xfs: event tracing support

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: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 13 insertions, 7 deletions

diff --git a/fs/xfs/xfs_dir2_block.c b/fs/xfs/xfs_dir2_block.c
index ab52e9e1c1ee..ddc4ecc7807f 100644
--- a/fs/xfs/xfs_dir2_block.c
+++ b/fs/xfs/xfs_dir2_block.c
@@ -36,8 +36,8 @@
 #include "xfs_dir2_data.h"
 #include "xfs_dir2_leaf.h"
 #include "xfs_dir2_block.h"
-#include "xfs_dir2_trace.h"
 #include "xfs_error.h"
+#include "xfs_trace.h"
 
 /*
  * Local function prototypes.
@@ -94,7 +94,8 @@ xfs_dir2_block_addname(
         __be16                  *tagp;          /* pointer to tag value */
         xfs_trans_t             *tp;            /* transaction structure */
 
-        xfs_dir2_trace_args("block_addname", args);
+        trace_xfs_dir2_block_addname(args);
+
         dp = args->dp;
         tp = args->trans;
         mp = dp->i_mount;
@@ -590,7 +591,8 @@ xfs_dir2_block_lookup(
         int                     error;          /* error return value */
         xfs_mount_t             *mp;            /* filesystem mount point */
 
-        xfs_dir2_trace_args("block_lookup", args);
+        trace_xfs_dir2_block_lookup(args);
+
         /*
          * Get the buffer, look up the entry.
          * If not found (ENOENT) then return, have no buffer.
@@ -747,7 +749,8 @@ xfs_dir2_block_removename(
         int                     size;           /* shortform size */
         xfs_trans_t             *tp;            /* transaction pointer */
 
-        xfs_dir2_trace_args("block_removename", args);
+        trace_xfs_dir2_block_removename(args);
+
         /*
          * Look up the entry in the block.  Gets the buffer and entry index.
          * It will always be there, the vnodeops level does a lookup first.
@@ -823,7 +826,8 @@ xfs_dir2_block_replace(
         int                     error;          /* error return value */
         xfs_mount_t             *mp;            /* filesystem mount point */
 
-        xfs_dir2_trace_args("block_replace", args);
+        trace_xfs_dir2_block_replace(args);
+
         /*
          * Lookup the entry in the directory.  Get buffer and entry index.
          * This will always succeed since the caller has already done a lookup.
@@ -897,7 +901,8 @@ xfs_dir2_leaf_to_block(
         int                     to;             /* block/leaf to index */
         xfs_trans_t             *tp;            /* transaction pointer */
 
-        xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
+        trace_xfs_dir2_leaf_to_block(args);
+
         dp = args->dp;
         tp = args->trans;
         mp = dp->i_mount;
@@ -1044,7 +1049,8 @@ xfs_dir2_sf_to_block(
         xfs_trans_t             *tp;            /* transaction pointer */
         struct xfs_name         name;
 
-        xfs_dir2_trace_args("sf_to_block", args);
+        trace_xfs_dir2_sf_to_block(args);
+
         dp = args->dp;
         tp = args->trans;
         mp = dp->i_mount;