#include <linux/topology.h>
#include <linux/sysctl.h>
#include <linux/cpu.h>
-#include <linux/vs_base.h>
+#include <linux/nodemask.h>
+#include <linux/vmalloc.h>
#include <linux/vs_limit.h>
#include <asm/tlbflush.h>
+#include "internal.h"
-DECLARE_BITMAP(node_online_map, MAX_NUMNODES);
+/* MCD - HACK: Find somewhere to initialize this EARLY, or make this initializer cleaner */
+nodemask_t node_online_map = { { [0] = 1UL } };
+nodemask_t node_possible_map = NODE_MASK_ALL;
struct pglist_data *pgdat_list;
unsigned long totalram_pages;
unsigned long totalhigh_pages;
long nr_swap_pages;
-int numnodes = 1;
-int sysctl_lower_zone_protection = 0;
+/*
+ * results with 256, 32 in the lowmem_reserve sysctl:
+ * 1G machine -> (16M dma, 800M-16M normal, 1G-800M high)
+ * 1G machine -> (16M dma, 784M normal, 224M high)
+ * NORMAL allocation will leave 784M/256 of ram reserved in the ZONE_DMA
+ * HIGHMEM allocation will leave 224M/32 of ram reserved in ZONE_NORMAL
+ * HIGHMEM allocation will (224M+784M)/256 of ram reserved in ZONE_DMA
+ */
+int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = { 256, 32 };
EXPORT_SYMBOL(totalram_pages);
EXPORT_SYMBOL(nr_swap_pages);
return 1;
if (page_to_pfn(page) < zone->zone_start_pfn)
return 1;
+#ifdef CONFIG_HOLES_IN_ZONE
+ if (!pfn_valid(page_to_pfn(page)))
+ return 1;
+#endif
if (zone != page_zone(page))
return 1;
return 0;
set_page_count(page, 0);
reset_page_mapcount(page);
page->mapping = NULL;
+ tainted |= TAINT_BAD_PAGE;
}
#ifndef CONFIG_HUGETLB_PAGE
}
#endif /* CONFIG_HUGETLB_PAGE */
+/*
+ * function for dealing with page's order in buddy system.
+ * zone->lock is already acquired when we use these.
+ * So, we don't need atomic page->flags operations here.
+ */
+static inline unsigned long page_order(struct page *page) {
+ return page->private;
+}
+
+static inline void set_page_order(struct page *page, int order) {
+ page->private = order;
+ __SetPagePrivate(page);
+}
+
+static inline void rmv_page_order(struct page *page)
+{
+ __ClearPagePrivate(page);
+ page->private = 0;
+}
+
+/*
+ * This function checks whether a page is free && is the buddy
+ * we can do coalesce a page and its buddy if
+ * (a) the buddy is free &&
+ * (b) the buddy is on the buddy system &&
+ * (c) a page and its buddy have the same order.
+ * for recording page's order, we use page->private and PG_private.
+ *
+ */
+static inline int page_is_buddy(struct page *page, int order)
+{
+ if (PagePrivate(page) &&
+ (page_order(page) == order) &&
+ !PageReserved(page) &&
+ page_count(page) == 0)
+ return 1;
+ return 0;
+}
+
/*
* Freeing function for a buddy system allocator.
*
* at the bottom level available, and propagating the changes upward
* as necessary, plus some accounting needed to play nicely with other
* parts of the VM system.
- * At each level, we keep one bit for each pair of blocks, which
- * is set to 1 iff only one of the pair is allocated. So when we
- * are allocating or freeing one, we can derive the state of the
+ * At each level, we keep a list of pages, which are heads of continuous
+ * free pages of length of (1 << order) and marked with PG_Private.Page's
+ * order is recorded in page->private field.
+ * So when we are allocating or freeing one, we can derive the state of the
* other. That is, if we allocate a small block, and both were
* free, the remainder of the region must be split into blocks.
* If a block is freed, and its buddy is also free, then this
*/
static inline void __free_pages_bulk (struct page *page, struct page *base,
- struct zone *zone, struct free_area *area, unsigned int order)
+ struct zone *zone, unsigned int order)
{
- unsigned long page_idx, index, mask;
+ unsigned long page_idx;
+ struct page *coalesced;
+ int order_size = 1 << order;
- if (order)
+ if (unlikely(order))
destroy_compound_page(page, order);
- mask = (~0UL) << order;
+
page_idx = page - base;
- if (page_idx & ~mask)
- BUG();
- index = page_idx >> (1 + order);
- zone->free_pages += 1 << order;
+ BUG_ON(page_idx & (order_size - 1));
+ BUG_ON(bad_range(zone, page));
+
+ zone->free_pages += order_size;
while (order < MAX_ORDER-1) {
- struct page *buddy1, *buddy2;
+ struct free_area *area;
+ struct page *buddy;
+ int buddy_idx;
- BUG_ON(area >= zone->free_area + MAX_ORDER);
- if (!__test_and_change_bit(index, area->map))
- /*
- * the buddy page is still allocated.
