Messages in this thread Patch in this message | | | From | daniel.m.jordan@oracle ... | Subject | [RFC PATCH v1 06/13] mm: add lru_[un]lock_all APIs | Date | Wed, 31 Jan 2018 18:04:06 -0500 |
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Add heavy locking API's for the few cases that a thread needs exclusive access to an LRU list. This locks lru_lock as well as every lock in lru_batch_locks.
This API will be used often at first, in scaffolding code, to ease the transition from using lru_lock to the batch locking scheme. Later it will be rarely needed.
Signed-off-by: Daniel Jordan <daniel.m.jordan@oracle.com> --- include/linux/mm_inline.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+)
diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h index ec8b966a1c76..1f1657c75b1b 100644 --- a/include/linux/mm_inline.h +++ b/include/linux/mm_inline.h @@ -178,6 +178,38 @@ static __always_inline void move_page_to_lru_list_tail(struct page *page, __add_page_to_lru_list_tail(page, lruvec, lru); } +static __always_inline void lru_lock_all(struct pglist_data *pgdat, + unsigned long *flags) +{ + size_t i; + + if (flags) + local_irq_save(*flags); + else + local_irq_disable(); + + for (i = 0; i < NUM_LRU_BATCH_LOCKS; ++i) + spin_lock(&pgdat->lru_batch_locks[i].lock); + + spin_lock(&pgdat->lru_lock); +} + +static __always_inline void lru_unlock_all(struct pglist_data *pgdat, + unsigned long *flags) +{ + int i; + + spin_unlock(&pgdat->lru_lock); + + for (i = NUM_LRU_BATCH_LOCKS - 1; i >= 0; --i) + spin_unlock(&pgdat->lru_batch_locks[i].lock); + + if (flags) + local_irq_restore(*flags); + else + local_irq_enable(); +} + /** * page_lru_base_type - which LRU list type should a page be on? * @page: the page to test -- 2.16.1
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