mm/munlock: maintain page->mlock_count while unevictable

Previous patches have been preparatory: now implement page->mlock_count.
The ordering of the "Unevictable LRU" is of no significance, and there is
no point holding unevictable pages on a list: place page->mlock_count to
overlay page->lru.prev (since page->lru.next is overlaid by compound_head,
which needs to be even so as not to satisfy PageTail - though 2 could be
added instead of 1 for each mlock, if that's ever an improvement).

But it's only safe to rely on or modify page->mlock_count while lruvec
lock is held and page is on unevictable "LRU" - we can save lots of edits
by continuing to pretend that there's an imaginary LRU here (there is an
unevictable count which still needs to be maintained, but not a list).

The mlock_count technique suffers from an unreliability much like with
page_mlock(): while someone else has the page off LRU, not much can
be done.  As before, err on the safe side (behave as if mlock_count 0),
and let try_to_unlock_one() move the page to unevictable if reclaim finds
out later on - a few misplaced pages don't matter, what we want to avoid
is imbalancing reclaim by flooding evictable lists with unevictable pages.

I am not a fan of "if (!isolate_lru_page(page)) putback_lru_page(page);":
if we have taken lruvec lock to get the page off its present list, then
we save everyone trouble (and however many extra atomic ops) by putting
it on its destination list immediately.

Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
This commit is contained in:
Hugh Dickins 2022-02-14 18:29:54 -08:00 committed by Matthew Wilcox (Oracle)
parent b109b87050
commit 07ca760673
7 changed files with 93 additions and 23 deletions

View file

@ -99,7 +99,8 @@ void lruvec_add_folio(struct lruvec *lruvec, struct folio *folio)
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
list_add(&folio->lru, &lruvec->lists[lru]);
if (lru != LRU_UNEVICTABLE)
list_add(&folio->lru, &lruvec->lists[lru]);
}
static __always_inline void add_page_to_lru_list(struct page *page,
@ -115,6 +116,7 @@ void lruvec_add_folio_tail(struct lruvec *lruvec, struct folio *folio)
update_lru_size(lruvec, lru, folio_zonenum(folio),
folio_nr_pages(folio));
/* This is not expected to be used on LRU_UNEVICTABLE */
list_add_tail(&folio->lru, &lruvec->lists[lru]);
}
@ -127,8 +129,11 @@ static __always_inline void add_page_to_lru_list_tail(struct page *page,
static __always_inline
void lruvec_del_folio(struct lruvec *lruvec, struct folio *folio)
{
list_del(&folio->lru);
update_lru_size(lruvec, folio_lru_list(folio), folio_zonenum(folio),
enum lru_list lru = folio_lru_list(folio);
if (lru != LRU_UNEVICTABLE)
list_del(&folio->lru);
update_lru_size(lruvec, lru, folio_zonenum(folio),
-folio_nr_pages(folio));
}

View file

@ -85,7 +85,16 @@ struct page {
* lruvec->lru_lock. Sometimes used as a generic list
* by the page owner.
*/
struct list_head lru;
union {
struct list_head lru;
/* Or, for the Unevictable "LRU list" slot */
struct {
/* Always even, to negate PageTail */
void *__filler;
/* Count page's or folio's mlocks */
unsigned int mlock_count;
};
};
/* See page-flags.h for PAGE_MAPPING_FLAGS */
struct address_space *mapping;
pgoff_t index; /* Our offset within mapping. */
@ -241,7 +250,13 @@ struct folio {
struct {
/* public: */
unsigned long flags;
struct list_head lru;
union {
struct list_head lru;
struct {
void *__filler;
unsigned int mlock_count;
};
};
struct address_space *mapping;
pgoff_t index;
void *private;

View file

@ -2300,8 +2300,11 @@ static void lru_add_page_tail(struct page *head, struct page *tail,
} else {
/* head is still on lru (and we have it frozen) */
VM_WARN_ON(!PageLRU(head));
if (PageUnevictable(tail))
tail->mlock_count = 0;
else
list_add_tail(&tail->lru, &head->lru);
SetPageLRU(tail);
list_add_tail(&tail->lru, &head->lru);
}
}