- */
+ buddy_idx = (page_idx ^ (1 << order));
+ buddy = base + buddy_idx;
+ if (bad_range(zone, buddy))
+ break;
+ if (!page_is_buddy(buddy, order))
break;
-
/* Move the buddy up one level. */
- buddy1 = base + (page_idx ^ (1 << order));
- buddy2 = base + page_idx;
- BUG_ON(bad_range(zone, buddy1));
- BUG_ON(bad_range(zone, buddy2));
- list_del(&buddy1->lru);
- mask <<= 1;
+ list_del(&buddy->lru);
+ area = zone->free_area + order;
+ area->nr_free--;
+ rmv_page_order(buddy);
+ page_idx &= buddy_idx;
order++;
- area++;
- index >>= 1;
- page_idx &= mask;
}
- list_add(&(base + page_idx)->lru, &area->free_list);
+ coalesced = base + page_idx;
+ set_page_order(coalesced, order);
+ list_add(&coalesced->lru, &zone->free_area[order].free_list);
+ zone->free_area[order].nr_free++;
}
static inline void free_pages_check(const char *function, struct page *page)
struct list_head *list, unsigned int order)
{
unsigned long flags;
- struct free_area *area;
struct page *base, *page = NULL;
int ret = 0;
base = zone->zone_mem_map;
- area = zone->free_area + order;
spin_lock_irqsave(&zone->lock, flags);
zone->all_unreclaimable = 0;
zone->pages_scanned = 0;
page = list_entry(list->prev, struct page, lru);
/* have to delete it as __free_pages_bulk list manipulates */
list_del(&page->lru);
- __free_pages_bulk(page, base, zone, area, order);
+ __free_pages_bulk(page, base, zone, order);
ret++;
}
spin_unlock_irqrestore(&zone->lock, flags);
arch_free_page(page, order);
mod_page_state(pgfree, 1 << order);
+
+#ifndef CONFIG_MMU
+ if (order > 0)
+ for (i = 1 ; i < (1 << order) ; ++i)
+ __put_page(page + i);
+#endif
+
for (i = 0 ; i < (1 << order) ; ++i)
free_pages_check(__FUNCTION__, page + i);
list_add(&page->lru, &list);
free_pages_bulk(page_zone(page), 1, &list, order);
}
-#define MARK_USED(index, order, area) \
- __change_bit((index) >> (1+(order)), (area)->map)
/*
* The order of subdivision here is critical for the IO subsystem.
*/
static inline struct page *
expand(struct zone *zone, struct page *page,
- unsigned long index, int low, int high, struct free_area *area)
+ int low, int high, struct free_area *area)
{
unsigned long size = 1 << high;
size >>= 1;
BUG_ON(bad_range(zone, &page[size]));
list_add(&page[size].lru, &area->free_list);
- MARK_USED(index + size, high, area);
+ area->nr_free++;
+ set_page_order(&page[size], high);
}
return page;
}
-static inline void set_page_refs(struct page *page, int order)
+void set_page_refs(struct page *page, int order)
{
#ifdef CONFIG_MMU
set_page_count(page, 1);
/*
* We need to reference all the pages for this order, otherwise if
* anyone accesses one of the pages with (get/put) it will be freed.
+ * - eg: access_process_vm()
*/
for (i = 0; i < (1 << order); i++)
- set_page_count(page+i, 1);
+ set_page_count(page + i, 1);
#endif /* CONFIG_MMU */
}
1 << PG_checked | 1 << PG_mappedtodisk);
page->private = 0;
set_page_refs(page, order);
+ kernel_map_pages(page, 1 << order, 1);
}
/*
struct free_area * area;
unsigned int current_order;
struct page *page;
- unsigned int index;
for (current_order = order; current_order < MAX_ORDER; ++current_order) {
area = zone->free_area + current_order;
page = list_entry(area->free_list.next, struct page, lru);
list_del(&page->lru);
- index = page - zone->zone_mem_map;
- if (current_order != MAX_ORDER-1)
- MARK_USED(index, current_order, area);
+ rmv_page_order(page);
+ area->nr_free--;
zone->free_pages -= 1UL << order;
- return expand(zone, page, index, order, current_order, area);
+ return expand(zone, page, order, current_order, area);
}
return NULL;
#endif /* CONFIG_PM || CONFIG_HOTPLUG_CPU */
#ifdef CONFIG_PM
-int is_head_of_free_region(struct page *page)
+
+void mark_free_pages(struct zone *zone)
{
- struct zone *zone = page_zone(page);
- unsigned long flags;
+ unsigned long zone_pfn, flags;
int order;
struct list_head *curr;
- /*
- * Should not matter as we need quiescent system for
- * suspend anyway, but...
