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mm: put_and_wait_on_page_locked() while page is migrated
Waiting on a page migration entry has used wait_on_page_locked() all along since 2006: but you cannot safely wait_on_page_locked() without holding a reference to the page, and that extra reference is enough to make migrate_page_move_mapping() fail with -EAGAIN, when a racing task faults on the entry before migrate_page_move_mapping() gets there. And that failure is retried nine times, amplifying the pain when trying to migrate a popular page. With a single persistent faulter, migration sometimes succeeds; with two or three concurrent faulters, success becomes much less likely (and the more the page was mapped, the worse the overhead of unmapping and remapping it on each try). This is especially a problem for memory offlining, where the outer level retries forever (or until terminated from userspace), because a heavy refault workload can trigger an endless loop of migration failures. wait_on_page_locked() is the wrong tool for the job. David Herrmann (but was he the first?) noticed this issue in 2014: https://marc.info/?l=linux-mm&m=140110465608116&w=2 Tim Chen started a thread in August 2017 which appears relevant: https://marc.info/?l=linux-mm&m=150275941014915&w=2 where Kan Liang went on to implicate __migration_entry_wait(): https://marc.info/?l=linux-mm&m=150300268411980&w=2 and the thread ended up with the v4.14 commits:2554db9165
("sched/wait: Break up long wake list walk")11a19c7b09
("sched/wait: Introduce wakeup boomark in wake_up_page_bit") Baoquan He reported "Memory hotplug softlock issue" 14 November 2018: https://marc.info/?l=linux-mm&m=154217936431300&w=2 We have all assumed that it is essential to hold a page reference while waiting on a page lock: partly to guarantee that there is still a struct page when MEMORY_HOTREMOVE is configured, but also to protect against reuse of the struct page going to someone who then holds the page locked indefinitely, when the waiter can reasonably expect timely unlocking. But in fact, so long as wait_on_page_bit_common() does the put_page(), and is careful not to rely on struct page contents thereafter, there is no need to hold a reference to the page while waiting on it. That does mean that this case cannot go back through the loop: but that's fine for the page migration case, and even if used more widely, is limited by the "Stop walking if it's locked" optimization in wake_page_function(). Add interface put_and_wait_on_page_locked() to do this, using "behavior" enum in place of "lock" arg to wait_on_page_bit_common() to implement it. No interruptible or killable variant needed yet, but they might follow: I have a vague notion that reporting -EINTR should take precedence over return from wait_on_page_bit_common() without knowing the page state, so arrange it accordingly - but that may be nothing but pedantic. __migration_entry_wait() still has to take a brief reference to the page, prior to calling put_and_wait_on_page_locked(): but now that it is dropped before waiting, the chance of impeding page migration is very much reduced. Should we perhaps disable preemption across this? shrink_page_list()'s __ClearPageLocked(): that was a surprise! This survived a lot of testing before that showed up. PageWaiters may have been set by wait_on_page_bit_common(), and the reference dropped, just before shrink_page_list() succeeds in freezing its last page reference: in such a case, unlock_page() must be used. Follow the suggestion from Michal Hocko, just reverta978d6f521
("mm: unlockless reclaim") now: that optimization predates PageWaiters, and won't buy much these days; but we can reinstate it for the !PageWaiters case if anyone notices. It does raise the question: should vmscan.c's is_page_cache_freeable() and __remove_mapping() now treat a PageWaiters page as if an extra reference were held? Perhaps, but I don't think it matters much, since shrink_page_list() already had to win its trylock_page(), so waiters are not very common there: I noticed no difference when trying the bigger change, and it's surely not needed while put_and_wait_on_page_locked() is only used for page migration. [willy@infradead.org: add put_and_wait_on_page_locked() kerneldoc] Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1811261121330.1116@eggly.anvils Signed-off-by: Hugh Dickins <hughd@google.com> Reported-by: Baoquan He <bhe@redhat.com> Tested-by: Baoquan He <bhe@redhat.com> Reviewed-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Matthew Wilcox <willy@infradead.org> Cc: Baoquan He <bhe@redhat.com> Cc: David Hildenbrand <david@redhat.com> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Herrmann <dh.herrmann@gmail.com> Cc: Tim Chen <tim.c.chen@linux.intel.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Christoph Lameter <cl@linux.com> Cc: Nick Piggin <npiggin@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -537,6 +537,8 @@ static inline int wait_on_page_locked_killable(struct page *page)
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return wait_on_page_bit_killable(compound_head(page), PG_locked);
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}
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extern void put_and_wait_on_page_locked(struct page *page);
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/*
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* Wait for a page to complete writeback
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*/
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89
mm/filemap.c
89
mm/filemap.c
@ -981,7 +981,14 @@ static int wake_page_function(wait_queue_entry_t *wait, unsigned mode, int sync,
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if (wait_page->bit_nr != key->bit_nr)
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return 0;
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/* Stop walking if it's locked */
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/*
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* Stop walking if it's locked.
