summaryrefslogtreecommitdiff
path: root/mm
diff options
context:
space:
mode:
Diffstat (limited to 'mm')
-rw-r--r--mm/hugetlb.c10
-rw-r--r--mm/kasan/quarantine.c7
-rw-r--r--mm/memcontrol.c12
-rw-r--r--mm/memory-failure.c158
-rw-r--r--mm/mmap.c8
-rw-r--r--mm/mmu_notifier.c14
-rw-r--r--mm/nommu.c2
-rw-r--r--mm/oom_kill.c54
-rw-r--r--mm/page_alloc.c2
-rw-r--r--mm/userfaultfd.c15
-rw-r--r--mm/util.c11
-rw-r--r--mm/vmalloc.c36
-rw-r--r--mm/workingset.c2
13 files changed, 240 insertions, 91 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f8ca7cca3c1a..3fc721789743 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -6785,6 +6785,16 @@ int get_hwpoison_huge_page(struct page *page, bool *hugetlb)
return ret;
}
+int get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+{
+ int ret;
+
+ spin_lock_irq(&hugetlb_lock);
+ ret = __get_huge_page_for_hwpoison(pfn, flags);
+ spin_unlock_irq(&hugetlb_lock);
+ return ret;
+}
+
void putback_active_hugepage(struct page *page)
{
spin_lock_irq(&hugetlb_lock);
diff --git a/mm/kasan/quarantine.c b/mm/kasan/quarantine.c
index 08291ed33e93..0a9def8ce5e8 100644
--- a/mm/kasan/quarantine.c
+++ b/mm/kasan/quarantine.c
@@ -315,6 +315,13 @@ static void per_cpu_remove_cache(void *arg)
struct qlist_head *q;
q = this_cpu_ptr(&cpu_quarantine);
+ /*
+ * Ensure the ordering between the writing to q->offline and
+ * per_cpu_remove_cache. Prevent cpu_quarantine from being corrupted
+ * by interrupt.
+ */
+ if (READ_ONCE(q->offline))
+ return;
qlist_move_cache(q, &to_free, cache);
qlist_free_all(&to_free, cache);
}
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 725f76723220..598fece89e2b 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -587,6 +587,9 @@ static DECLARE_DEFERRABLE_WORK(stats_flush_dwork, flush_memcg_stats_dwork);
static DEFINE_SPINLOCK(stats_flush_lock);
static DEFINE_PER_CPU(unsigned int, stats_updates);
static atomic_t stats_flush_threshold = ATOMIC_INIT(0);
+static u64 flush_next_time;
+
+#define FLUSH_TIME (2UL*HZ)
/*
* Accessors to ensure that preemption is disabled on PREEMPT_RT because it can
@@ -637,6 +640,7 @@ static void __mem_cgroup_flush_stats(void)
if (!spin_trylock_irqsave(&stats_flush_lock, flag))
return;
+ flush_next_time = jiffies_64 + 2*FLUSH_TIME;
cgroup_rstat_flush_irqsafe(root_mem_cgroup->css.cgroup);
atomic_set(&stats_flush_threshold, 0);
spin_unlock_irqrestore(&stats_flush_lock, flag);
@@ -648,10 +652,16 @@ void mem_cgroup_flush_stats(void)
__mem_cgroup_flush_stats();
}
+void mem_cgroup_flush_stats_delayed(void)
+{
+ if (time_after64(jiffies_64, flush_next_time))
+ mem_cgroup_flush_stats();
+}
+
static void flush_memcg_stats_dwork(struct work_struct *w)
{
__mem_cgroup_flush_stats();
- queue_delayed_work(system_unbound_wq, &stats_flush_dwork, 2UL*HZ);
+ queue_delayed_work(system_unbound_wq, &stats_flush_dwork, FLUSH_TIME);
}
/**
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index dcb6bb9cf731..27760c19bad7 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -1498,50 +1498,113 @@ static int try_to_split_thp_page(struct page *page, const char *msg)
return 0;
}
-static int memory_failure_hugetlb(unsigned long pfn, int flags)
+/*
+ * Called from hugetlb code with hugetlb_lock held.