- */
+ if (!zone->spanned_pages)
+ return;
+
spin_lock_irqsave(&zone->lock, flags);
+ for (zone_pfn = 0; zone_pfn < zone->spanned_pages; ++zone_pfn)
+ ClearPageNosaveFree(pfn_to_page(zone_pfn + zone->zone_start_pfn));
+
for (order = MAX_ORDER - 1; order >= 0; --order)
- list_for_each(curr, &zone->free_area[order].free_list)
- if (page == list_entry(curr, struct page, lru)) {
- spin_unlock_irqrestore(&zone->lock, flags);
- return 1 << order;
- }
+ list_for_each(curr, &zone->free_area[order].free_list) {
+ unsigned long start_pfn, i;
+
+ start_pfn = page_to_pfn(list_entry(curr, struct page, lru));
+
+ for (i=0; i < (1<<order); i++)
+ SetPageNosaveFree(pfn_to_page(start_pfn+i));
+ }
spin_unlock_irqrestore(&zone->lock, flags);
- return 0;
}
/*
free_hot_cold_page(page, 1);
}
+static inline void prep_zero_page(struct page *page, int order, int gfp_flags)
+{
+ int i;
+
+ BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM);
+ for(i = 0; i < (1 << order); i++)
+ clear_highpage(page + i);
+}
+
/*
* Really, prep_compound_page() should be called from __rmqueue_bulk(). But
* we cheat by calling it from here, in the order > 0 path. Saves a branch
* or two.
*/
-
static struct page *
buffered_rmqueue(struct zone *zone, int order, int gfp_flags)
{
BUG_ON(bad_range(zone, page));
mod_page_state_zone(zone, pgalloc, 1 << order);
prep_new_page(page, order);
+
+ if (gfp_flags & __GFP_ZERO)
+ prep_zero_page(page, order, gfp_flags);
+
if (order && (gfp_flags & __GFP_COMP))
prep_compound_page(page, order);
}
return page;
}
+/*
+ * Return 1 if free pages are above 'mark'. This takes into account the order
+ * of the allocation.
+ */
+int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
+ int classzone_idx, int can_try_harder, int gfp_high)
+{
+ /* free_pages my go negative - that's OK */
+ long min = mark, free_pages = z->free_pages - (1 << order) + 1;
+ int o;
+
+ if (gfp_high)
+ min -= min / 2;
+ if (can_try_harder)
+ min -= min / 4;
+
+ if (free_pages <= min + z->lowmem_reserve[classzone_idx])
+ return 0;
+ for (o = 0; o < order; o++) {
+ /* At the next order, this order's pages become unavailable */
+ free_pages -= z->free_area[o].nr_free << o;
+
+ /* Require fewer higher order pages to be free */
+ min >>= 1;
+
+ if (free_pages <= min)
+ return 0;
+ }
+ return 1;
+}
+
/*
* This is the 'heart' of the zoned buddy allocator.
- *
- * Herein lies the mysterious "incremental min". That's the
- *
- * local_low = z->pages_low;
- * min += local_low;
- *
- * thing. The intent here is to provide additional protection to low zones for
- * allocation requests which _could_ use higher zones. So a GFP_HIGHMEM
- * request is not allowed to dip as deeply into the normal zone as a GFP_KERNEL
- * request. This preserves additional space in those lower zones for requests
- * which really do need memory from those zones. It means that on a decent
- * sized machine, GFP_HIGHMEM and GFP_KERNEL requests basically leave the DMA
- * zone untouched.
