diff options
author | Hugh Dickins <hughd@google.com> | 2011-08-03 23:21:24 (GMT) |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-08-04 00:25:24 (GMT) |
commit | aa3b189551ad8e5cc1d9c663735c131650238278 (patch) | |
tree | c789ab5c7f890a6065811d8bba15a784caf9e859 /mm/shmem.c | |
parent | 54af60421822bb9cb664dd5cd7aac46c01ccfcf8 (diff) | |
download | linux-aa3b189551ad8e5cc1d9c663735c131650238278.tar.xz |
tmpfs: convert mem_cgroup shmem to radix-swap
Remove mem_cgroup_shmem_charge_fallback(): it was only required when we
had to move swappage to filecache with GFP_NOWAIT.
Remove the GFP_NOWAIT special case from mem_cgroup_cache_charge(), by
moving its call out from shmem_add_to_page_cache() to two of thats three
callers. But leave it doing mem_cgroup_uncharge_cache_page() on error:
although asymmetrical, it's easier for all 3 callers to handle.
These two changes would also be appropriate if anyone were to start
using shmem_read_mapping_page_gfp() with GFP_NOWAIT.
Remove mem_cgroup_get_shmem_target(): mc_handle_file_pte() can test
radix_tree_exceptional_entry() to get what it needs for itself.
Signed-off-by: Hugh Dickins <hughd@google.com>
Acked-by: Rik van Riel <riel@redhat.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 | 83 |
1 files changed, 11 insertions, 72 deletions
@@ -262,15 +262,11 @@ static int shmem_add_to_page_cache(struct page *page, struct address_space *mapping, pgoff_t index, gfp_t gfp, void *expected) { - int error; + int error = 0; VM_BUG_ON(!PageLocked(page)); VM_BUG_ON(!PageSwapBacked(page)); - error = mem_cgroup_cache_charge(page, current->mm, - gfp & GFP_RECLAIM_MASK); - if (error) - goto out; if (!expected) error = radix_tree_preload(gfp & GFP_RECLAIM_MASK); if (!error) { @@ -300,7 +296,6 @@ static int shmem_add_to_page_cache(struct page *page, } if (error) mem_cgroup_uncharge_cache_page(page); -out: return error; } @@ -660,7 +655,6 @@ int shmem_unuse(swp_entry_t swap, struct page *page) * Charge page using GFP_KERNEL while we can wait, before taking * the shmem_swaplist_mutex which might hold up shmem_writepage(). * Charged back to the user (not to caller) when swap account is used. - * shmem_add_to_page_cache() will be called with GFP_NOWAIT. */ error = mem_cgroup_cache_charge(page, current->mm, GFP_KERNEL); if (error) @@ -954,8 +948,11 @@ repeat: goto failed; } - error = shmem_add_to_page_cache(page, mapping, index, - gfp, swp_to_radix_entry(swap)); + error = mem_cgroup_cache_charge(page, current->mm, + gfp & GFP_RECLAIM_MASK); + if (!error) + error = shmem_add_to_page_cache(page, mapping, index, + gfp, swp_to_radix_entry(swap)); if (error) goto failed; @@ -990,8 +987,11 @@ repeat: SetPageSwapBacked(page); __set_page_locked(page); - error = shmem_add_to_page_cache(page, mapping, index, - gfp, NULL); + error = mem_cgroup_cache_charge(page, current->mm, + gfp & GFP_RECLAIM_MASK); + if (!error) + error = shmem_add_to_page_cache(page, mapping, index, + gfp, NULL); if (error) goto decused; lru_cache_add_anon(page); @@ -2442,42 +2442,6 @@ out4: return error; } -#ifdef CONFIG_CGROUP_MEM_RES_CTLR -/** - * mem_cgroup_get_shmem_target - find page or swap assigned to the shmem file - * @inode: the inode to be searched - * @index: the page offset to be searched - * @pagep: the pointer for the found page to be stored - * @swapp: the pointer for the found swap entry to be stored - * - * If a page is found, refcount of it is incremented. Callers should handle - * these refcount. - */ -void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t index, - struct page **pagep, swp_entry_t *swapp) -{ - struct shmem_inode_info *info = SHMEM_I(inode); - struct page *page = NULL; - swp_entry_t swap = {0}; - - if ((index << PAGE_CACHE_SHIFT) >= i_size_read(inode)) - goto out; - - spin_lock(&info->lock); -#ifdef CONFIG_SWAP - swap = shmem_get_swap(info, index); - if (swap.val) - page = find_get_page(&swapper_space, swap.val); - else -#endif - page = find_get_page(inode->i_mapping, index); - spin_unlock(&info->lock); -out: - *pagep = page; - *swapp = swap; -} -#endif - #else /* !CONFIG_SHMEM */ /* @@ -2523,31 +2487,6 @@ void shmem_truncate_range(struct inode *inode, loff_t lstart, loff_t lend) } EXPORT_SYMBOL_GPL(shmem_truncate_range); -#ifdef CONFIG_CGROUP_MEM_RES_CTLR -/** - * mem_cgroup_get_shmem_target - find page or swap assigned to the shmem file - * @inode: the inode to be searched - * @index: the page offset to be searched - * @pagep: the pointer for the found page to be stored - * @swapp: the pointer for the found swap entry to be stored - * - * If a page is found, refcount of it is incremented. Callers should handle - * these refcount. - */ -void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t index, - struct page **pagep, swp_entry_t *swapp) -{ - struct page *page = NULL; - - if ((index << PAGE_CACHE_SHIFT) >= i_size_read(inode)) - goto out; - page = find_get_page(inode->i_mapping, index); -out: - *pagep = page; - *swapp = (swp_entry_t){0}; -} -#endif - #define shmem_vm_ops generic_file_vm_ops #define shmem_file_operations ramfs_file_operations #define shmem_get_inode(sb, dir, mode, dev, flags) ramfs_get_inode(sb, dir, mode, dev) |