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authorJeffle Xu <jefflexu@linux.alibaba.com>2021-11-25 15:05:27 +0800
committerMiklos Szeredi <mszeredi@redhat.com>2021-12-14 11:09:37 +0100
commit93a497b9ad695bb2f38a302c5b29dbc9b555ff3f (patch)
tree3a778130fc515d71d49d049a7c677ca0f7312abb /fs/fuse/inode.c
parent98046f7486db723ec8bb99a950a4fa5f5be55cd1 (diff)
fuse: enable per inode DAX
DAX may be limited in some specific situation. When the number of usable DAX windows is under watermark, the recalim routine will be triggered to reclaim some DAX windows. It may have a negative impact on the performance, since some processes may need to wait for DAX windows to be recalimed and reused then. To mitigate the performance degradation, the overall DAX window need to be expanded larger. However, simply expanding the DAX window may not be a good deal in some scenario. To maintain one DAX window chunk (i.e., 2MB in size), 32KB (512 * 64 bytes) memory footprint will be consumed for page descriptors inside guest, which is greater than the memory footprint if it uses guest page cache when DAX disabled. Thus it'd better disable DAX for those files smaller than 32KB, to reduce the demand for DAX window and thus avoid the unworthy memory overhead. Per inode DAX feature is introduced to address this issue, by offering a finer grained control for dax to users, trying to achieve a balance between performance and memory overhead. The FUSE_ATTR_DAX flag in FUSE_LOOKUP reply is used to indicate whether DAX should be enabled or not for corresponding file. Currently the state whether DAX is enabled or not for the file is initialized only when inode is instantiated. Signed-off-by: Jeffle Xu <jefflexu@linux.alibaba.com> Reviewed-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/inode.c')
-rw-r--r--fs/fuse/inode.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index d83589ef11c0..dc6714350f21 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -313,7 +313,7 @@ static void fuse_init_inode(struct inode *inode, struct fuse_attr *attr)
inode->i_ctime.tv_nsec = attr->ctimensec;
if (S_ISREG(inode->i_mode)) {
fuse_init_common(inode);
- fuse_init_file_inode(inode);
+ fuse_init_file_inode(inode, attr->flags);
} else if (S_ISDIR(inode->i_mode))
fuse_init_dir(inode);
else if (S_ISLNK(inode->i_mode))