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jbd2: add tracepoints which provide per-handle statistics

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Handles which stay open a long time are problematic when it comes time
to close down a transaction so it can be committed.  These tracepoints
will help us determine which ones are the problematic ones, and to
validate whether changes makes things better or worse.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2013-02-08 13:00:22 -05:00
parent 078d5039a1
commit 343d9c283c
3 changed files with 131 additions and 3 deletions
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8
include/linux/jbd2.h
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@@ -400,6 +400,11 @@ struct jbd2_journal_handle
unsigned int h_sync: 1; /* sync-on-close */
unsigned int h_jdata: 1; /* force data journaling */
unsigned int h_aborted: 1; /* fatal error on handle */
unsigned int h_type: 8; /* for handle statistics */
unsigned int h_line_no: 16; /* for handle statistics */
unsigned long h_start_jiffies;
unsigned int h_requested_credits;
#ifdef CONFIG_DEBUG_LOCK_ALLOC
struct lockdep_map h_lockdep_map;
@@ -1071,7 +1076,8 @@ static inline handle_t *journal_current_handle(void)
*/
extern handle_t *jbd2_journal_start(journal_t *, int nblocks);
extern handle_t *jbd2__journal_start(journal_t *, int nblocks, gfp_t gfp_mask);
extern handle_t *jbd2__journal_start(journal_t *, int nblocks, gfp_t gfp_mask,
unsigned int type, unsigned int line_no);
extern int jbd2_journal_restart(handle_t *, int nblocks);
extern int jbd2__journal_restart(handle_t *, int nblocks, gfp_t gfp_mask);
extern int jbd2_journal_extend (handle_t *, int nblocks);