/*
* This file contains the default values for the opereation of the
* Linux VM subsystem. Fine-tuning documentation can be found in
- * linux/Documentation/sysctl/vm.txt.
+ * Documentation/sysctl/vm.txt.
* Started 18.12.91
* Swap aging added 23.2.95, Stephen Tweedie.
* Buffermem limits added 12.3.98, Rik van Riel.
/* How many pages do we try to swap or page in/out together? */
int page_cluster;
-#ifdef CONFIG_HUGETLB_PAGE
-
-void put_page(struct page *page)
+static void put_compound_page(struct page *page)
{
- if (unlikely(PageCompound(page))) {
- page = (struct page *)page->private;
- if (put_page_testzero(page)) {
- void (*dtor)(struct page *page);
+ page = (struct page *)page_private(page);
+ if (put_page_testzero(page)) {
+ void (*dtor)(struct page *page);
- dtor = (void (*)(struct page *))page[1].mapping;
- (*dtor)(page);
- }
- return;
+ dtor = (void (*)(struct page *))page[1].lru.next;
+ (*dtor)(page);
}
- if (!PageReserved(page) && put_page_testzero(page))
+}
+
+void put_page(struct page *page)
+{
+ if (unlikely(PageCompound(page)))
+ put_compound_page(page);
+ else if (put_page_testzero(page))
__page_cache_release(page);
}
EXPORT_SYMBOL(put_page);
-#endif
/*
* Writeback is about to end against a page which has been marked for immediate
put_cpu_var(lru_add_active_pvecs);
}
-void lru_add_drain(void)
+static void __lru_add_drain(int cpu)
{
- struct pagevec *pvec = &get_cpu_var(lru_add_pvecs);
+ struct pagevec *pvec = &per_cpu(lru_add_pvecs, cpu);
+ /* CPU is dead, so no locking needed. */
if (pagevec_count(pvec))
__pagevec_lru_add(pvec);
- pvec = &__get_cpu_var(lru_add_active_pvecs);
+ pvec = &per_cpu(lru_add_active_pvecs, cpu);
if (pagevec_count(pvec))
__pagevec_lru_add_active(pvec);
- put_cpu_var(lru_add_pvecs);
}
+void lru_add_drain(void)
+{
+ __lru_add_drain(get_cpu());
+ put_cpu();
+}
+
+#ifdef CONFIG_NUMA
+static void lru_add_drain_per_cpu(void *dummy)
+{
+ lru_add_drain();
+}
+
+/*
+ * Returns 0 for success
+ */
+int lru_add_drain_all(void)
+{
+ return schedule_on_each_cpu(lru_add_drain_per_cpu, NULL);
+}
+
+#else
+
+/*
+ * Returns 0 for success
+ */
+int lru_add_drain_all(void)
+{
+ lru_add_drain();
+ return 0;
+}
+#endif
+
/*
* This path almost never happens for VM activity - pages are normally
* freed via pagevecs. But it gets used by networking.
struct page *page = pages[i];
struct zone *pagezone;
- if (PageReserved(page) || !put_page_testzero(page))
+ if (unlikely(PageCompound(page))) {
+ if (zone) {
+ spin_unlock_irq(&zone->lru_lock);
+ zone = NULL;
+ }
+ put_compound_page(page);
+ continue;
+ }
+
+ if (!put_page_testzero(page))
continue;
pagezone = page_zone(page);
pagevec_reinit(pvec);
}
+EXPORT_SYMBOL(__pagevec_release);
+
/*
* pagevec_release() for pages which are known to not be on the LRU
*
struct pagevec pages_to_free;
pagevec_init(&pages_to_free, pvec->cold);
- pages_to_free.cold = pvec->cold;
for (i = 0; i < pagevec_count(pvec); i++) {
struct page *page = pvec->pages[i];
struct page *page = pvec->pages[i];
if (PagePrivate(page) && !TestSetPageLocked(page)) {
- try_to_release_page(page, 0);
+ if (PagePrivate(page))
+ try_to_release_page(page, 0);
unlock_page(page);
}
}
return pagevec_count(pvec);
}
+EXPORT_SYMBOL(pagevec_lookup);
+
unsigned pagevec_lookup_tag(struct pagevec *pvec, struct address_space *mapping,
pgoff_t *index, int tag, unsigned nr_pages)
{
return pagevec_count(pvec);
}
+EXPORT_SYMBOL(pagevec_lookup_tag);
#ifdef CONFIG_SMP
/*
}
preempt_enable();
}
-EXPORT_SYMBOL(vm_acct_memory);
#ifdef CONFIG_HOTPLUG_CPU
-static void lru_drain_cache(unsigned int cpu)
-{
- struct pagevec *pvec = &per_cpu(lru_add_pvecs, cpu);
-
- /* CPU is dead, so no locking needed. */
- if (pagevec_count(pvec))
- __pagevec_lru_add(pvec);
- pvec = &per_cpu(lru_add_active_pvecs, cpu);
- if (pagevec_count(pvec))
- __pagevec_lru_add_active(pvec);
-}
/* Drop the CPU's cached committed space back into the central pool. */
static int cpu_swap_callback(struct notifier_block *nfb,
if (action == CPU_DEAD) {
atomic_add(*committed, &vm_committed_space);
*committed = 0;
- lru_drain_cache((long)hcpu);
+ __lru_add_drain((long)hcpu);
}
return NOTIFY_OK;
}
if (count >= FBC_BATCH || count <= -FBC_BATCH) {
spin_lock(&fbc->lock);
fbc->count += count;
+ *pcount = 0;
spin_unlock(&fbc->lock);
- count = 0;
+ } else {
+ *pcount = count;
}
- *pcount = count;
put_cpu();
}
EXPORT_SYMBOL(percpu_counter_mod);
+
+/*
+ * Add up all the per-cpu counts, return the result. This is a more accurate
+ * but much slower version of percpu_counter_read_positive()
+ */
+long percpu_counter_sum(struct percpu_counter *fbc)
+{
+ long ret;
+ int cpu;
+
+ spin_lock(&fbc->lock);
+ ret = fbc->count;
+ for_each_cpu(cpu) {
+ long *pcount = per_cpu_ptr(fbc->counters, cpu);
+ ret += *pcount;
+ }
+ spin_unlock(&fbc->lock);
+ return ret < 0 ? 0 : ret;
+}
+EXPORT_SYMBOL(percpu_counter_sum);
#endif
/*