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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" <[email protected]>
This commit is contained in:
Theodore Ts'o 2013-02-08 13:00:22 -05:00
commit 343d9c283c
3 changed files with 131 additions and 3 deletions
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28
fs/jbd2/transaction.c
View file

@ -30,6 +30,8 @@
#include <linux/bug.h>
#include <linux/module.h>
#include <trace/events/jbd2.h>
static void __jbd2_journal_temp_unlink_buffer(struct journal_head *jh);
static void __jbd2_journal_unfile_buffer(struct journal_head *jh);
@ -307,6 +309,8 @@ repeat:
*/
update_t_max_wait(transaction, ts);
handle->h_transaction = transaction;
handle->h_requested_credits = nblocks;
handle->h_start_jiffies = jiffies;
atomic_inc(&transaction->t_updates);
atomic_inc(&transaction->t_handle_count);
jbd_debug(4, "Handle %p given %d credits (total %d, free %d)\n",
@ -353,7 +357,8 @@ static handle_t *new_handle(int nblocks)
* Return a pointer to a newly allocated handle, or an ERR_PTR() value
* on failure.
*/
handle_t *jbd2__journal_start(journal_t *journal, int nblocks, gfp_t gfp_mask)
handle_t *jbd2__journal_start(journal_t *journal, int nblocks, gfp_t gfp_mask,
unsigned int type, unsigned int line_no)
{
handle_t *handle = journal_current_handle();
int err;
@ -379,6 +384,11 @@ handle_t *jbd2__journal_start(journal_t *journal, int nblocks, gfp_t gfp_mask)
current->journal_info = NULL;
handle = ERR_PTR(err);
}
handle->h_type = type;
handle->h_line_no = line_no;
trace_jbd2_handle_start(journal->j_fs_dev->bd_dev,
handle->h_transaction->t_tid, type,
line_no, nblocks);
return handle;
}
EXPORT_SYMBOL(jbd2__journal_start);
@ -386,7 +396,7 @@ EXPORT_SYMBOL(jbd2__journal_start);
handle_t *jbd2_journal_start(journal_t *journal, int nblocks)
{
return jbd2__journal_start(journal, nblocks, GFP_NOFS);
return jbd2__journal_start(journal, nblocks, GFP_NOFS, 0, 0);
}
EXPORT_SYMBOL(jbd2_journal_start);
@ -448,7 +458,14 @@ int jbd2_journal_extend(handle_t *handle, int nblocks)
goto unlock;
}
trace_jbd2_handle_extend(journal->j_fs_dev->bd_dev,
handle->h_transaction->t_tid,
handle->h_type, handle->h_line_no,
handle->h_buffer_credits,
nblocks);
handle->h_buffer_credits += nblocks;
handle->h_requested_credits += nblocks;
atomic_add(nblocks, &transaction->t_outstanding_credits);
result = 0;
@ -1377,6 +1394,13 @@ int jbd2_journal_stop(handle_t *handle)
}
jbd_debug(4, "Handle %p going down\n", handle);
trace_jbd2_handle_stats(journal->j_fs_dev->bd_dev,
handle->h_transaction->t_tid,
handle->h_type, handle->h_line_no,
jiffies - handle->h_start_jiffies,
handle->h_sync, handle->h_requested_credits,
(handle->h_requested_credits -
handle->h_buffer_credits));
/*
* Implement synchronous transaction batching. If the handle