonelist->_zonerefs[pos].zone_idx = 0; -} - -#if defined(CONFIG_64BIT) -/* - * Devices that require DMA32/DMA are relatively rare and do not justify a - * penalty to every machine in case the specialised case applies. Default - * to Node-ordering on 64-bit NUMA machines - */ -static int default_zonelist_order(void) -{ - return ZONELIST_ORDER_NODE; -} -#else -/* - * On 32-bit, the Normal zone needs to be preserved for allocations accessible - * by the kernel. If processes running on node 0 deplete the low memory zone - * then reclaim will occur more frequency increasing stalls and potentially - * be easier to OOM if a large percentage of the zone is under writeback or - * dirty. The problem is significantly worse if CONFIG_HIGHPTE is not set. - * Hence, default to zone ordering on 32-bit. - */ -static int default_zonelist_order(void) -{ - return ZONELIST_ORDER_ZONE; -} -#endif /* CONFIG_64BIT */ - -static void set_zonelist_order(void) -{ - if (user_zonelist_order == ZONELIST_ORDER_DEFAULT) - current_zonelist_order = default_zonelist_order(); - else - current_zonelist_order = user_zonelist_order; -} static void build_zonelists(pg_data_t *pgdat) { - int i, node, load; + static int node_order[MAX_NUMNODES]; + int node, load, nr_nodes = 0; nodemask_t used_mask; int local_node, prev_node; - struct zonelist *zonelist; - unsigned int order = current_zonelist_order; - - /* initialize zonelists */ - for (i = 0; i < MAX_ZONELISTS; i++) { - zonelist = pgdat->node_zonelists + i; - zonelist->_zonerefs[0].zone = NULL; - zonelist->_zonerefs[0].zone_idx = 0; - } /* NUMA-aware ordering of nodes */ local_node = pgdat->node_id; @@ -5154,8 +5070,6 @@ static void build_zonelists(pg_data_t *pgdat) nodes_clear(used_mask); memset(node_order, 0, sizeof(node_order)); - i = 0; - while ((node = find_next_best_node(local_node, &used_mask)) >= 0) { /* * We don't want to pressure a particular node. @@ -5166,19 +5080,12 @@ static void build_zonelists(pg_data_t *pgdat) node_distance(local_node, prev_node)) node_load[node] = load; + node_order[nr_nodes++] = node; prev_node = node; load--; - if (order == ZONELIST_ORDER_NODE) - build_zonelists_in_node_order(pgdat, node); - else - node_order[i++] = node; /* remember order */ - } - - if (order == ZONELIST_ORDER_ZONE) { - /* calculate node order -- i.e., DMA last! */ - build_zonelists_in_zone_order(pgdat, i); } + build_zonelists_in_node_order(pgdat, node_order, nr_nodes); build_thisnode_zonelists(pgdat); } @@ -5204,21 +5111,17 @@ static void setup_min_unmapped_ratio(void); static void setup_min_slab_ratio(void); #else /* CONFIG_NUMA */ -static void set_zonelist_order(void) -{ - current_zonelist_order = ZONELIST_ORDER_ZONE; -} - static void build_zonelists(pg_data_t *pgdat) { int node, local_node; - enum zone_type j; - struct zonelist *zonelist; + struct zoneref *zonerefs; + int nr_zones; local_node = pgdat->node_id; - zonelist = &pgdat->node_zonelists[ZONELIST_FALLBACK]; - j = build_zonelists_node(pgdat, zonelist, 0); + zonerefs = pgdat->node_zonelists[ZONELIST_FALLBACK]._zonerefs; + nr_zones = build_zonerefs_node(pgdat, zonerefs); + zonerefs += nr_zones; /* * Now we build the zonelist so that it contains the zones @@ -5231,16 +5134,18 @@ 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); + nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); + zonerefs += nr_zones; } for (node = 0; node < local_node; node++) { if (!node_online(node)) continue; - j = build_zonelists_node(NODE_DATA(node), zonelist, j); + nr_zones = build_zonerefs_node(NODE_DATA(node), zonerefs); + zonerefs += nr_zones; } - zonelist->_zonerefs[j].zone = NULL; - zonelist->_zonerefs[j].zone_idx = 0; + zonerefs->zone = NULL; + zonerefs->zone_idx = 0; } #endif /* CONFIG_NUMA */ @@ -5263,50 +5168,32 @@ static void build_zonelists(pg_data_t *pgdat) static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch); static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset); static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats); -static void setup_zone_pageset(struct zone *zone); - -/* - * Global mutex to protect against size modification of zonelists - * as well as to serialize pageset setup for the new populated zone. - */ -DEFINE_MUTEX(zonelists_mutex); -/* return values int ....just for stop_machine() */ -static int __build_all_zonelists(void *data) +static