• Christoph Hellwig's avatar
    xfs: event tracing support · 0b1b213f
    Christoph Hellwig authored
    Convert the old xfs tracing support that could only be used with the
    out of tree kdb and xfsidbg patches to use the generic event tracer.
    
    To use it make sure CONFIG_EVENT_TRACING is enabled and then enable
    all xfs trace channels by:
    
       echo 1 > /sys/kernel/debug/tracing/events/xfs/enable
    
    or alternatively enable single events by just doing the same in one
    event subdirectory, e.g.
    
       echo 1 > /sys/kernel/debug/tracing/events/xfs/xfs_ihold/enable
    
    or set more complex filters, etc. In Documentation/trace/events.txt
    all this is desctribed in more detail.  To reads the events do a
    
       cat /sys/kernel/debug/tracing/trace
    
    Compared to the last posting this patch converts the tracing mostly to
    the one tracepoint per callsite model that other users of the new
    tracing facility also employ.  This allows a very fine-grained control
    of the tracing, a cleaner output of the traces and also enables the
    perf tool to use each tracepoint as a virtual performance counter,
         allowing us to e.g. count how often certain workloads git various
         spots in XFS.  Take a look at
    
        http://lwn.net/Articles/346470/
    
    for some examples.
    
    Also the btree tracing isn't included at all yet, as it will require
    additional core tracing features not in mainline yet, I plan to
    deliver it later.
    
    And the really nice thing about this patch is that it actually removes
    many lines of code while adding this nice functionality:
    
     fs/xfs/Makefile                |    8
     fs/xfs/linux-2.6/xfs_acl.c     |    1
     fs/xfs/linux-2.6/xfs_aops.c    |   52 -
     fs/xfs/linux-2.6/xfs_aops.h    |    2
     fs/xfs/linux-2.6/xfs_buf.c     |  117 +--
     fs/xfs/linux-2.6/xfs_buf.h     |   33
     fs/xfs/linux-2.6/xfs_fs_subr.c |    3
     fs/xfs/linux-2.6/xfs_ioctl.c   |    1
     fs/xfs/linux-2.6/xfs_ioctl32.c |    1
     fs/xfs/linux-2.6/xfs_iops.c    |    1
     fs/xfs/linux-2.6/xfs_linux.h   |    1
     fs/xfs/linux-2.6/xfs_lrw.c     |   87 --
     fs/xfs/linux-2.6/xfs_lrw.h     |   45 -
     fs/xfs/linux-2.6/xfs_super.c   |  104 ---
     fs/xfs/linux-2.6/xfs_super.h   |    7
     fs/xfs/linux-2.6/xfs_sync.c    |    1
     fs/xfs/linux-2.6/xfs_trace.c   |   75 ++
     fs/xfs/linux-2.6/xfs_trace.h   | 1369 +++++++++++++++++++++++++++++++++++++++++
     fs/xfs/linux-2.6/xfs_vnode.h   |    4
     fs/xfs/quota/xfs_dquot.c       |  110 ---
     fs/xfs/quota/xfs_dquot.h       |   21
     fs/xfs/quota/xfs_qm.c          |   40 -
     fs/xfs/quota/xfs_qm_syscalls.c |    4
     fs/xfs/support/ktrace.c        |  323 ---------
     fs/xfs/support/ktrace.h        |   85 --
     fs/xfs/xfs.h                   |   16
     fs/xfs/xfs_ag.h                |   14
     fs/xfs/xfs_alloc.c             |  230 +-----
     fs/xfs/xfs_alloc.h             |   27
     fs/xfs/xfs_alloc_btree.c       |    1
     fs/xfs/xfs_attr.c              |  107 ---
     fs/xfs/xfs_attr.h              |   10
     fs/xfs/xfs_attr_leaf.c         |   14
     fs/xfs/xfs_attr_sf.h           |   40 -
     fs/xfs/xfs_bmap.c              |  507 +++------------
     fs/xfs/xfs_bmap.h              |   49 -
     fs/xfs/xfs_bmap_btree.c        |    6
     fs/xfs/xfs_btree.c             |    5
     fs/xfs/xfs_btree_trace.h       |   17
     fs/xfs/xfs_buf_item.c          |   87 --
     fs/xfs/xfs_buf_item.h          |   20
     fs/xfs/xfs_da_btree.c          |    3
     fs/xfs/xfs_da_btree.h          |    7
     fs/xfs/xfs_dfrag.c             |    2
     fs/xfs/xfs_dir2.c              |    8
     fs/xfs/xfs_dir2_block.c        |   20
     fs/xfs/xfs_dir2_leaf.c         |   21
     fs/xfs/xfs_dir2_node.c         |   27
     fs/xfs/xfs_dir2_sf.c           |   26
     fs/xfs/xfs_dir2_trace.c        |  216 ------
     fs/xfs/xfs_dir2_trace.h        |   72 --
     fs/xfs/xfs_filestream.c        |    8
     fs/xfs/xfs_fsops.c             |    2
     fs/xfs/xfs_iget.c              |  111 ---
     fs/xfs/xfs_inode.c             |   67 --
     fs/xfs/xfs_inode.h             |   76 --
     fs/xfs/xfs_inode_item.c        |    5
     fs/xfs/xfs_iomap.c             |   85 --
     fs/xfs/xfs_iomap.h             |    8
     fs/xfs/xfs_log.c               |  181 +----
     fs/xfs/xfs_log_priv.h          |   20
     fs/xfs/xfs_log_recover.c       |    1
     fs/xfs/xfs_mount.c             |    2
     fs/xfs/xfs_quota.h             |    8
     fs/xfs/xfs_rename.c            |    1
     fs/xfs/xfs_rtalloc.c           |    1
     fs/xfs/xfs_rw.c                |    3
     fs/xfs/xfs_trans.h             |   47 +
     fs/xfs/xfs_trans_buf.c         |   62 -
     fs/xfs/xfs_vnodeops.c          |    8
     70 files changed, 2151 insertions(+), 2592 deletions(-)
    Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
    Signed-off-by: default avatarAlex Elder <aelder@sgi.com>
    0b1b213f
xfs_qm_syscalls.c 33.7 KB