• Steven Whitehouse's avatar
    GFS2: Optimise glock lru and end of life inodes · f42ab085
    Steven Whitehouse authored
    The GLF_LRU flag introduced in the previous patch can be
    used to check if a glock is on the lru list when a new
    holder is queued and if so remove it, without having first
    to get the lru_lock.
    
    The main purpose of this patch however is to optimise the
    glocks left over when an inode at end of life is being
    evicted. Previously such glocks were left with the GLF_LFLUSH
    flag set, so that when reclaimed, each one required a log flush.
    This patch resets the GLF_LFLUSH flag when there is nothing
    left to flush thus preventing later log flushes as glocks are
    reused or demoted.
    
    In order to do this, we need to keep track of the number of
    revokes which are outstanding, and also to clear the GLF_LFLUSH
    bit after a log commit when only revokes have been processed.
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    f42ab085
super.c 34.8 KB