• Steven Whitehouse's avatar
    [GFS2] Fix journal flush problem · b004157a
    Steven Whitehouse authored
    This fixes a bug which resulted in poor performance due to flushing
    the journal too often. The code path in question was via the inode_go_sync()
    function in glops.c. The solution is not to flush the journal immediately
    when inodes are ejected from memory, but batch up the work for glockd to
    deal with later on. This means that glocks may now live on beyond the end of
    the lifetime of their inodes (but not very much longer in the normal case).
    
    Also fixed in this patch is a bug (which was hidden by the bug mentioned above) in
    calculation of the number of free journal blocks.
    
    The gfs2_logd process has been altered to be more responsive to the journal
    filling up. We now wake it up when the number of uncommitted journal blocks
    has reached the threshold level rather than trying to flush directly at the
    end of each transaction. This again means doing fewer, but larger, log
    flushes in general.
    Signed-off-by: default avatarSteven Whitehouse <swhiteho@redhat.com>
    b004157a
daemon.c 4.54 KB