+ *
+ * Return values:
+ * 0 - free hugepage
+ * 1 - in-use hugepage
+ * 2 - not a hugepage
+ * -EBUSY - the hugepage is busy (try to retry)
+ * -EHWPOISON - the hugepage is already hwpoisoned
+ */
+int __get_huge_page_for_hwpoison(unsigned long pfn, int flags)
+{
+ struct page *page = pfn_to_page(pfn);
+ struct page *head = compound_head(page);
+ int ret = 2; /* fallback to normal page handling */
+ bool count_increased = false;
+
+ if (!PageHeadHuge(head))
+ goto out;
+
+ if (flags & MF_COUNT_INCREASED) {
+ ret = 1;
+ count_increased = true;
+ } else if (HPageFreed(head) || HPageMigratable(head)) {
+ ret = get_page_unless_zero(head);
+ if (ret)
+ count_increased = true;
+ } else {
+ ret = -EBUSY;
+ goto out;
+ }
+
+ if (TestSetPageHWPoison(head)) {
+ ret = -EHWPOISON;
+ goto out;
+ }
+
+ return ret;
+out:
+ if (count_increased)
+ put_page(head);
+ return ret;
+}
+
+#ifdef CONFIG_HUGETLB_PAGE
+/*
+ * Taking refcount of hugetlb pages needs extra care about race conditions
+ * with basic operations like hugepage allocation/free/demotion.
+ * So some of prechecks for hwpoison (pinning, and testing/setting
+ * PageHWPoison) should be done in single hugetlb_lock range.
+ */
+static int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb)
{
- struct page *p = pfn_to_page(pfn);
- struct page *head = compound_head(p);
int res;
+ struct page *p = pfn_to_page(pfn);
+ struct page *head;
unsigned long page_flags;
+ bool retry = true;
- if (TestSetPageHWPoison(head)) {
- pr_err("Memory failure: %#lx: already hardware poisoned\n",
- pfn);
- res = -EHWPOISON;
- if (flags & MF_ACTION_REQUIRED)
+ *hugetlb = 1;
+retry:
+ res = get_huge_page_for_hwpoison(pfn, flags);
+ if (res == 2) { /* fallback to normal page handling */
+ *hugetlb = 0;
+ return 0;
+ } else if (res == -EHWPOISON) {
+ pr_err("Memory failure: %#lx: already hardware poisoned\n", pfn);
+ if (flags & MF_ACTION_REQUIRED) {
+ head = compound_head(p);
res = kill_accessing_process(current, page_to_pfn(head), flags);
+ }
+ return res;
+ } else if (res == -EBUSY) {
+ if (retry) {
+ retry = false;
+ goto retry;
+ }
+ action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
return res;
}
+ head = compound_head(p);
+ lock_page(head);
+
+ if (hwpoison_filter(p)) {
+ ClearPageHWPoison(head);
+ res = -EOPNOTSUPP;
+ goto out;
+ }
+
num_poisoned_pages_inc();
- if (!(flags & MF_COUNT_INCREASED)) {
- res = get_hwpoison_page(p, flags);
- if (!res) {
- lock_page(head);
- if (hwpoison_filter(p)) {
- if (TestClearPageHWPoison(head))
- num_poisoned_pages_dec();
- unlock_page(head);
- return -EOPNOTSUPP;
- }
- unlock_page(head);
- res = MF_FAILED;
- if (__page_handle_poison(p)) {
- page_ref_inc(p);
- res = MF_RECOVERED;
- }
- action_result(pfn, MF_MSG_FREE_HUGE, res);
- return res == MF_RECOVERED ? 0 : -EBUSY;
- } else if (res < 0) {
- action_result(pfn, MF_MSG_UNKNOWN, MF_IGNORED);
- return -EBUSY;
+ /*
+ * Handling free hugepage. The possible race with hugepage allocation
+ * or demotion can be prevented by PageHWPoison flag.
+ */
+ if (res == 0) {
+ unlock_page(head);
+ res = MF_FAILED;
+ if (__page_handle_poison(p)) {
+ page_ref_inc(p);
+ res = MF_RECOVERED;
}
+ action_result(pfn, MF_MSG_FREE_HUGE, res);
+ return res == MF_RECOVERED ? 0 : -EBUSY;
}
- lock_page(head);
-
/*
* The page could have changed compound pages due to race window.
* If this happens just bail out.
