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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-07-26 15:26:38 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-26 16:19:19 -0700
commit779750d20b93bb2e0c75dfe924f31b02f6a78bfa (patch)
treed2c97d4a8c3db37796535d5758c06841cb4781cb /include/linux/shmem_fs.h
parente496cf3d782135c1cca0d154d4b924517ff58de0 (diff)
shmem: split huge pages beyond i_size under memory pressure
Even if user asked to allocate huge pages always (huge=always), we should be able to free up some memory by splitting pages which are partly byound i_size if memory presure comes or once we hit limit on filesystem size (-o size=). In order to do this we maintain per-superblock list of inodes, which potentially have huge pages on the border of file size. Per-fs shrinker can reclaim memory by splitting such pages. If we hit -ENOSPC during shmem_getpage_gfp(), we try to split a page to free up space on the filesystem and retry allocation if it succeed. Link: http://lkml.kernel.org/r/1466021202-61880-37-git-send-email-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/shmem_fs.h')
-rw-r--r--include/linux/shmem_fs.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index 54fa28dfbd89..ff078e7043b6 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -16,8 +16,9 @@ struct shmem_inode_info {
unsigned long flags;
unsigned long alloced; /* data pages alloced to file */
unsigned long swapped; /* subtotal assigned to swap */
- struct shared_policy policy; /* NUMA memory alloc policy */
+ struct list_head shrinklist; /* shrinkable hpage inodes */
struct list_head swaplist; /* chain of maybes on swap */
+ struct shared_policy policy; /* NUMA memory alloc policy */
struct simple_xattrs xattrs; /* list of xattrs */
struct inode vfs_inode;
};
@@ -33,6 +34,9 @@ struct shmem_sb_info {
kuid_t uid; /* Mount uid for root directory */
kgid_t gid; /* Mount gid for root directory */
struct mempolicy *mpol; /* default memory policy for mappings */
+ spinlock_t shrinklist_lock; /* Protects shrinklist */
+ struct list_head shrinklist; /* List of shinkable inodes */
+ unsigned long shrinklist_len; /* Length of shrinklist */
};
static inline struct shmem_inode_info *SHMEM_I(struct inode *inode)