*/
struct page * fastcall
__alloc_pages(unsigned int gfp_mask, unsigned int order,
struct zonelist *zonelist)
{
const int wait = gfp_mask & __GFP_WAIT;
- unsigned long min;
struct zone **zones, *z;
struct page *page;
struct reclaim_state reclaim_state;
struct task_struct *p = current;
int i;
- int alloc_type;
+ int classzone_idx;
int do_retry;
int can_try_harder;
+ int did_some_progress;
might_sleep_if(wait);
return NULL;
}
- alloc_type = zone_idx(zones[0]);
+ classzone_idx = zone_idx(zones[0]);
+ restart:
/* Go through the zonelist once, looking for a zone with enough free */
for (i = 0; (z = zones[i]) != NULL; i++) {
- min = z->pages_low + (1<<order) + z->protection[alloc_type];
- if (z->free_pages < min)
+ if (!zone_watermark_ok(z, order, z->pages_low,
+ classzone_idx, 0, 0))
continue;
page = buffered_rmqueue(z, order, gfp_mask);
}
for (i = 0; (z = zones[i]) != NULL; i++)
- wakeup_kswapd(z);
+ wakeup_kswapd(z, order);
/*
* Go through the zonelist again. Let __GFP_HIGH and allocations
* coming from realtime tasks to go deeper into reserves
*/
for (i = 0; (z = zones[i]) != NULL; i++) {
- min = z->pages_min;
- if (gfp_mask & __GFP_HIGH)
- min /= 2;
- if (can_try_harder)
- min -= min / 4;
- min += (1<<order) + z->protection[alloc_type];
-
- if (z->free_pages < min)
+ if (!zone_watermark_ok(z, order, z->pages_min,
+ classzone_idx, can_try_harder,
+ gfp_mask & __GFP_HIGH))
continue;
page = buffered_rmqueue(z, order, gfp_mask);
}
/* This allocation should allow future memory freeing. */
- if ((p->flags & (PF_MEMALLOC | PF_MEMDIE)) && !in_interrupt()) {
+ if (((p->flags & PF_MEMALLOC) || unlikely(test_thread_flag(TIF_MEMDIE))) && !in_interrupt()) {
/* go through the zonelist yet again, ignoring mins */
for (i = 0; (z = zones[i]) != NULL; i++) {
page = buffered_rmqueue(z, order, gfp_mask);
goto nopage;
rebalance:
+ cond_resched();
+
/* We now go into synchronous reclaim */
p->flags |= PF_MEMALLOC;
reclaim_state.reclaimed_slab = 0;
p->reclaim_state = &reclaim_state;
- try_to_free_pages(zones, gfp_mask, order);
+ did_some_progress = try_to_free_pages(zones, gfp_mask, order);
p->reclaim_state = NULL;
p->flags &= ~PF_MEMALLOC;
- /* go through the zonelist yet one more time */
- for (i = 0; (z = zones[i]) != NULL; i++) {
- min = z->pages_min;
- if (gfp_mask & __GFP_HIGH)
- min /= 2;
- if (can_try_harder)
- min -= min / 4;
- min += (1<<order) + z->protection[alloc_type];
-
- if (z->free_pages < min)
- continue;
+ cond_resched();
- page = buffered_rmqueue(z, order, gfp_mask);
- if (page)
- goto got_pg;
+ if (likely(did_some_progress)) {
+ /*
+ * Go through the zonelist yet one more time, keep
+ * very high watermark here, this is only to catch
+ * a parallel oom killing, we must fail if we're still
+ * under heavy pressure.
+ */
+ for (i = 0; (z = zones[i]) != NULL; i++) {
+ if (!zone_watermark_ok(z, order, z->pages_min,
+ classzone_idx, can_try_harder,
+ gfp_mask & __GFP_HIGH))
+ continue;
+
+ page = buffered_rmqueue(z, order, gfp_mask);
+ if (page)
+ goto got_pg;
+ }
+ } else if ((gfp_mask & __GFP_FS) && !(gfp_mask & __GFP_NORETRY)) {
+ /*
+ * Go through the zonelist yet one more time, keep
+ * very high watermark here, this is only to catch
+ * a parallel oom killing, we must fail if we're still
+ * under heavy pressure.
+ */
+ for (i = 0; (z = zones[i]) != NULL; i++) {
+ if (!zone_watermark_ok(z, order, z->pages_high,
+ classzone_idx, 0, 0))
+ continue;
+
+ page = buffered_rmqueue(z, order, gfp_mask);
+ if (page)
+ goto got_pg;
+ }
+
+ out_of_memory(gfp_mask);
+ goto restart;
}
/*
return NULL;
got_pg:
zone_statistics(zonelist, z);
- kernel_map_pages(page, 1 << order, 1);
return page;
}
*/
BUG_ON(gfp_mask & __GFP_HIGHMEM);
- page = alloc_pages(gfp_mask, 0);
- if (page) {
- void *address = page_address(page);
- clear_page(address);
- return (unsigned long) address;
- }
+ page = alloc_pages(gfp_mask | __GFP_ZERO, 0);
+ if (page)
+ return (unsigned long) page_address(page);
return 0;
}
* The result is unavoidably approximate - it can change
* during and after execution of this function.
