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tmpfs: convert mem_cgroup shmem to radix-swap

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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>
This commit is contained in:
Hugh Dickins
2011-08-03 16:21:24 -07:00
committed by Linus Torvalds
父節點 54af604218
當前提交 aa3b189551
共有 4 個文件被更改，包括 21 次插入 和 140 次删除
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83
mm/shmem.c
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@@ -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)