tmpfs: convert mem_cgroup shmem to radix-swap
Hugh Dickins [Wed, 3 Aug 2011 23:21:24 +0000 (16:21 -0700)]
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>

include/linux/memcontrol.h
include/linux/shmem_fs.h
mm/memcontrol.c
mm/shmem.c

index b966007..3b535db 100644 (file)
@@ -86,8 +86,6 @@ extern void mem_cgroup_uncharge_end(void);
 
 extern void mem_cgroup_uncharge_page(struct page *page);
 extern void mem_cgroup_uncharge_cache_page(struct page *page);
-extern int mem_cgroup_shmem_charge_fallback(struct page *page,
-                       struct mm_struct *mm, gfp_t gfp_mask);
 
 extern void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask);
 int task_in_mem_cgroup(struct task_struct *task, const struct mem_cgroup *mem);
@@ -225,12 +223,6 @@ static inline void mem_cgroup_uncharge_cache_page(struct page *page)
 {
 }
 
-static inline int mem_cgroup_shmem_charge_fallback(struct page *page,
-                       struct mm_struct *mm, gfp_t gfp_mask)
-{
-       return 0;
-}
-
 static inline void mem_cgroup_add_lru_list(struct page *page, int lru)
 {
 }
index 3f05795..0c8e952 100644 (file)
@@ -57,8 +57,6 @@ extern struct page *shmem_read_mapping_page_gfp(struct address_space *mapping,
                                        pgoff_t index, gfp_t gfp_mask);
 extern void shmem_truncate_range(struct inode *inode, loff_t start, loff_t end);
 extern int shmem_unuse(swp_entry_t entry, struct page *page);
-extern void mem_cgroup_get_shmem_target(struct inode *inode, pgoff_t pgoff,
-                                       struct page **pagep, swp_entry_t *ent);
 
 static inline struct page *shmem_read_mapping_page(
                                struct address_space *mapping, pgoff_t index)
index 5f84d23..f4ec4e7 100644 (file)
@@ -35,7 +35,6 @@
 #include <linux/limits.h>
 #include <linux/mutex.h>
 #include <linux/rbtree.h>
-#include <linux/shmem_fs.h>
 #include <linux/slab.h>
 #include <linux/swap.h>
 #include <linux/swapops.h>
@@ -2873,30 +2872,6 @@ int mem_cgroup_cache_charge(struct page *page, struct mm_struct *mm,
                return 0;
        if (PageCompound(page))
                return 0;
-       /*
-        * Corner case handling. This is called from add_to_page_cache()
-        * in usual. But some FS (shmem) precharges this page before calling it
-        * and call add_to_page_cache() with GFP_NOWAIT.
-        *
-        * For GFP_NOWAIT case, the page may be pre-charged before calling
-        * add_to_page_cache(). (See shmem.c) check it here and avoid to call
-        * charge twice. (It works but has to pay a bit larger cost.)
-        * And when the page is SwapCache, it should take swap information
-        * into account. This is under lock_page() now.
-        */
-       if (!(gfp_mask & __GFP_WAIT)) {
-               struct page_cgroup *pc;
-
-               pc = lookup_page_cgroup(page);
-               if (!pc)
-                       return 0;
-               lock_page_cgroup(pc);
-               if (PageCgroupUsed(pc)) {
-                       unlock_page_cgroup(pc);
-                       return 0;
-               }
-               unlock_page_cgroup(pc);
-       }
 
        if (unlikely(!mm))
                mm = &init_mm;
@@ -3486,31 +3461,6 @@ void mem_cgroup_end_migration(struct mem_cgroup *mem,
        cgroup_release_and_wakeup_rmdir(&mem->css);
 }
 
-/*
- * A call to try to shrink memory usage on charge failure at shmem's swapin.
- * Calling hierarchical_reclaim is not enough because we should update
- * last_oom_jiffies to prevent pagefault_out_of_memory from invoking global OOM.
- * Moreover considering hierarchy, we should reclaim from the mem_over_limit,
- * not from the memcg which this page would be charged to.
- * try_charge_swapin does all of these works properly.
- */
-int mem_cgroup_shmem_charge_fallback(struct page *page,
-                           struct mm_struct *mm,
-                           gfp_t gfp_mask)
-{
-       struct mem_cgroup *mem;
-       int ret;
-
-       if (mem_cgroup_disabled())
-               return 0;
-
-       ret = mem_cgroup_try_charge_swapin(mm, page, gfp_mask, &mem);
-       if (!ret)
-               mem_cgroup_cancel_charge_swapin(mem); /* it does !mem check */
-
-       return ret;
-}
-
 #ifdef CONFIG_DEBUG_VM
 static struct page_cgroup *lookup_page_cgroup_used(struct page *page)
 {
@@ -5330,15 +5280,17 @@ static struct page *mc_handle_file_pte(struct vm_area_struct *vma,
                pgoff = pte_to_pgoff(ptent);
 
        /* page is moved even if it's not RSS of this task(page-faulted). */
-       if (!mapping_cap_swap_backed(mapping)) { /* normal file */
-               page = find_get_page(mapping, pgoff);
-       } else { /* shmem/tmpfs file. we should take account of swap too. */
-               swp_entry_t ent;
-               mem_cgroup_get_shmem_target(inode, pgoff, &page, &ent);
+       page = find_get_page(mapping, pgoff);
+
+#ifdef CONFIG_SWAP
+       /* shmem/tmpfs may report page out on swap: account for that too. */
+       if (radix_tree_exceptional_entry(page)) {
+               swp_entry_t swap = radix_to_swp_entry(page);
                if (do_swap_account)
-                       entry->val = ent.val;
+                       *entry = swap;
+               page = find_get_page(&swapper_space, swap.val);
        }
-
+#endif
        return page;
 }
 
index 92f01d7..13ef2d7 100644 (file)
@@ -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)