add-lazytime-tracepoints

   1 vfs: add lazytime tracepoints for better debugging
   2
   3 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
   4 ---
   5  fs/fs-writeback.c | 1 +
   6  fs/inode.c        | 5 +++++
   7  2 files changed, 6 insertions(+)
   8
   9 diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
  10 index 529480a..3d87174 100644
  11 --- a/fs/fs-writeback.c
  12 +++ b/fs/fs-writeback.c
  13 @@ -27,6 +27,7 @@
  14  #include <linux/backing-dev.h>
  15  #include <linux/tracepoint.h>
  16  #include <linux/device.h>
  17 +#include <trace/events/fs.h>
  18  #include "internal.h"
  19
  20  /*
  21 diff --git a/fs/inode.c b/fs/inode.c
  22 index 37c0429..b2fea60 100644
  23 --- a/fs/inode.c
  24 +++ b/fs/inode.c
  25 @@ -20,6 +20,9 @@
  26  #include <linux/list_lru.h>
  27  #include "internal.h"
  28
  29 +#define CREATE_TRACE_POINTS
  30 +#include <trace/events/fs.h>
  31 +
  32  /*
  33   * Inode locking rules:
  34   *
  35 @@ -1443,6 +1446,7 @@ retry:
  36                                 inode->i_op->write_time(inode);
  37                         else if (inode->i_sb->s_op->write_inode)
  38                                 mark_inode_dirty_sync(inode);
  39 +                       trace_fs_lazytime_iput(inode);
  40                         goto retry;
  41                 }
  42                 iput_final(inode);
  43 @@ -1561,6 +1565,7 @@ static int update_time(struct inode *inode, struct timespec *time, int flags)
  44                 inode->i_ts_dirty_day = days_since_boot;
  45                 spin_unlock(&inode->i_lock);
  46                 inode_requeue_dirtytime(inode);
  47 +               trace_fs_lazytime_defer(inode);
  48                 return 0;
  49         }
  50  force_dirty: