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 | 5 ++++-
   6  fs/inode.c        | 5 +++++
   7  2 files changed, 9 insertions(+), 1 deletion(-)
   8
   9 diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
  10 index eb04277..cab2d6d 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 @@ -1304,8 +1305,10 @@ static void flush_sb_dirty_time(struct super_block *sb)
  22                 iput(old_inode);
  23                 old_inode = inode;
  24
  25 -               if (dirty_time)
  26 +               if (dirty_time) {
  27 +                       trace_fs_lazytime_flush(inode);
  28                         mark_inode_dirty(inode);
  29 +               }
  30                 cond_resched();
  31                 spin_lock(&inode_sb_list_lock);
  32         }
  33 diff --git a/fs/inode.c b/fs/inode.c
  34 index 321c7d7..bd6e0e6 100644
  35 --- a/fs/inode.c
  36 +++ b/fs/inode.c
  37 @@ -20,6 +20,9 @@
  38  #include <linux/list_lru.h>
  39  #include "internal.h"
  40
  41 +#define CREATE_TRACE_POINTS
  42 +#include <trace/events/fs.h>
  43 +
  44  /*
  45   * Inode locking rules:
  46   *
  47 @@ -544,6 +547,7 @@ static void evict(struct inode *inode)
  48                         mark_inode_dirty(inode);
  49                         inode->i_sb->s_op->write_inode(inode, &wbc);
  50                 }
  51 +               trace_fs_lazytime_evict(inode);
  52         }
  53
  54         if (!list_empty(&inode->i_wb_list))
  55 @@ -1550,6 +1554,7 @@ static int update_time(struct inode *inode, struct timespec *time, int flags)
  56                         inode->i_state |= I_DIRTY_TIME;
  57                         spin_unlock(&inode->i_lock);
  58                         inode->i_ts_dirty_day = days_since_boot;
  59 +                       trace_fs_lazytime_defer(inode);
  60                         return 0;
  61                 }
  62         }