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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2016-07-27 01:26:18 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2016-07-27 02:19:19 +0300
commit800d8c63b2e989c2e349632d1648119bf5862f01 (patch)
tree8f72ce10bcdc01f17a5e8f2197ae4858fbab6bd4 /include/linux/shmem_fs.h
parentc01d5b300774d130a24d787825b01eb24e6e20cb (diff)
downloadlinux-800d8c63b2e989c2e349632d1648119bf5862f01.tar.xz
shmem: add huge pages support
Here's basic implementation of huge pages support for shmem/tmpfs. It's all pretty streight-forward: - shmem_getpage() allcoates huge page if it can and try to inserd into radix tree with shmem_add_to_page_cache(); - shmem_add_to_page_cache() puts the page onto radix-tree if there's space for it; - shmem_undo_range() removes huge pages, if it fully within range. Partial truncate of huge pages zero out this part of THP. This have visible effect on fallocate(FALLOC_FL_PUNCH_HOLE) behaviour. As we don't really create hole in this case, lseek(SEEK_HOLE) may have inconsistent results depending what pages happened to be allocated. - no need to change shmem_fault: core-mm will map an compound page as huge if VMA is suitable; Link: http://lkml.kernel.org/r/1466021202-61880-30-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.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/shmem_fs.h b/include/linux/shmem_fs.h
index ff2de4bab61f..94eaaa2c6ad9 100644
--- a/include/linux/shmem_fs.h
+++ b/include/linux/shmem_fs.h
@@ -71,6 +71,9 @@ static inline struct page *shmem_read_mapping_page(
mapping_gfp_mask(mapping));
}
+extern bool shmem_charge(struct inode *inode, long pages);
+extern void shmem_uncharge(struct inode *inode, long pages);
+
#ifdef CONFIG_TMPFS
extern int shmem_add_seals(struct file *file, unsigned int seals);