Struct InodeOperations

pub struct InodeOperations {
    pub cache_lookups: u32,
    pub cache_hits: u32,
    pub cache_recycle: u32,
    pub cache_missed: u32,
    pub cache_dup: u32,
    pub cache_reclaime: u32,
    pub inode_attr_changes: u32,
}

Fields

cache_lookups: u32

This is the number of times the operating system looked for an XFS inode in the inode cache. Whether the inode was found in the cache or needed to be read in from the disk is not indicated here, but this can be computed from the ig_found and ig_missed counts.

cache_hits: u32

This is the number of times the operating system looked for an XFS inode in the inode cache and found it. The closer this count is to the ig_attempts count the better the inode cache is performing.

cache_recycle: u32

This is the number of times the operating system looked for an XFS inode in the inode cache and saw that it was there but was unable to use the in memory inode because it was being recycled by another process.

cache_missed: u32

This is the number of times the operating system looked for an XFS inode in the inode cache and the inode was not there. The further this count is from the ig_attempts count the better.

cache_dup: u32

This is the number of times the operating system looked for an XFS inode in the inode cache and found that it was not there but upon attempting to add the inode to the cache found that another process had already inserted it.

cache_reclaime: u32

This is the number of times the operating system recycled an XFS inode from the inode cache in order to use the memory for that inode for another purpose. Inodes are recycled in order to keep the inode cache from growing without bound. If the reclaim rate is high it may be beneficial to raise the vnode_free_ratio kernel tunable variable to increase the size of the inode cache.

inode_attr_changes: u32

This is the number of times the operating system explicitly changed the attributes of an XFS inode. For example, this could be to change the inode’s owner, the inode’s size, or the inode’s timestamps.