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* Is this safe if put_and_wait_on_page_locked() is in use?
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* Yes: the waker must hold a reference to this page, and if PG_locked
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* has now already been set by another task, that task must also hold
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* a reference to the *same usage* of this page; so there is no need
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* to walk on to wake even the put_and_wait_on_page_locked() callers.
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*/
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if (test_bit(key->bit_nr, &key->page->flags))
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return -1;
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@ -1049,25 +1056,44 @@ static void wake_up_page(struct page *page, int bit)
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wake_up_page_bit(page, bit);
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}
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/*
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* A choice of three behaviors for wait_on_page_bit_common():
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*/
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enum behavior {
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EXCLUSIVE, /* Hold ref to page and take the bit when woken, like
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* __lock_page() waiting on then setting PG_locked.
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*/
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SHARED, /* Hold ref to page and check the bit when woken, like
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* wait_on_page_writeback() waiting on PG_writeback.
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*/
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DROP, /* Drop ref to page before wait, no check when woken,
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* like put_and_wait_on_page_locked() on PG_locked.
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*/
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};
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static inline int wait_on_page_bit_common(wait_queue_head_t *q,
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struct page *page, int bit_nr, int state, bool lock)
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struct page *page, int bit_nr, int state, enum behavior behavior)
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{
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struct wait_page_queue wait_page;
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wait_queue_entry_t *wait = &wait_page.wait;
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bool bit_is_set;
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bool thrashing = false;
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bool delayacct = false;
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unsigned long pflags;
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int ret = 0;
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if (bit_nr == PG_locked &&
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!PageUptodate(page) && PageWorkingset(page)) {
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if (!PageSwapBacked(page))
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if (!PageSwapBacked(page)) {
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delayacct_thrashing_start();
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delayacct = true;
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}
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psi_memstall_enter(&pflags);
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thrashing = true;
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}
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init_wait(wait);
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wait->flags = lock ? WQ_FLAG_EXCLUSIVE : 0;
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wait->flags = behavior == EXCLUSIVE ? WQ_FLAG_EXCLUSIVE : 0;
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wait->func = wake_page_function;
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wait_page.page = page;
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wait_page.bit_nr = bit_nr;
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@ -1084,14 +1110,17 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q,
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spin_unlock_irq(&q->lock);
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if (likely(test_bit(bit_nr, &page->flags))) {
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io_schedule();
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}
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bit_is_set = test_bit(bit_nr, &page->flags);
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if (behavior == DROP)
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put_page(page);
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if (lock) {
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if (likely(bit_is_set))
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io_schedule();
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if (behavior == EXCLUSIVE) {
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if (!test_and_set_bit_lock(bit_nr, &page->flags))
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break;
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} else {
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} else if (behavior == SHARED) {
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if (!test_bit(bit_nr, &page->flags))
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break;
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}
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@ -1100,12 +1129,23 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q,
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ret = -EINTR;
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break;
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}
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if (behavior == DROP) {
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/*
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* We can no longer safely access page->flags:
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* even if CONFIG_MEMORY_HOTREMOVE is not enabled,
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* there is a risk of waiting forever on a page reused
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* for something that keeps it locked indefinitely.
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* But best check for -EINTR above before breaking.
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*/
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break;
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}
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}
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finish_wait(q, wait);
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if (thrashing) {
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if (!PageSwapBacked(page))
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if (delayacct)
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delayacct_thrashing_end();
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psi_memstall_leave(&pflags);
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}
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@ -1124,17 +1164,36 @@ static inline int wait_on_page_bit_common(wait_queue_head_t *q,
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void wait_on_page_bit(struct page *page, int bit_nr)
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{
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wait_queue_head_t *q = page_waitqueue(page);
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wait_on_page_bit_common(q, page, bit_nr, TASK_UNINTERRUPTIBLE, false);
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wait_on_page_bit_common(q, page, bit_nr, TASK_UNINTERRUPTIBLE, SHARED);
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}
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EXPORT_SYMBOL(wait_on_page_bit);
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int wait_on_page_bit_killable(struct page *page, int bit_nr)
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{
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wait_queue_head_t *q = page_waitqueue(page);
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return wait_on_page_bit_common(q, page, bit_nr, TASK_KILLABLE, false);
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return wait_on_page_bit_common(q, page, bit_nr, TASK_KILLABLE, SHARED);
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}
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EXPORT_SYMBOL(wait_on_page_bit_killable);
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/**
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* put_and_wait_on_page_locked - Drop a reference and wait for it to be unlocked
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* @page: The page to wait for.
