return ret;
}
-/*
- * Batch_start/batch_end is called in unmap_page_range/invlidate/trucate.
- * In that cases, pages are freed continuously and we can expect pages
- * are in the same memcg. All these calls itself limits the number of
- * pages freed at once, then uncharge_start/end() is called properly.
- * This may be called prural(2) times in a context,
- */
-
-void mem_cgroup_uncharge_start(void)
-{
- unsigned long flags;
-
- local_irq_save(flags);
- current->memcg_batch.do_batch++;
- /* We can do nest. */
- if (current->memcg_batch.do_batch == 1) {
- current->memcg_batch.memcg = NULL;
- current->memcg_batch.nr_pages = 0;
- current->memcg_batch.memsw_nr_pages = 0;
- }
- local_irq_restore(flags);
-}
-
-void mem_cgroup_uncharge_end(void)
-{
- struct memcg_batch_info *batch = ¤t->memcg_batch;
- unsigned long flags;
-
- local_irq_save(flags);
- VM_BUG_ON(!batch->do_batch);
- if (--batch->do_batch) /* If stacked, do nothing */
- goto out;
- /*
- * This "batch->memcg" is valid without any css_get/put etc...
- * bacause we hide charges behind us.
- */
- if (batch->nr_pages)
- res_counter_uncharge(&batch->memcg->res,
- batch->nr_pages * PAGE_SIZE);
- if (batch->memsw_nr_pages)
- res_counter_uncharge(&batch->memcg->memsw,
- batch->memsw_nr_pages * PAGE_SIZE);
- memcg_oom_recover(batch->memcg);
-out:
- local_irq_restore(flags);
-}
-
#ifdef CONFIG_MEMCG_SWAP
static void mem_cgroup_swap_statistics(struct mem_cgroup *memcg,
bool charge)
cancel_charge(memcg, nr_pages);
}
+static void uncharge_batch(struct mem_cgroup *memcg, unsigned long pgpgout,
+ unsigned long nr_mem, unsigned long nr_memsw,
+ unsigned long nr_anon, unsigned long nr_file,
+ unsigned long nr_huge, struct page *dummy_page)
+{
+ unsigned long flags;
+
+ if (nr_mem)
+ res_counter_uncharge(&memcg->res, nr_mem * PAGE_SIZE);
+ if (nr_memsw)
+ res_counter_uncharge(&memcg->memsw, nr_memsw * PAGE_SIZE);
+
+ memcg_oom_recover(memcg);
+
+ local_irq_save(flags);
+ __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS], nr_anon);
+ __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_CACHE], nr_file);
+ __this_cpu_sub(memcg->stat->count[MEM_CGROUP_STAT_RSS_HUGE], nr_huge);
+ __this_cpu_add(memcg->stat->events[MEM_CGROUP_EVENTS_PGPGOUT], pgpgout);
+ __this_cpu_add(memcg->stat->nr_page_events, nr_anon + nr_file);
+ memcg_check_events(memcg, dummy_page);
+ local_irq_restore(flags);
+}
+
+static void uncharge_list(struct list_head *page_list)
+{
+ struct mem_cgroup *memcg = NULL;
+ unsigned long nr_memsw = 0;
+ unsigned long nr_anon = 0;
+ unsigned long nr_file = 0;
+ unsigned long nr_huge = 0;
+ unsigned long pgpgout = 0;
+ unsigned long nr_mem = 0;
+ struct list_head *next;
+ struct page *page;
+
+ next = page_list->next;
+ do {
+ unsigned int nr_pages = 1;
+ struct page_cgroup *pc;
+
+ page = list_entry(next, struct page, lru);
+ next = page->lru.next;
+
+ VM_BUG_ON_PAGE(PageLRU(page), page);
+ VM_BUG_ON_PAGE(page_count(page), page);
+
+ pc = lookup_page_cgroup(page);
+ if (!PageCgroupUsed(pc))
+ continue;
+
+ /*
+ * Nobody should be changing or seriously looking at
+ * pc->mem_cgroup and pc->flags at this point, we have
+ * fully exclusive access to the page.