*/
-DEFINE_PER_CPU(struct page_state, page_states) = {0};
-EXPORT_PER_CPU_SYMBOL(page_states);
+static DEFINE_PER_CPU(struct page_state, page_states) = {0};
atomic_t nr_pagecache = ATOMIC_INIT(0);
EXPORT_SYMBOL(nr_pagecache);
int cpu = 0;
memset(ret, 0, sizeof(*ret));
+
+ cpu = first_cpu(cpu_online_map);
while (cpu < NR_CPUS) {
unsigned long *in, *out, off;
- if (!cpu_possible(cpu)) {
- cpu++;
- continue;
- }
-
in = (unsigned long *)&per_cpu(page_states, cpu);
- cpu++;
- if (cpu < NR_CPUS && cpu_possible(cpu))
+
+ cpu = next_cpu(cpu, cpu_online_map);
+
+ if (cpu < NR_CPUS)
prefetch(&per_cpu(page_states, cpu));
+
out = (unsigned long *)ret;
for (off = 0; off < nr; off++)
*out++ += *in++;
unsigned long ret = 0;
int cpu;
- for (cpu = 0; cpu < NR_CPUS; cpu++) {
+ for_each_online_cpu(cpu) {
unsigned long in;
- if (!cpu_possible(cpu))
- continue;
-
in = (unsigned long)&per_cpu(page_states, cpu) + offset;
ret += *((unsigned long *)in);
}
return ret;
}
+void __mod_page_state(unsigned offset, unsigned long delta)
+{
+ unsigned long flags;
+ void* ptr;
+
+ local_irq_save(flags);
+ ptr = &__get_cpu_var(page_states);
+ *(unsigned long*)(ptr + offset) += delta;
+ local_irq_restore(flags);
+}
+
+EXPORT_SYMBOL(__mod_page_state);
+
void __get_zone_counts(unsigned long *active, unsigned long *inactive,
unsigned long *free, struct pglist_data *pgdat)
{
" active:%lukB"
" inactive:%lukB"
" present:%lukB"
+ " pages_scanned:%lu"
+ " all_unreclaimable? %s"
"\n",
zone->name,
K(zone->free_pages),
K(zone->pages_high),
K(zone->nr_active),
K(zone->nr_inactive),
- K(zone->present_pages)
+ K(zone->present_pages),
+ zone->pages_scanned,
+ (zone->all_unreclaimable ? "yes" : "no")
);
- printk("protections[]:");
+ printk("lowmem_reserve[]:");
for (i = 0; i < MAX_NR_ZONES; i++)
- printk(" %lu", zone->protection[i]);
+ printk(" %lu", zone->lowmem_reserve[i]);
printk("\n");
}
for_each_zone(zone) {
- struct list_head *elem;
unsigned long nr, flags, order, total = 0;
show_node(zone);
spin_lock_irqsave(&zone->lock, flags);
for (order = 0; order < MAX_ORDER; order++) {
- nr = 0;
- list_for_each(elem, &zone->free_area[order].free_list)
- ++nr;
+ nr = zone->free_area[order].nr_free;
total += nr << order;
printk("%lu*%lukB ", nr, K(1UL) << order);
}
}
#ifdef CONFIG_NUMA
-#define MAX_NODE_LOAD (numnodes)
+#define MAX_NODE_LOAD (num_online_nodes())
static int __initdata node_load[MAX_NUMNODES];
/**
* find_next_best_node - find the next node that should appear in a given
* node's fallback list
* @node: node whose fallback list we're appending
- * @used_node_mask: pointer to the bitmap of already used nodes
+ * @used_node_mask: nodemask_t of already used nodes
*
* We use a number of factors to determine which is the next node that should
* appear on a given node's fallback list. The node should not have appeared
* on them otherwise.
* It returns -1 if no node is found.
*/
-static int __init find_next_best_node(int node, void *used_node_mask)
+static int __init find_next_best_node(int node, nodemask_t *used_node_mask)
{
int i, n, val;
int min_val = INT_MAX;
int best_node = -1;
- for (i = 0; i < numnodes; i++) {
+ for_each_online_node(i) {
cpumask_t tmp;
/* Start from local node */
- n = (node+i)%numnodes;
+ n = (node+i) % num_online_nodes();
/* Don't want a node to appear more than once */
- if (test_bit(n, used_node_mask))
+ if (node_isset(n, *used_node_mask))
continue;
+ /* Use the local node if we haven't already */
+ if (!node_isset(node, *used_node_mask)) {
+ best_node = node;
+ break;
+ }
+
/* Use the distance array to find the distance */
val = node_distance(node, n);
}
if (best_node >= 0)
- set_bit(best_node, used_node_mask);
+ node_set(best_node, *used_node_mask);
return best_node;
}
int i, j, k, node, local_node;
int prev_node, load;
struct zonelist *zonelist;
- DECLARE_BITMAP(used_mask, MAX_NUMNODES);
+ nodemask_t used_mask;
/* initialize zonelists */
for (i = 0; i < GFP_ZONETYPES; i++) {
/* NUMA-aware ordering of nodes */
local_node = pgdat->node_id;
- load = numnodes;
+ load = num_online_nodes();
prev_node = local_node;
- bitmap_zero(used_mask, MAX_NUMNODES);
- while ((node = find_next_best_node(local_node, used_mask)) >= 0) {
+ nodes_clear(used_mask);
+ while ((node = find_next_best_node(local_node, &used_mask)) >= 0) {
/*
* We don't want to pressure a particular node.