@@ -1554,14 +1617,6 @@ static int memory_failure_hugetlb(unsigned long pfn, int flags)
page_flags = head->flags;
- if (hwpoison_filter(p)) {
- if (TestClearPageHWPoison(head))
- num_poisoned_pages_dec();
- put_page(p);
- res = -EOPNOTSUPP;
- goto out;
- }
-
/*
* TODO: hwpoison for pud-sized hugetlb doesn't work right now, so
* simply disable it. In order to make it work properly, we need
@@ -1588,6 +1643,12 @@ out:
unlock_page(head);
return res;
}
+#else
+static inline int try_memory_failure_hugetlb(unsigned long pfn, int flags, int *hugetlb)
+{
+ return 0;
+}
+#endif
static int memory_failure_dev_pagemap(unsigned long pfn, int flags,
struct dev_pagemap *pgmap)
@@ -1712,6 +1773,7 @@ int memory_failure(unsigned long pfn, int flags)
int res = 0;
unsigned long page_flags;
bool retry = true;
+ int hugetlb = 0;
if (!sysctl_memory_failure_recovery)
panic("Memory failure on page %lx", pfn);
@@ -1739,10 +1801,9 @@ int memory_failure(unsigned long pfn, int flags)
}
try_again:
- if (PageHuge(p)) {
- res = memory_failure_hugetlb(pfn, flags);
+ res = try_memory_failure_hugetlb(pfn, flags, &hugetlb);
+ if (hugetlb)
goto unlock_mutex;
- }
if (TestSetPageHWPoison(p)) {
pr_err("Memory failure: %#lx: already hardware poisoned\n",
@@ -1800,6 +1861,19 @@ try_again:
if (PageTransHuge(hpage)) {
/*
+ * Bail out before SetPageHasHWPoisoned() if hpage is
+ * huge_zero_page, although PG_has_hwpoisoned is not
+ * checked in set_huge_zero_page().
+ *
+ * TODO: Handle memory failure of huge_zero_page thoroughly.
+ */
+ if (is_huge_zero_page(hpage)) {
+ action_result(pfn, MF_MSG_UNSPLIT_THP, MF_IGNORED);
+ res = -EBUSY;
+ goto unlock_mutex;
+ }
+
+ /*
* The flag must be set after the refcount is bumped
* otherwise it may race with THP split.
* And the flag can't be set in get_hwpoison_page() since
diff --git a/mm/mmap.c b/mm/mmap.c
index 3aa839f81e63..313b57d55a63 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2117,14 +2117,6 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info)
return addr;
}
-#ifndef arch_get_mmap_end
-#define arch_get_mmap_end(addr) (TASK_SIZE)
-#endif
-
-#ifndef arch_get_mmap_base
-#define arch_get_mmap_base(addr, base) (base)
-#endif
-
/* Get an address range which is currently unmapped.
* For shmat() with addr=0.
*
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 459d195d2ff6..f45ff1b7626a 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -1036,6 +1036,18 @@ int mmu_interval_notifier_insert_locked(
}
EXPORT_SYMBOL_GPL(mmu_interval_notifier_insert_locked);
+static bool
+mmu_interval_seq_released(struct mmu_notifier_subscriptions *subscriptions,
+ unsigned long seq)
+{
+ bool ret;
+
+ spin_lock(&subscriptions->lock);
+ ret = subscriptions->invalidate_seq != seq;
+ spin_unlock(&subscriptions->lock);
+ return ret;
+}
+
/**
* mmu_interval_notifier_remove - Remove a interval notifier
* @interval_sub: Interval subscription to unregister
@@ -1083,7 +1095,7 @@ void mmu_interval_notifier_remove(struct mmu_interval_notifier *interval_sub)
lock_map_release(&__mmu_notifier_invalidate_range_start_map);
if (seq)
wait_event(subscriptions->wq,
- READ_ONCE(subscriptions->invalidate_seq) != seq);
+ mmu_interval_seq_released(subscriptions, seq));
/* pairs with mmgrab in mmu_interval_notifier_insert() */
mmdrop(mm);
diff --git a/mm/nommu.c b/mm/nommu.c
index 55a9e48a7a02..9d7afc2d959e 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -226,6 +226,8 @@ void *vmalloc(unsigned long size)
}
EXPORT_SYMBOL(vmalloc);
+void *vmalloc_huge(unsigned long size, gfp_t gfp_mask) __weak __alias(__vmalloc);
+
/*
* vzalloc - allocate virtually contiguous memory with zero fill
*
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 7ec38194f8e1..49d7df39b02d 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -632,7 +632,7 @@ done:
*/
set_bit(MMF_OOM_SKIP, &mm->flags);
- /* Drop a reference taken by wake_oom_reaper */
+ /* Drop a reference taken by queue_oom_reaper */
put_task_struct(tsk);
}
@@ -644,12 +644,12 @@ static int oom_reaper(void *unused)
struct task_struct *tsk = NULL;
wait_event_freezable(oom_reaper_wait, oom_reaper_list != NULL);
