ext4: Use tracepoints for mb_history trace file

The /proc/fs/ext4/<dev>/mb_history was maintained manually, and had a
number of problems: it required a largish amount of memory to be
allocated for each ext4 filesystem, and the s_mb_history_lock
introduced a CPU contention problem.  

By ripping out the mb_history code and replacing it with ftrace
tracepoints, and we get more functionality: timestamps, event
filtering, the ability to correlate mballoc history with other ext4
tracepoints, etc.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>

1 files changed, 6 insertions, 8 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index b491576e11c3..c508cf7be75c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -65,6 +65,12 @@ typedef __u32 ext4_lblk_t;
 /* data type for block group number */
 typedef unsigned int ext4_group_t;
 
+/*
+ * Flags used in mballoc's allocation_context flags field.  
+ *
+ * Also used to show what's going on for debugging purposes when the
+ * flag field is exported via the traceport interface
+ */
 
 /* prefer goal again. length */
 #define EXT4_MB_HINT_MERGE              0x0001
@@ -971,14 +977,6 @@ struct ext4_sb_info {
         unsigned long s_mb_last_group;
         unsigned long s_mb_last_start;
 
-        /* history to debug policy */
-        struct ext4_mb_history *s_mb_history;
-        int s_mb_history_cur;
-        int s_mb_history_max;
-        int s_mb_history_num;
-        spinlock_t s_mb_history_lock;
-        int s_mb_history_filter;
-
         /* stats for buddy allocator */
         spinlock_t s_mb_pa_lock;
         atomic_t s_bal_reqs;    /* number of reqs with len > 1 */