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xfs: log recovery tracepoints to track current lsn and buffer submission 

Log recovery has particular rules around buffer submission along with
tricky corner cases where independent transactions can share an LSN. As
such, it can be difficult to follow when/why buffers are submitted
during recovery.

Add a couple tracepoints to post the current LSN of a record when a new
record is being processed and when a buffer is being skipped due to LSN
ordering. Also, update the recover item class to include the LSN of the
current transaction for the item being processed.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Brian Foster 2016-09-26 08:34:52 +10:00 committed by Dave Chinner
parent 60a4a22251
commit 5cd9cee98b
2 changed files with 31 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/xfs/xfs_log_recover.c
View File

@ -2804,6 +2804,7 @@ xlog_recover_buffer_pass2(
*/
lsn = xlog_recover_get_buf_lsn(mp, bp);
if (lsn && lsn != -1 && XFS_LSN_CMP(lsn, current_lsn) >= 0) {
trace_xfs_log_recover_buf_skip(log, buf_f);
xlog_recover_validate_buf_type(mp, bp, buf_f, NULLCOMMITLSN);
goto out_release;
}
@ -4319,6 +4320,7 @@ xlog_recover_process_data(
if (xlog_header_check_recover(log->l_mp, rhead))
return -EIO;
trace_xfs_log_recover_record(log, rhead, pass);
while ((dp < end) && num_logops) {
ohead = (struct xlog_op_header *)dp;

31
fs/xfs/xfs_trace.h
View File

@ -1984,6 +1984,29 @@ DEFINE_EVENT(xfs_swap_extent_class, name, \
DEFINE_SWAPEXT_EVENT(xfs_swap_extent_before);
DEFINE_SWAPEXT_EVENT(xfs_swap_extent_after);
TRACE_EVENT(xfs_log_recover_record,
TP_PROTO(struct xlog *log, struct xlog_rec_header *rhead, int pass),
TP_ARGS(log, rhead, pass),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_lsn_t, lsn)
__field(int, len)
__field(int, num_logops)
__field(int, pass)
),
TP_fast_assign(
__entry->dev = log->l_mp->m_super->s_dev;
__entry->lsn = be64_to_cpu(rhead->h_lsn);
__entry->len = be32_to_cpu(rhead->h_len);
__entry->num_logops = be32_to_cpu(rhead->h_num_logops);
__entry->pass = pass;
),
TP_printk("dev %d:%d lsn 0x%llx len 0x%x num_logops 0x%x pass %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->lsn, __entry->len, __entry->num_logops,
__entry->pass)
)
DECLARE_EVENT_CLASS(xfs_log_recover_item_class,
TP_PROTO(struct xlog *log, struct xlog_recover *trans,
struct xlog_recover_item *item, int pass),
@ -1992,6 +2015,7 @@ DECLARE_EVENT_CLASS(xfs_log_recover_item_class,
__field(dev_t, dev)
__field(unsigned long, item)
__field(xlog_tid_t, tid)
__field(xfs_lsn_t, lsn)
__field(int, type)
__field(int, pass)
__field(int, count)
@ -2001,15 +2025,17 @@ DECLARE_EVENT_CLASS(xfs_log_recover_item_class,
__entry->dev = log->l_mp->m_super->s_dev;
__entry->item = (unsigned long)item;
__entry->tid = trans->r_log_tid;
__entry->lsn = trans->r_lsn;
__entry->type = ITEM_TYPE(item);
__entry->pass = pass;
__entry->count = item->ri_cnt;
__entry->total = item->ri_total;
),
TP_printk("dev %d:%d trans 0x%x, pass %d, item 0x%p, item type %s "
"item region count/total %d/%d",
TP_printk("dev %d:%d tid 0x%x lsn 0x%llx, pass %d, item 0x%p, "
"item type %s item region count/total %d/%d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->tid,
__entry->lsn,
__entry->pass,
(void *)__entry->item,
__print_symbolic(__entry->type, XFS_LI_TYPE_DESC),
@ -2068,6 +2094,7 @@ DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_cancel);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_cancel_add);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_cancel_ref_inc);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_recover);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_skip);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_inode_buf);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_reg_buf);
DEFINE_LOG_RECOVER_BUF_ITEM(xfs_log_recover_buf_dquot_buf);