- spin_lock(&oom_reaper_lock);
+ spin_lock_irq(&oom_reaper_lock);
if (oom_reaper_list != NULL) {
tsk = oom_reaper_list;
oom_reaper_list = tsk->oom_reaper_list;
}
- spin_unlock(&oom_reaper_lock);
+ spin_unlock_irq(&oom_reaper_lock);
if (tsk)
oom_reap_task(tsk);
@@ -658,22 +658,48 @@ static int oom_reaper(void *unused)
return 0;
}
-static void wake_oom_reaper(struct task_struct *tsk)
+static void wake_oom_reaper(struct timer_list *timer)
{
- /* mm is already queued? */
- if (test_and_set_bit(MMF_OOM_REAP_QUEUED, &tsk->signal->oom_mm->flags))
- return;
+ struct task_struct *tsk = container_of(timer, struct task_struct,
+ oom_reaper_timer);
+ struct mm_struct *mm = tsk->signal->oom_mm;
+ unsigned long flags;
- get_task_struct(tsk);
+ /* The victim managed to terminate on its own - see exit_mmap */
+ if (test_bit(MMF_OOM_SKIP, &mm->flags)) {
+ put_task_struct(tsk);
+ return;
+ }
- spin_lock(&oom_reaper_lock);
+ spin_lock_irqsave(&oom_reaper_lock, flags);
tsk->oom_reaper_list = oom_reaper_list;
oom_reaper_list = tsk;
- spin_unlock(&oom_reaper_lock);
+ spin_unlock_irqrestore(&oom_reaper_lock, flags);
trace_wake_reaper(tsk->pid);
wake_up(&oom_reaper_wait);
}
+/*
+ * Give the OOM victim time to exit naturally before invoking the oom_reaping.
+ * The timers timeout is arbitrary... the longer it is, the longer the worst
+ * case scenario for the OOM can take. If it is too small, the oom_reaper can
+ * get in the way and release resources needed by the process exit path.
+ * e.g. The futex robust list can sit in Anon|Private memory that gets reaped
+ * before the exit path is able to wake the futex waiters.
+ */
+#define OOM_REAPER_DELAY (2*HZ)
+static void queue_oom_reaper(struct task_struct *tsk)
+{
+ /* mm is already queued? */
+ if (test_and_set_bit(MMF_OOM_REAP_QUEUED, &tsk->signal->oom_mm->flags))
+ return;
+
+ get_task_struct(tsk);
+ timer_setup(&tsk->oom_reaper_timer, wake_oom_reaper, 0);
+ tsk->oom_reaper_timer.expires = jiffies + OOM_REAPER_DELAY;
+ add_timer(&tsk->oom_reaper_timer);
+}
+
static int __init oom_init(void)
{
oom_reaper_th = kthread_run(oom_reaper, NULL, "oom_reaper");
@@ -681,7 +707,7 @@ static int __init oom_init(void)
}
subsys_initcall(oom_init)
#else
-static inline void wake_oom_reaper(struct task_struct *tsk)
+static inline void queue_oom_reaper(struct task_struct *tsk)
{
}
#endif /* CONFIG_MMU */
@@ -932,7 +958,7 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
rcu_read_unlock();
if (can_oom_reap)
- wake_oom_reaper(victim);
+ queue_oom_reaper(victim);
mmdrop(mm);
put_task_struct(victim);
@@ -968,7 +994,7 @@ static void oom_kill_process(struct oom_control *oc, const char *message)
task_lock(victim);
if (task_will_free_mem(victim)) {
mark_oom_victim(victim);
- wake_oom_reaper(victim);
+ queue_oom_reaper(victim);
task_unlock(victim);
put_task_struct(victim);
return;
@@ -1067,7 +1093,7 @@ bool out_of_memory(struct oom_control *oc)
*/
if (task_will_free_mem(current)) {
mark_oom_victim(current);
- wake_oom_reaper(current);
+ queue_oom_reaper(current);
return true;
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 33ca8cab21e6..0e42038382c1 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -8919,7 +8919,7 @@ void *__init alloc_large_system_hash(const char *tablename,
table = memblock_alloc_raw(size,
SMP_CACHE_BYTES);
} else if (get_order(size) >= MAX_ORDER || hashdist) {
- table = __vmalloc(size, gfp_flags);
+ table = vmalloc_huge(size, gfp_flags);
virt = true;
if (table)
huge = is_vm_area_hugepages(table);
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 0cb8e5ef1713..e9bb6db002aa 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -72,12 +72,15 @@ int mfill_atomic_install_pte(struct mm_struct *dst_mm, pmd_t *dst_pmd,
_dst_pte = pte_mkdirty(_dst_pte);
if (page_in_cache && !vm_shared)
writable = false;
- if (writable) {
- if (wp_copy)
- _dst_pte = pte_mkuffd_wp(_dst_pte);
- else
- _dst_pte = pte_mkwrite(_dst_pte);
- }
+
+ /*
+ * Always mark a PTE as write-protected when needed, regardless of
+ * VM_WRITE, which the user might change.