void __build_all_zonelists(void *data) { int nid; - int cpu; + int __maybe_unused cpu; pg_data_t *self = data; + static DEFINE_SPINLOCK(lock); + + spin_lock(&lock); #ifdef CONFIG_NUMA memset(node_load, 0, sizeof(node_load)); #endif + /* + * This node is hotadded and no memory is yet present. So just + * building zonelists is fine - no need to touch other nodes. + */ if (self && !node_online(self->node_id)) { build_zonelists(self); - } - - for_each_online_node(nid) { - pg_data_t *pgdat = NODE_DATA(nid); - - build_zonelists(pgdat); - } + } else { + for_each_online_node(nid) { + pg_data_t *pgdat = NODE_DATA(nid); - /* - * Initialize the boot_pagesets that are going to be used - * for bootstrapping processors. The real pagesets for - * each zone will be allocated later when the per cpu - * allocator is available. - * - * boot_pagesets are used also for bootstrapping offline - * cpus if the system is already booted because the pagesets - * are needed to initialize allocators on a specific cpu too. - * F.e. the percpu allocator needs the page allocator which - * needs the percpu allocator in order to allocate its pagesets - * (a chicken-egg dilemma). - */ - for_each_possible_cpu(cpu) { - setup_pageset(&per_cpu(boot_pageset, cpu), 0); + build_zonelists(pgdat); + } #ifdef CONFIG_HAVE_MEMORYLESS_NODES /* @@ -5317,45 +5204,53 @@ static int __build_all_zonelists(void *data) * secondary cpus' numa_mem as they come on-line. During * node/memory hotplug, we'll fixup all on-line cpus. */ - if (cpu_online(cpu)) + for_each_online_cpu(cpu) set_cpu_numa_mem(cpu, local_memory_node(cpu_to_node(cpu))); #endif } - return 0; + spin_unlock(&lock); } static noinline void __init build_all_zonelists_init(void) { + int cpu; + __build_all_zonelists(NULL); + + /* + * Initialize the boot_pagesets that are going to be used + * for bootstrapping processors. The real pagesets for + * each zone will be allocated later when the per cpu + * allocator is available. + * + * boot_pagesets are used also for bootstrapping offline + * cpus if the system is already booted because the pagesets + * are needed to initialize allocators on a specific cpu too. + * F.e. the percpu allocator needs the page allocator which + * needs the percpu allocator in order to allocate its pagesets + * (a chicken-egg dilemma). + */ + for_each_possible_cpu(cpu) + setup_pageset(&per_cpu(boot_pageset, cpu), 0); + mminit_verify_zonelist(); cpuset_init_current_mems_allowed(); } /* - * Called with zonelists_mutex held always * unless system_state == SYSTEM_BOOTING. * - * __ref due to (1) call of __meminit annotated setup_zone_pageset - * [we're only called with non-NULL zone through __meminit paths] and - * (2) call of __init annotated helper build_all_zonelists_init + * __ref due to call of __init annotated helper build_all_zonelists_init * [protected by SYSTEM_BOOTING]. */ -void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) +void __ref build_all_zonelists(pg_data_t *pgdat) { - set_zonelist_order(); - if (system_state == SYSTEM_BOOTING) { build_all_zonelists_init(); } else { -#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_cpuslocked(__build_all_zonelists, pgdat, NULL); + __build_all_zonelists(pgdat); /* cpuset refresh routine should be here */ } vm_total_pages = nr_free_pagecache_pages(); @@ -5371,9 +5266,8 @@ void __ref build_all_zonelists(pg_data_t *pgdat, struct zone *zone) else page_group_by_mobility_disabled = 0; - pr_info("Built %i zonelists in %s order, mobility grouping %s. Total pages: %ld\n", + pr_info("Built %i zonelists, mobility grouping %s. Total pages: %ld\n", nr_online_nodes, - zonelist_order_name[current_zonelist_order], page_group_by_mobility_disabled ? "off" : "on", vm_total_pages); #ifdef CONFIG_NUMA @@ -5627,7 +5521,7 @@ static void __meminit zone_pageset_init(struct zone *zone, int cpu) pageset_set_high_and_batch(zone, pcp); } -static void __meminit setup_zone_pageset(struct zone *zone) +void __meminit setup_zone_pageset(struct zone *zone) { int cpu; zone->pageset = alloc_percpu(struct per_cpu_pageset); @@ -7081,9 +6975,11 @@ static void __setup_per_zone_wmarks(void) */ void setup_per_zone_wmarks(void) { - mutex_lock(&zonelists_mutex); + static DEFINE_SPINLOCK(lock); + + spin_lock(&lock); __setup_per_zone_wmarks(); - mutex_unlock(&zonelists_mutex); + spin_unlock(&lock); } /* |