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author | Mike Rapoport <rppt@linux.vnet.ibm.com> | 2017-09-06 16:22:59 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-09-06 17:27:28 -0700 |
commit | 0f0796945614b7523987f7eea32407421af4b1ee (patch) | |
tree | a83e72e957a4e696df87462882d2f239f7a9c608 /mm/shmem.c | |
parent | b1cc94ab2f2ba31fcb2c59df0b9cf03f6d720553 (diff) | |
download | linux-0f0796945614b7523987f7eea32407421af4b1ee.tar.gz linux-0f0796945614b7523987f7eea32407421af4b1ee.tar.bz2 linux-0f0796945614b7523987f7eea32407421af4b1ee.zip |
shmem: introduce shmem_inode_acct_block
The shmem_acct_block and the update of used_blocks are following one
another in all the places they are used. Combine these two into a
helper function.
Link: http://lkml.kernel.org/r/1497939652-16528-3-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Hillf Danton <hillf.zj@alibaba-inc.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/shmem.c')
-rw-r--r-- | mm/shmem.c | 102 |
1 files changed, 46 insertions, 56 deletions
diff --git a/mm/shmem.c b/mm/shmem.c index 35b524085c44..b7d84c4f2a5c 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -188,6 +188,38 @@ static inline void shmem_unacct_blocks(unsigned long flags, long pages) vm_unacct_memory(pages * VM_ACCT(PAGE_SIZE)); } +static inline bool shmem_inode_acct_block(struct inode *inode, long pages) +{ + struct shmem_inode_info *info = SHMEM_I(inode); + struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + + if (shmem_acct_block(info->flags, pages)) + return false; + + if (sbinfo->max_blocks) { + if (percpu_counter_compare(&sbinfo->used_blocks, + sbinfo->max_blocks - pages) > 0) + goto unacct; + percpu_counter_add(&sbinfo->used_blocks, pages); + } + + return true; + +unacct: + shmem_unacct_blocks(info->flags, pages); + return false; +} + +static inline void shmem_inode_unacct_blocks(struct inode *inode, long pages) +{ + struct shmem_inode_info *info = SHMEM_I(inode); + struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); + + if (sbinfo->max_blocks) + percpu_counter_sub(&sbinfo->used_blocks, pages); + shmem_unacct_blocks(info->flags, pages); +} + static const struct super_operations shmem_ops; static const struct address_space_operations shmem_aops; static const struct file_operations shmem_file_operations; @@ -249,31 +281,20 @@ static void shmem_recalc_inode(struct inode *inode) freed = info->alloced - info->swapped - inode->i_mapping->nrpages; if (freed > 0) { - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -freed); info->alloced -= freed; inode->i_blocks -= freed * BLOCKS_PER_PAGE; - shmem_unacct_blocks(info->flags, freed); + shmem_inode_unacct_blocks(inode, freed); } } bool shmem_charge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); unsigned long flags; - if (shmem_acct_block(info->flags, pages)) + if (!shmem_inode_acct_block(inode, pages)) return false; - if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, - sbinfo->max_blocks - pages) > 0) - goto unacct; - percpu_counter_add(&sbinfo->used_blocks, pages); - } - spin_lock_irqsave(&info->lock, flags); info->alloced += pages; inode->i_blocks += pages * BLOCKS_PER_PAGE; @@ -282,16 +303,11 @@ bool shmem_charge(struct inode *inode, long pages) inode->i_mapping->nrpages += pages; return true; - -unacct: - shmem_unacct_blocks(info->flags, pages); - return false; } void shmem_uncharge(struct inode *inode, long pages) { struct shmem_inode_info *info = SHMEM_I(inode); - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); unsigned long flags; spin_lock_irqsave(&info->lock, flags); @@ -300,9 +316,7 @@ void shmem_uncharge(struct