+ */
+ if (wp_copy)
+ _dst_pte = pte_mkuffd_wp(_dst_pte);
+ else if (writable)
+ _dst_pte = pte_mkwrite(_dst_pte);
dst_pte = pte_offset_map_lock(dst_mm, dst_pmd, dst_addr, &ptl);
diff --git a/mm/util.c b/mm/util.c
index 54e5e761a9a9..3492a9e81aa3 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -592,8 +592,15 @@ void *kvmalloc_node(size_t size, gfp_t flags, int node)
return NULL;
}
- return __vmalloc_node(size, 1, flags, node,
- __builtin_return_address(0));
+ /*
+ * kvmalloc() can always use VM_ALLOW_HUGE_VMAP,
+ * since the callers already cannot assume anything
+ * about the resulting pointer, and cannot play
+ * protection games.
+ */
+ return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
+ flags, PAGE_KERNEL, VM_ALLOW_HUGE_VMAP,
+ node, __builtin_return_address(0));
}
EXPORT_SYMBOL(kvmalloc_node);
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 07da85ae825b..cadfbb5155ea 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -2653,15 +2653,18 @@ static void __vunmap(const void *addr, int deallocate_pages)
vm_remove_mappings(area, deallocate_pages);
if (deallocate_pages) {
- unsigned int page_order = vm_area_page_order(area);
- int i, step = 1U << page_order;
+ int i;
- for (i = 0; i < area->nr_pages; i += step) {
+ for (i = 0; i < area->nr_pages; i++) {
struct page *page = area->pages[i];
BUG_ON(!page);
- mod_memcg_page_state(page, MEMCG_VMALLOC, -step);
- __free_pages(page, page_order);
+ mod_memcg_page_state(page, MEMCG_VMALLOC, -1);
+ /*
+ * High-order allocs for huge vmallocs are split, so
+ * can be freed as an array of order-0 allocations
+ */
+ __free_pages(page, 0);
cond_resched();
}
atomic_long_sub(area->nr_pages, &nr_vmalloc_pages);
@@ -2914,12 +2917,7 @@ vm_area_alloc_pages(gfp_t gfp, int nid,
if (nr != nr_pages_request)
break;
}
- } else
- /*
- * Compound pages required for remap_vmalloc_page if
- * high-order pages.
- */
- gfp |= __GFP_COMP;
+ }
/* High-order pages or fallback path if "bulk" fails. */
@@ -2933,6 +2931,15 @@ vm_area_alloc_pages(gfp_t gfp, int nid,
page = alloc_pages_node(nid, gfp, order);
if (unlikely(!page))
break;
+ /*
+ * Higher order allocations must be able to be treated as
+ * indepdenent small pages by callers (as they can with
+ * small-page vmallocs). Some drivers do their own refcounting
+ * on vmalloc_to_page() pages, some use page->mapping,
+ * page->lru, etc.
+ */
+ if (order)
+ split_page(page, order);
/*
* Careful, we allocate and map page-order pages, but
@@ -2992,11 +2999,10 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
atomic_long_add(area->nr_pages, &nr_vmalloc_pages);
if (gfp_mask & __GFP_ACCOUNT) {
- int i, step = 1U << page_order;
+ int i;
- for (i = 0; i < area->nr_pages; i += step)
- mod_memcg_page_state(area->pages[i], MEMCG_VMALLOC,
- step);
+ for (i = 0; i < area->nr_pages; i++)
+ mod_memcg_page_state(area->pages[i], MEMCG_VMALLOC, 1);
}
/*
diff --git a/mm/workingset.c b/mm/workingset.c
index 8a3828acc0bf..592569a8974c 100644
--- a/mm/workingset.c
+++ b/mm/workingset.c
@@ -355,7 +355,7 @@ void workingset_refault(struct folio *folio, void *shadow)
mod_lruvec_state(lruvec, WORKINGSET_REFAULT_BASE + file, nr);
- mem_cgroup_flush_stats();
+ mem_cgroup_flush_stats_delayed();
/*
* Compare the distance to the existing workingset size. We
* don't activate pages that couldn't stay resident even if
generated by cgit v1.2.3-70-g09d2 (git 2.47.1) at 2024-12-26 07:18:34 +0000