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Date: Fri, 23 Sep 2016 09:53:52 +0800 From: zhong jiang <zhongjiang@...wei.com> To: Mike Kravetz <mike.kravetz@...cle.com>, Michal Hocko <mhocko@...nel.org>, David Rientjes <rientjes@...gle.com>, Vlastimil Babka <vbabka@...e.cz>, "Hugh Dickins" <hughd@...gle.com> CC: Linux Memory Management List <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org> Subject: [RFC] remove unnecessary condition in remove_inode_hugepages At present, we need to call hugetlb_fix_reserve_count when hugetlb_unrserve_pages fails, and PagePrivate will decide hugetlb reserves counts. we obtain the page from page cache. and use page both lock_page and mutex_lock. alloc_huge_page add page to page chace always hold lock page, then bail out clearpageprivate before unlock page. but I' m not sure it is right or I miss the points. diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c index 4ea71eb..010723b 100644 --- a/fs/hugetlbfs/inode.c +++ b/fs/hugetlbfs/inode.c @@ -462,14 +462,12 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart, * the page, note PagePrivate which is used in case * of error. */ - rsv_on_error = !PagePrivate(page); remove_huge_page(page); freed++; if (!truncate_op) { if (unlikely(hugetlb_unreserve_pages(inode, next, next + 1, 1))) - hugetlb_fix_reserve_counts(inode, - rsv_on_error); + hugetlb_fix_reserve_counts(inode) } unlock_page(page); diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h index c26d463..d2e0fc5 100644 --- a/include/linux/hugetlb.h +++ b/include/linux/hugetlb.h @@ -90,7 +90,7 @@ int dequeue_hwpoisoned_huge_page(struct page *page); bool isolate_huge_page(struct page *page, struct list_head *list); void putback_active_hugepage(struct page *page); void free_huge_page(struct page *page); -void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve); +void hugetlb_fix_reserve_counts(struct inode *inode); extern struct mutex *hugetlb_fault_mutex_table; u32 hugetlb_fault_mutex_hash(struct hstate *h, struct mm_struct *mm, struct vm_area_struct *vma, diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 87e11d8..28a079a 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -567,13 +567,13 @@ retry: * appear as a "reserved" entry instead of simply dangling with incorrect * counts. */ -void hugetlb_fix_reserve_counts(struct inode *inode, bool restore_reserve) +void hugetlb_fix_reserve_counts(struct inode *inode) { struct hugepage_subpool *spool = subpool_inode(inode); long rsv_adjust; rsv_adjust = hugepage_subpool_get_pages(spool, 1); - if (restore_reserve && rsv_adjust) { + if (rsv_adjust) { struct hstate *h = hstate_inode(inode); hugetlb_acct_memory(h, 1);
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