inode *inode, long pages) shmem_recalc_inode(inode); spin_unlock_irqrestore(&info->lock, flags); - if (sbinfo->max_blocks) - percpu_counter_sub(&sbinfo->used_blocks, pages); - shmem_unacct_blocks(info->flags, pages); + shmem_inode_unacct_blocks(inode, pages); } /* @@ -1451,9 +1465,10 @@ static struct page *shmem_alloc_page(gfp_t gfp, } static struct page *shmem_alloc_and_acct_page(gfp_t gfp, - struct shmem_inode_info *info, struct shmem_sb_info *sbinfo, + struct inode *inode, pgoff_t index, bool huge) { + struct shmem_inode_info *info = SHMEM_I(inode); struct page *page; int nr; int err = -ENOSPC; @@ -1462,14 +1477,8 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, huge = false; nr = huge ? HPAGE_PMD_NR : 1; - if (shmem_acct_block(info->flags, nr)) + if (!shmem_inode_acct_block(inode, nr)) goto failed; - if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, - sbinfo->max_blocks - nr) > 0) - goto unacct; - percpu_counter_add(&sbinfo->used_blocks, nr); - } if (huge) page = shmem_alloc_hugepage(gfp, info, index); @@ -1482,10 +1491,7 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, } err = -ENOMEM; - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -nr); -unacct: - shmem_unacct_blocks(info->flags, nr); + shmem_inode_unacct_blocks(inode, nr); failed: return ERR_PTR(err); } @@ -1750,10 +1756,9 @@ repeat: } alloc_huge: - page = shmem_alloc_and_acct_page(gfp, info, sbinfo, - index, true); + page = shmem_alloc_and_acct_page(gfp, inode, index, true); if (IS_ERR(page)) { -alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, info, sbinfo, +alloc_nohuge: page = shmem_alloc_and_acct_page(gfp, inode, index, false); } if (IS_ERR(page)) { @@ -1875,10 +1880,7 @@ clear: * Error recovery. */ unacct: - if (sbinfo->max_blocks) - percpu_counter_sub(&sbinfo->used_blocks, - 1 << compound_order(page)); - shmem_unacct_blocks(info->flags, 1 << compound_order(page)); + shmem_inode_unacct_blocks(inode, 1 << compound_order(page)); if (PageTransHuge(page)) { unlock_page(page); @@ -2214,7 +2216,6 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, { struct inode *inode = file_inode(dst_vma->vm_file); struct shmem_inode_info *info = SHMEM_I(inode); - struct shmem_sb_info *sbinfo = SHMEM_SB(inode->i_sb); struct address_space *mapping = inode->i_mapping; gfp_t gfp = mapping_gfp_mask(mapping); pgoff_t pgoff = linear_page_index(dst_vma, dst_addr); @@ -2226,19 +2227,13 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, int ret; ret = -ENOMEM; - if (shmem_acct_block(info->flags, 1)) + if (!shmem_inode_acct_block(inode, 1)) goto out; - if (sbinfo->max_blocks) { - if (percpu_counter_compare(&sbinfo->used_blocks, - sbinfo->max_blocks) >= 0) - goto out_unacct_blocks; - percpu_counter_inc(&sbinfo->used_blocks); - } if (!*pagep) { page = shmem_alloc_page(gfp, info, pgoff); if (!page) - goto out_dec_used_blocks; + goto out_unacct_blocks; page_kaddr = kmap_atomic(page); ret = copy_from_user(page_kaddr, (const void __user *)src_addr, @@ -2248,9 +2243,7 @@ int shmem_mcopy_atomic_pte(struct mm_struct *dst_mm, /* fallback to copy_from_user outside mmap_sem */ if (unlikely(ret)) { *pagep = page; - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -1); - shmem_unacct_blocks(info->flags, 1); + shmem_inode_unacct_blocks(inode, 1); /* don't free the page */ return -EFAULT; } @@ -2313,11 +2306,8 @@ out_release_uncharge: out_release: unlock_page(page); put_page(page); -out_dec_used_blocks: - if (sbinfo->max_blocks) - percpu_counter_add(&sbinfo->used_blocks, -1); out_unacct_blocks: - shmem_unacct_blocks(info->flags, 1); + shmem_inode_unacct_blocks(inode, 1); goto out; } |