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*
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* The caller should hold a reference on @page. They expect the page to
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* become unlocked relatively soon, but do not wish to hold up migration
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* (for example) by holding the reference while waiting for the page to
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* come unlocked. After this function returns, the caller should not
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* dereference @page.
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*/
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void put_and_wait_on_page_locked(struct page *page)
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{
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wait_queue_head_t *q;
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page = compound_head(page);
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q = page_waitqueue(page);
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wait_on_page_bit_common(q, page, PG_locked, TASK_UNINTERRUPTIBLE, DROP);
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}
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/**
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* add_page_wait_queue - Add an arbitrary waiter to a page's wait queue
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* @page: Page defining the wait queue of interest
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@ -1264,7 +1323,8 @@ void __lock_page(struct page *__page)
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{
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struct page *page = compound_head(__page);
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wait_queue_head_t *q = page_waitqueue(page);
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wait_on_page_bit_common(q, page, PG_locked, TASK_UNINTERRUPTIBLE, true);
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wait_on_page_bit_common(q, page, PG_locked, TASK_UNINTERRUPTIBLE,
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EXCLUSIVE);
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}
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EXPORT_SYMBOL(__lock_page);
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@ -1272,7 +1332,8 @@ int __lock_page_killable(struct page *__page)
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{
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struct page *page = compound_head(__page);
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wait_queue_head_t *q = page_waitqueue(page);
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return wait_on_page_bit_common(q, page, PG_locked, TASK_KILLABLE, true);
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return wait_on_page_bit_common(q, page, PG_locked, TASK_KILLABLE,
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EXCLUSIVE);
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}
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EXPORT_SYMBOL_GPL(__lock_page_killable);
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@ -1490,8 +1490,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd)
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if (!get_page_unless_zero(page))
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goto out_unlock;
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spin_unlock(vmf->ptl);
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wait_on_page_locked(page);
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put_page(page);
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put_and_wait_on_page_locked(page);
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goto out;
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}
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@ -1527,8 +1526,7 @@ vm_fault_t do_huge_pmd_numa_page(struct vm_fault *vmf, pmd_t pmd)
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if (!get_page_unless_zero(page))
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goto out_unlock;
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spin_unlock(vmf->ptl);
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wait_on_page_locked(page);
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put_page(page);
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put_and_wait_on_page_locked(page);
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goto out;
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}
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12
mm/migrate.c
12
mm/migrate.c
@ -327,16 +327,13 @@ void __migration_entry_wait(struct mm_struct *mm, pte_t *ptep,
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/*
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* Once page cache replacement of page migration started, page_count
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* *must* be zero. And, we don't want to call wait_on_page_locked()
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* against a page without get_page().
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* So, we use get_page_unless_zero(), here. Even failed, page fault
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* will occur again.
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* is zero; but we must not call put_and_wait_on_page_locked() without
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* a ref. Use get_page_unless_zero(), and just fault again if it fails.
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*/
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if (!get_page_unless_zero(page))
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goto out;
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pte_unmap_unlock(ptep, ptl);
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wait_on_page_locked(page);
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put_page(page);
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put_and_wait_on_page_locked(page);
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return;
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out:
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pte_unmap_unlock(ptep, ptl);
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@ -370,8 +367,7 @@ void pmd_migration_entry_wait(struct mm_struct *mm, pmd_t *pmd)
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if (!get_page_unless_zero(page))
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goto unlock;
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spin_unlock(ptl);
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wait_on_page_locked(page);
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put_page(page);
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put_and_wait_on_page_locked(page);
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return;
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unlock:
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spin_unlock(ptl);
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10
mm/vmscan.c
10
mm/vmscan.c
@ -1460,14 +1460,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
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count_memcg_page_event(page, PGLAZYFREED);
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} else if (!mapping || !__remove_mapping(mapping, page, true))
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goto keep_locked;
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/*
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* At this point, we have no other references and there is
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* no way to pick any more up (removed from LRU, removed
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* from pagecache). Can use non-atomic bitops now (and
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* we obviously don't have to worry about waking up a process
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* waiting on the page lock, because there are no references.
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*/
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__ClearPageLocked(page);
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unlock_page(page);
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free_it:
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nr_reclaimed++;
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