View file

@ -1257,8 +1257,7 @@ struct lruvec *folio_lruvec_lock_irqsave(struct folio *folio,
* @nr_pages: positive when adding or negative when removing
*
* This function must be called under lru_lock, just before a page is added
* to or just after a page is removed from an lru list (that ordering being
* so as to allow it to check that lru_size 0 is consistent with list_empty).
* to or just after a page is removed from an lru list.
*/
void mem_cgroup_update_lru_size(struct lruvec *lruvec, enum lru_list lru,
int zid, int nr_pages)

View file

@ -54,16 +54,35 @@ EXPORT_SYMBOL(can_do_mlock);
*/
void mlock_page(struct page *page)
{
struct lruvec *lruvec;
int nr_pages = thp_nr_pages(page);
VM_BUG_ON_PAGE(PageTail(page), page);
if (!TestSetPageMlocked(page)) {
int nr_pages = thp_nr_pages(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, nr_pages);
count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
if (!isolate_lru_page(page))
putback_lru_page(page);
__count_vm_events(UNEVICTABLE_PGMLOCKED, nr_pages);
}
/* There is nothing more we can do while it's off LRU */
if (!TestClearPageLRU(page))
return;
lruvec = folio_lruvec_lock_irq(page_folio(page));
if (PageUnevictable(page)) {
page->mlock_count++;
goto out;
}
del_page_from_lru_list(page, lruvec);
ClearPageActive(page);
SetPageUnevictable(page);
page->mlock_count = 1;
add_page_to_lru_list(page, lruvec);
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
out:
SetPageLRU(page);
unlock_page_lruvec_irq(lruvec);
}
/**
@ -72,19 +91,40 @@ void mlock_page(struct page *page)
*/
void munlock_page(struct page *page)
{
struct lruvec *lruvec;
int nr_pages = thp_nr_pages(page);
VM_BUG_ON_PAGE(PageTail(page), page);
if (TestClearPageMlocked(page)) {
int nr_pages = thp_nr_pages(page);
mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
if (!isolate_lru_page(page)) {
putback_lru_page(page);
count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
} else if (PageUnevictable(page)) {
count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
}
lock_page_memcg(page);
lruvec = folio_lruvec_lock_irq(page_folio(page));
if (PageLRU(page) && PageUnevictable(page)) {
/* Then mlock_count is maintained, but might undercount */
if (page->mlock_count)
page->mlock_count--;
if (page->mlock_count)
goto out;
}
/* else assume that was the last mlock: reclaim will fix it if not */
if (TestClearPageMlocked(page)) {
__mod_zone_page_state(page_zone(page), NR_MLOCK, -nr_pages);
if (PageLRU(page) || !PageUnevictable(page))
__count_vm_events(UNEVICTABLE_PGMUNLOCKED, nr_pages);
else
__count_vm_events(UNEVICTABLE_PGSTRANDED, nr_pages);
}
/* page_evictable() has to be checked *after* clearing Mlocked */
if (PageLRU(page) && PageUnevictable(page) && page_evictable(page)) {
del_page_from_lru_list(page, lruvec);
ClearPageUnevictable(page);
add_page_to_lru_list(page, lruvec);
__count_vm_events(UNEVICTABLE_PGRESCUED, nr_pages);
}
out:
unlock_page_lruvec_irq(lruvec);
unlock_page_memcg(page);
}
/*

View file

@ -81,6 +81,13 @@ void lruvec_init(struct lruvec *lruvec)
for_each_lru(lru)
INIT_LIST_HEAD(&lruvec->lists[lru]);
/*
* The "Unevictable LRU" is imaginary: though its size is maintained,
* it is never scanned, and unevictable pages are not threaded on it
* (so that their lru fields can be reused to hold mlock_count).
* Poison its list head, so that any operations on it would crash.
*/
list_del(&lruvec->lists[LRU_UNEVICTABLE]);
}
#if defined(CONFIG_NUMA_BALANCING) && !defined(LAST_CPUPID_NOT_IN_PAGE_FLAGS)

View file

@ -1062,6 +1062,7 @@ static void __pagevec_lru_add_fn(struct folio *folio, struct lruvec *lruvec)
} else {
folio_clear_active(folio);
folio_set_unevictable(folio);
folio->mlock_count = !!folio_test_mlocked(folio);
if (!was_unevictable)
__count_vm_events(UNEVICTABLE_PGCULLED, nr_pages);
}