* So adding penalty to the first node in same
* zones coming right after the local ones are those from
* node N+1 (modulo N)
*/
- for (node = local_node + 1; node < numnodes; node++)
- j = build_zonelists_node(NODE_DATA(node), zonelist, j, k);
- for (node = 0; node < local_node; node++)
- j = build_zonelists_node(NODE_DATA(node), zonelist, j, k);
-
+ for (node = local_node + 1; node < MAX_NUMNODES; node++) {
+ if (!node_online(node))
+ continue;
+ j = build_zonelists_node(NODE_DATA(node), zonelist, j, k);
+ }
+ for (node = 0; node < local_node; node++) {
+ if (!node_online(node))
+ continue;
+ j = build_zonelists_node(NODE_DATA(node), zonelist, j, k);
+ }
+
zonelist->zones[j] = NULL;
}
}
{
int i;
- for(i = 0 ; i < numnodes ; i++)
+ for_each_online_node(i)
build_zonelists(NODE_DATA(i));
- printk("Built %i zonelists\n", numnodes);
+ printk("Built %i zonelists\n", num_online_nodes());
}
/*
}
}
-/*
- * Page buddy system uses "index >> (i+1)", where "index" is
- * at most "size-1".
- *
- * The extra "+3" is to round down to byte size (8 bits per byte
- * assumption). Thus we get "(size-1) >> (i+4)" as the last byte
- * we can access.
- *
- * The "+1" is because we want to round the byte allocation up
- * rather than down. So we should have had a "+7" before we shifted
- * down by three. Also, we have to add one as we actually _use_ the
- * last bit (it's [0,n] inclusive, not [0,n[).
- *
- * So we actually had +7+1 before we shift down by 3. But
- * (n+8) >> 3 == (n >> 3) + 1 (modulo overflows, which we do not have).
- *
- * Finally, we LONG_ALIGN because all bitmap operations are on longs.
- */
-unsigned long pages_to_bitmap_size(unsigned long order, unsigned long nr_pages)
-{
- unsigned long bitmap_size;
-
- bitmap_size = (nr_pages-1) >> (order+4);
- bitmap_size = LONG_ALIGN(bitmap_size+1);
-
- return bitmap_size;
-}
-
-void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone, unsigned long size)
+void zone_init_free_lists(struct pglist_data *pgdat, struct zone *zone,
+ unsigned long size)
{
int order;
- for (order = 0; ; order++) {
- unsigned long bitmap_size;
-
+ for (order = 0; order < MAX_ORDER ; order++) {
INIT_LIST_HEAD(&zone->free_area[order].free_list);
- if (order == MAX_ORDER-1) {
- zone->free_area[order].map = NULL;
- break;
- }
-
- bitmap_size = pages_to_bitmap_size(order, size);
- zone->free_area[order].map =
- (unsigned long *) alloc_bootmem_node(pgdat, bitmap_size);
+ zone->free_area[order].nr_free = 0;
}
}
pgdat->nr_zones = 0;
init_waitqueue_head(&pgdat->kswapd_wait);
+ pgdat->kswapd_max_order = 0;
for (j = 0; j < MAX_NR_ZONES; j++) {
struct zone *zone = pgdat->node_zones + j;
zone->zone_start_pfn = zone_start_pfn;
if ((zone_start_pfn) & (zone_required_alignment-1))
- printk("BUG: wrong zone alignment, it will crash\n");
+ printk(KERN_CRIT "BUG: wrong zone alignment, it will crash\n");
memmap_init(size, nid, j, zone_start_pfn);
}
/*
- * This walks the freelist for each zone. Whilst this is slow, I'd rather
- * be slow here than slow down the fast path by keeping stats - mjbligh
+ * This walks the free areas for each zone.
*/
static int frag_show(struct seq_file *m, void *arg)
{
spin_lock_irqsave(&zone->lock, flags);
seq_printf(m, "Node %d, zone %8s ", pgdat->node_id, zone->name);
- for (order = 0; order < MAX_ORDER; ++order) {
- unsigned long nr_bufs = 0;
- struct list_head *elem;
-
- list_for_each(elem, &(zone->free_area[order].free_list))
- ++nr_bufs;
- seq_printf(m, "%6lu ", nr_bufs);
- }
+ for (order = 0; order < MAX_ORDER; ++order)
+ seq_printf(m, "%6lu ", zone->free_area[order].nr_free);
spin_unlock_irqrestore(&zone->lock, flags);
seq_putc(m, '\n');
}
{
int cpu = (unsigned long)hcpu;
long *count;
+ unsigned long *src, *dest;
if (action == CPU_DEAD) {
+ int i;
+
/* Drain local pagecache count. */
count = &per_cpu(nr_pagecache_local, cpu);
atomic_add(*count, &nr_pagecache);
*count = 0;
local_irq_disable();
__drain_pages(cpu);
+
+ /* Add dead cpu's page_states to our own. */
+ dest = (unsigned long *)&__get_cpu_var(page_states);
+ src = (unsigned long *)&per_cpu(page_states, cpu);
+
+ for (i = 0; i < sizeof(struct page_state)/sizeof(unsigned long);
+ i++) {
+ dest[i] += src[i];
+ src[i] = 0;
+ }
+
local_irq_enable();
}
return NOTIFY_OK;
hotcpu_notifier(page_alloc_cpu_notify, 0);
}
-static unsigned long higherzone_val(struct zone *z, int max_zone,
- int alloc_type)
-{
- int z_idx = zone_idx(z);
- struct zone *higherzone;
- unsigned long pages;
-
- /* there is no higher zone to get a contribution from */
- if (z_idx == MAX_NR_ZONES-1)
- return 0;
-
- higherzone = &z->zone_pgdat->node_zones[z_idx+1];
-
- /* We always start with the higher zone's protection value */
- pages = higherzone->protection[alloc_type];
-
- /*
- * We get a lower-zone-protection contribution only if there are
- * pages in the higher zone and if we're not the highest zone
- * in the current zonelist. e.g., never happens for GFP_DMA. Happens
- * only for ZONE_DMA in a GFP_KERNEL allocation and happens for ZONE_DMA
- * and ZONE_NORMAL for a GFP_HIGHMEM allocation.