+ */
+
+ if (memcg != pc->mem_cgroup) {
+ if (memcg) {
+ uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
+ nr_anon, nr_file, nr_huge, page);
+ pgpgout = nr_mem = nr_memsw = 0;
+ nr_anon = nr_file = nr_huge = 0;
+ }
+ memcg = pc->mem_cgroup;
+ }
+
+ if (PageTransHuge(page)) {
+ nr_pages <<= compound_order(page);
+ VM_BUG_ON_PAGE(!PageTransHuge(page), page);
+ nr_huge += nr_pages;
+ }
+
+ if (PageAnon(page))
+ nr_anon += nr_pages;
+ else
+ nr_file += nr_pages;
+
+ if (pc->flags & PCG_MEM)
+ nr_mem += nr_pages;
+ if (pc->flags & PCG_MEMSW)
+ nr_memsw += nr_pages;
+ pc->flags = 0;
+
+ pgpgout++;
+ } while (next != page_list);
+
+ if (memcg)
+ uncharge_batch(memcg, pgpgout, nr_mem, nr_memsw,
+ nr_anon, nr_file, nr_huge, page);
+}
+
/**
* mem_cgroup_uncharge - uncharge a page
* @page: page to uncharge
*/
void mem_cgroup_uncharge(struct page *page)
{
- struct memcg_batch_info *batch;
- unsigned int nr_pages = 1;
- struct mem_cgroup *memcg;
struct page_cgroup *pc;
- unsigned long pc_flags;
- unsigned long flags;
-
- VM_BUG_ON_PAGE(PageLRU(page), page);
- VM_BUG_ON_PAGE(page_count(page), page);
if (mem_cgroup_disabled())
return;
+ /* Don't touch page->lru of any random page, pre-check: */
pc = lookup_page_cgroup(page);
-
- /* Every final put_page() ends up here */
if (!PageCgroupUsed(pc))
return;
- if (PageTransHuge(page)) {
- nr_pages <<= compound_order(page);
- VM_BUG_ON_PAGE(!PageTransHuge(page), page);
- }
- /*
- * Nobody should be changing or seriously looking at
- * pc->mem_cgroup and pc->flags at this point, we have fully
- * exclusive access to the page.
- */
- memcg = pc->mem_cgroup;
- pc_flags = pc->flags;
- pc->flags = 0;
-
- local_irq_save(flags);
+ INIT_LIST_HEAD(&page->lru);
+ uncharge_list(&page->lru);
+}
- if (nr_pages > 1)
- goto direct;
- if (unlikely(test_thread_flag(TIF_MEMDIE)))
- goto direct;
- batch = ¤t->memcg_batch;
- if (!batch->do_batch)
- goto direct;
- if (batch->memcg && batch->memcg != memcg)
- goto direct;
- if (!batch->memcg)
- batch->memcg = memcg;
- if (pc_flags & PCG_MEM)
- batch->nr_pages++;
- if (pc_flags & PCG_MEMSW)
- batch->memsw_nr_pages++;
- goto out;
-direct:
- if (pc_flags & PCG_MEM)
- res_counter_uncharge(&memcg->res, nr_pages * PAGE_SIZE);
- if (pc_flags & PCG_MEMSW)
- res_counter_uncharge(&memcg->memsw, nr_pages * PAGE_SIZE);
- memcg_oom_recover(memcg);
-out:
- mem_cgroup_charge_statistics(memcg, page, -nr_pages);
- memcg_check_events(memcg, page);
+/**
+ * mem_cgroup_uncharge_list - uncharge a list of page
+ * @page_list: list of pages to uncharge
+ *
+ * Uncharge a list of pages previously charged with
+ * mem_cgroup_try_charge() and mem_cgroup_commit_charge().
+ */
+void mem_cgroup_uncharge_list(struct list_head *page_list)
+{
+ if (mem_cgroup_disabled())
+ return;
- local_irq_restore(flags);
+ if (!list_empty(page_list))
+ uncharge_list(page_list);
}
/**
cond_resched();
- mem_cgroup_uncharge_start();
while (!list_empty(page_list)) {
struct address_space *mapping;
struct page *page;
*/
__clear_page_locked(page);
free_it:
- mem_cgroup_uncharge(page);
nr_reclaimed++;
/*
list_add(&page->lru, &ret_pages);
VM_BUG_ON_PAGE(PageLRU(page) || PageUnevictable(page), page);
}
- mem_cgroup_uncharge_end();
+ mem_cgroup_uncharge_list(&free_pages);
free_hot_cold_page_list(&free_pages, true);
list_splice(&ret_pages, page_list);
__ClearPageActive(page);
del_page_from_lru_list(page, lruvec, lru);
- mem_cgroup_uncharge(page);
-
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
+ mem_cgroup_uncharge(page);
(*get_compound_page_dtor(page))(page);
spin_lock_irq(&zone->lru_lock);
} else
spin_unlock_irq(&zone->lru_lock);
+ mem_cgroup_uncharge_list(&page_list);
free_hot_cold_page_list(&page_list, true);
/*
__ClearPageActive(page);
del_page_from_lru_list(page, lruvec, lru);
- mem_cgroup_uncharge(page);
-
if (unlikely(PageCompound(page))) {
spin_unlock_irq(&zone->lru_lock);
+ mem_cgroup_uncharge(page);
(*get_compound_page_dtor(page))(page);
spin_lock_irq(&zone->lru_lock);
} else
__mod_zone_page_state(zone, NR_ISOLATED_ANON + file, -nr_taken);
spin_unlock_irq(&zone->lru_lock);
+ mem_cgroup_uncharge_list(&l_hold);
free_hot_cold_page_list(&l_hold, true);
}
projects / cascardo / linux.git / commitdiff