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linux/include/trace/events/jbd2.h
Zhang Yi 4ba3fcdde7 jbd2,ext4: add a shrinker to release checkpointed buffers 
Current metadata buffer release logic in bdev_try_to_free_page() have
a lot of use-after-free issues when umount filesystem concurrently, and
it is difficult to fix directly because ext4 is the only user of
s_op->bdev_try_to_free_page callback and we may have to add more special
refcount or lock that is only used by ext4 into the common vfs layer,
which is unacceptable.

One better solution is remove the bdev_try_to_free_page callback, but
the real problem is we cannot easily release journal_head on the
checkpointed buffer, so try_to_free_buffers() cannot release buffers and
page under memory pressure, which is more likely to trigger
out-of-memory. So we cannot remove the callback directly before we find
another way to release journal_head.

This patch introduce a shrinker to free journal_head on the checkpointed
transaction. After the journal_head got freed, try_to_free_buffers()
could free buffer properly.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20210610112440.3438139-6-yi.zhang@huawei.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2021-06-24 10:54:49 -04:00

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/* SPDX-License-Identifier: GPL-2.0 */
#undef TRACE_SYSTEM
#define TRACE_SYSTEM jbd2
#if !defined(_TRACE_JBD2_H) || defined(TRACE_HEADER_MULTI_READ)
#define _TRACE_JBD2_H
#include <linux/jbd2.h>
#include <linux/tracepoint.h>
struct transaction_chp_stats_s;
struct transaction_run_stats_s;
TRACE_EVENT(jbd2_checkpoint,
TP_PROTO(journal_t *journal, int result),
TP_ARGS(journal, result),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, result )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->result = result;
),
TP_printk("dev %d,%d result %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->result)
);
DECLARE_EVENT_CLASS(jbd2_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
),
TP_printk("dev %d,%d transaction %d sync %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit)
);
DEFINE_EVENT(jbd2_commit, jbd2_start_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd2_commit, jbd2_commit_locking,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd2_commit, jbd2_commit_flushing,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd2_commit, jbd2_commit_logging,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
DEFINE_EVENT(jbd2_commit, jbd2_drop_transaction,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction)
);
TRACE_EVENT(jbd2_end_commit,
TP_PROTO(journal_t *journal, transaction_t *commit_transaction),
TP_ARGS(journal, commit_transaction),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( char, sync_commit )
__field( int, transaction )
__field( int, head )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->sync_commit = commit_transaction->t_synchronous_commit;
__entry->transaction = commit_transaction->t_tid;
__entry->head = journal->j_tail_sequence;
),
TP_printk("dev %d,%d transaction %d sync %d head %d",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->transaction, __entry->sync_commit, __entry->head)
);
TRACE_EVENT(jbd2_submit_inode_data,
TP_PROTO(struct inode *inode),
TP_ARGS(inode),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( ino_t, ino )
),
TP_fast_assign(
__entry->dev = inode->i_sb->s_dev;
__entry->ino = inode->i_ino;
),
TP_printk("dev %d,%d ino %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
(unsigned long) __entry->ino)
);
DECLARE_EVENT_CLASS(jbd2_handle_start_class,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, requested_blocks)
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->requested_blocks = requested_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u "
"requested_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->requested_blocks)
);
DEFINE_EVENT(jbd2_handle_start_class, jbd2_handle_start,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks)
);
DEFINE_EVENT(jbd2_handle_start_class, jbd2_handle_restart,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int requested_blocks),
TP_ARGS(dev, tid, type, line_no, requested_blocks)
);
TRACE_EVENT(jbd2_handle_extend,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int buffer_credits,
int requested_blocks),
TP_ARGS(dev, tid, type, line_no, buffer_credits, requested_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, buffer_credits )
