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| author | Kirill A. Shutemov <kirill.shutemov@linux.intel.com> | 2016-07-26 15:26:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-26 16:19:19 -0700 |
| commit | 779750d20b93bb2e0c75dfe924f31b02f6a78bfa (patch) | |
| tree | d2c97d4a8c3db37796535d5758c06841cb4781cb /include/linux/shmem_fs.h | |
| parent | e496cf3d782135c1cca0d154d4b924517ff58de0 (diff) | |
| download | lwn-779750d20b93bb2e0c75dfe924f31b02f6a78bfa.tar.gz lwn-779750d20b93bb2e0c75dfe924f31b02f6a78bfa.zip | |
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.h | 6 |
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) |