- */
- if (higherzone->present_pages && z_idx < alloc_type)
- pages += higherzone->pages_low * sysctl_lower_zone_protection;
-
- return pages;
-}
-
/*
- * setup_per_zone_protection - called whenver min_free_kbytes or
- * sysctl_lower_zone_protection changes. Ensures that each zone
- * has a correct pages_protected value, so an adequate number of
+ * setup_per_zone_lowmem_reserve - called whenever
+ * sysctl_lower_zone_reserve_ratio changes. Ensures that each zone
+ * has a correct pages reserved value, so an adequate number of
* pages are left in the zone after a successful __alloc_pages().
- *
- * This algorithm is way confusing. I tries to keep the same behavior
- * as we had with the incremental min iterative algorithm.
*/
-static void setup_per_zone_protection(void)
+static void setup_per_zone_lowmem_reserve(void)
{
struct pglist_data *pgdat;
- struct zone *zones, *zone;
- int max_zone;
- int i, j;
+ int j, idx;
for_each_pgdat(pgdat) {
- zones = pgdat->node_zones;
+ for (j = 0; j < MAX_NR_ZONES; j++) {
+ struct zone * zone = pgdat->node_zones + j;
+ unsigned long present_pages = zone->present_pages;
- for (i = 0, max_zone = 0; i < MAX_NR_ZONES; i++)
- if (zones[i].present_pages)
- max_zone = i;
+ zone->lowmem_reserve[j] = 0;
- /*
- * For each of the different allocation types:
- * GFP_DMA -> GFP_KERNEL -> GFP_HIGHMEM
- */
- for (i = 0; i < GFP_ZONETYPES; i++) {
- /*
- * For each of the zones:
- * ZONE_HIGHMEM -> ZONE_NORMAL -> ZONE_DMA
- */
- for (j = MAX_NR_ZONES-1; j >= 0; j--) {
- zone = &zones[j];
-
- /*
- * We never protect zones that don't have memory
- * in them (j>max_zone) or zones that aren't in
- * the zonelists for a certain type of
- * allocation (j>=i). We have to assign these
- * to zero because the lower zones take
- * contributions from the higher zones.
- */
- if (j > max_zone || j >= i) {
- zone->protection[i] = 0;
- continue;
- }
- /*
- * The contribution of the next higher zone
- */
- zone->protection[i] = higherzone_val(zone,
- max_zone, i);
+ for (idx = j-1; idx >= 0; idx--) {
+ struct zone * lower_zone = pgdat->node_zones + idx;
+
+ lower_zone->lowmem_reserve[j] = present_pages / sysctl_lowmem_reserve_ratio[idx];
+ present_pages += lower_zone->present_pages;
}
}
}
lowmem_pages;
}
- zone->pages_low = zone->pages_min * 2;
- zone->pages_high = zone->pages_min * 3;
+ /*
+ * When interpreting these watermarks, just keep in mind that:
+ * zone->pages_min == (zone->pages_min * 4) / 4;
+ */
+ zone->pages_low = (zone->pages_min * 5) / 4;
+ zone->pages_high = (zone->pages_min * 6) / 4;
spin_unlock_irqrestore(&zone->lru_lock, flags);
}
}
* Initialise min_free_kbytes.
*
* For small machines we want it small (128k min). For large machines
- * we want it large (16MB max). But it is not linear, because network
+ * we want it large (64MB max). But it is not linear, because network
* bandwidth does not increase linearly with machine size. We use
*
- * min_free_kbytes = sqrt(lowmem_kbytes)
+ * min_free_kbytes = 4 * sqrt(lowmem_kbytes), for better accuracy:
+ * min_free_kbytes = sqrt(lowmem_kbytes * 16)
*
* which yields
*
- * 16MB: 128k
- * 32MB: 181k
- * 64MB: 256k
- * 128MB: 362k
- * 256MB: 512k
- * 512MB: 724k
- * 1024MB: 1024k
- * 2048MB: 1448k
- * 4096MB: 2048k
- * 8192MB: 2896k
- * 16384MB: 4096k
+ * 16MB: 512k
+ * 32MB: 724k
+ * 64MB: 1024k
+ * 128MB: 1448k
+ * 256MB: 2048k
+ * 512MB: 2896k
+ * 1024MB: 4096k
+ * 2048MB: 5792k
+ * 4096MB: 8192k
+ * 8192MB: 11584k
+ * 16384MB: 16384k
*/
static int __init init_per_zone_pages_min(void)
{
lowmem_kbytes = nr_free_buffer_pages() * (PAGE_SIZE >> 10);
- min_free_kbytes = int_sqrt(lowmem_kbytes);
+ min_free_kbytes = int_sqrt(lowmem_kbytes * 16);
if (min_free_kbytes < 128)
min_free_kbytes = 128;
- if (min_free_kbytes > 16384)
- min_free_kbytes = 16384;
+ if (min_free_kbytes > 65536)
+ min_free_kbytes = 65536;
setup_per_zone_pages_min();
- setup_per_zone_protection();
+ setup_per_zone_lowmem_reserve();
return 0;
}
module_init(init_per_zone_pages_min)
{
proc_dointvec(table, write, file, buffer, length, ppos);
setup_per_zone_pages_min();
- setup_per_zone_protection();
return 0;
}
/*
- * lower_zone_protection_sysctl_handler - just a wrapper around
- * proc_dointvec() so that we can call setup_per_zone_protection()
- * whenever sysctl_lower_zone_protection changes.
+ * lowmem_reserve_ratio_sysctl_handler - just a wrapper around
+ * proc_dointvec() so that we can call setup_per_zone_lowmem_reserve()
+ * whenever sysctl_lowmem_reserve_ratio changes.
+ *
+ * The reserve ratio obviously has absolutely no relation with the
+ * pages_min watermarks. The lowmem reserve ratio can only make sense
+ * if in function of the boot time zone sizes.
*/
-int lower_zone_protection_sysctl_handler(ctl_table *table, int write,
+int lowmem_reserve_ratio_sysctl_handler(ctl_table *table, int write,
struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
{
proc_dointvec_minmax(table, write, file, buffer, length, ppos);
- setup_per_zone_protection();
+ setup_per_zone_lowmem_reserve();
return 0;
}
+__initdata int hashdist = HASHDIST_DEFAULT;
+
+#ifdef CONFIG_NUMA
+static int __init set_hashdist(char *str)
+{
+ if (!str)
+ return 0;
+ hashdist = simple_strtoul(str, &str, 0);
+ return 1;
+}
+__setup("hashdist=", set_hashdist);
+#endif
+
/*
* allocate a large system hash table from bootmem
* - it is assumed that the hash table must contain an exact power-of-2
* quantity of entries
+ * - limit is the number of hash buckets, not the total allocation size
*/
void *__init alloc_large_system_hash(const char *tablename,
unsigned long bucketsize,
unsigned long numentries,
int scale,
- int consider_highmem,
+ int flags,
unsigned int *_hash_shift,
- unsigned int *_hash_mask)
+ unsigned int *_hash_mask,
+ unsigned long limit)
{
- unsigned long long max;
+ unsigned long long max = limit;
unsigned long log2qty, size;
- void *table;
+ void *table = NULL;
/* allow the kernel cmdline to have a say */
if (!numentries) {
/* round applicable memory size up to nearest megabyte */
- numentries = consider_highmem ? nr_all_pages : nr_kernel_pages;
+ numentries = (flags & HASH_HIGHMEM) ? nr_all_pages : nr_kernel_pages;
numentries += (1UL << (20 - PAGE_SHIFT)) - 1;
numentries >>= 20 - PAGE_SHIFT;
numentries <<= 20 - PAGE_SHIFT;
/* rounded up to nearest power of 2 in size */
numentries = 1UL << (long_log2(numentries) + 1);
- /* limit allocation size to 1/16 total memory */
- max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
- do_div(max, bucketsize);
+ /* limit allocation size to 1/16 total memory by default */
+ if (max == 0) {
+ max = ((unsigned long long)nr_all_pages << PAGE_SHIFT) >> 4;
+ do_div(max, bucketsize);
+ }
if (numentries > max)
numentries = max;
do {
size = bucketsize << log2qty;
- table = alloc_bootmem(size);
+ if (flags & HASH_EARLY)
+ table = alloc_bootmem(size);
+ else if (hashdist)
+ table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
+ else {
+ unsigned long order;
+ for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++)
+ ;
+ table = (void*) __get_free_pages(GFP_ATOMIC, order);
+ }
} while (!table && size > PAGE_SIZE && --log2qty);
if (!table)
git://git.onelab.eu / linux-2.6.git / blobdiff