__field( int, requested_blocks)
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->buffer_credits = buffer_credits;
__entry->requested_blocks = requested_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u "
"buffer_credits %d requested_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->buffer_credits,
__entry->requested_blocks)
);
TRACE_EVENT(jbd2_handle_stats,
TP_PROTO(dev_t dev, unsigned long tid, unsigned int type,
unsigned int line_no, int interval, int sync,
int requested_blocks, int dirtied_blocks),
TP_ARGS(dev, tid, type, line_no, interval, sync,
requested_blocks, dirtied_blocks),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned int, type )
__field( unsigned int, line_no )
__field( int, interval )
__field( int, sync )
__field( int, requested_blocks)
__field( int, dirtied_blocks )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->type = type;
__entry->line_no = line_no;
__entry->interval = interval;
__entry->sync = sync;
__entry->requested_blocks = requested_blocks;
__entry->dirtied_blocks = dirtied_blocks;
),
TP_printk("dev %d,%d tid %lu type %u line_no %u interval %d "
"sync %d requested_blocks %d dirtied_blocks %d",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
__entry->type, __entry->line_no, __entry->interval,
__entry->sync, __entry->requested_blocks,
__entry->dirtied_blocks)
);
TRACE_EVENT(jbd2_run_stats,
TP_PROTO(dev_t dev, unsigned long tid,
struct transaction_run_stats_s *stats),
TP_ARGS(dev, tid, stats),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned long, wait )
__field( unsigned long, request_delay )
__field( unsigned long, running )
__field( unsigned long, locked )
__field( unsigned long, flushing )
__field( unsigned long, logging )
__field( __u32, handle_count )
__field( __u32, blocks )
__field( __u32, blocks_logged )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->wait = stats->rs_wait;
__entry->request_delay = stats->rs_request_delay;
__entry->running = stats->rs_running;
__entry->locked = stats->rs_locked;
__entry->flushing = stats->rs_flushing;
__entry->logging = stats->rs_logging;
__entry->handle_count = stats->rs_handle_count;
__entry->blocks = stats->rs_blocks;
__entry->blocks_logged = stats->rs_blocks_logged;
),
TP_printk("dev %d,%d tid %lu wait %u request_delay %u running %u "
"locked %u flushing %u logging %u handle_count %u "
"blocks %u blocks_logged %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
jiffies_to_msecs(__entry->wait),
jiffies_to_msecs(__entry->request_delay),
jiffies_to_msecs(__entry->running),
jiffies_to_msecs(__entry->locked),
jiffies_to_msecs(__entry->flushing),
jiffies_to_msecs(__entry->logging),
__entry->handle_count, __entry->blocks,
__entry->blocks_logged)
);
TRACE_EVENT(jbd2_checkpoint_stats,
TP_PROTO(dev_t dev, unsigned long tid,
struct transaction_chp_stats_s *stats),
TP_ARGS(dev, tid, stats),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( unsigned long, tid )
__field( unsigned long, chp_time )
__field( __u32, forced_to_close )
__field( __u32, written )
__field( __u32, dropped )
),
TP_fast_assign(
__entry->dev = dev;
__entry->tid = tid;
__entry->chp_time = stats->cs_chp_time;
__entry->forced_to_close= stats->cs_forced_to_close;
__entry->written = stats->cs_written;
__entry->dropped = stats->cs_dropped;
),
TP_printk("dev %d,%d tid %lu chp_time %u forced_to_close %u "
"written %u dropped %u",
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->tid,
jiffies_to_msecs(__entry->chp_time),
__entry->forced_to_close, __entry->written, __entry->dropped)
);
TRACE_EVENT(jbd2_update_log_tail,
TP_PROTO(journal_t *journal, tid_t first_tid,
unsigned long block_nr, unsigned long freed),
TP_ARGS(journal, first_tid, block_nr, freed),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( tid_t, tail_sequence )
__field( tid_t, first_tid )
__field(unsigned long, block_nr )
__field(unsigned long, freed )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->tail_sequence = journal->j_tail_sequence;
__entry->first_tid = first_tid;
__entry->block_nr = block_nr;
__entry->freed = freed;
),
TP_printk("dev %d,%d from %u to %u offset %lu freed %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->tail_sequence, __entry->first_tid,
__entry->block_nr, __entry->freed)
);
TRACE_EVENT(jbd2_write_superblock,
TP_PROTO(journal_t *journal, int write_op),
TP_ARGS(journal, write_op),
TP_STRUCT__entry(
__field( dev_t, dev )
__field( int, write_op )
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->write_op = write_op;
),
TP_printk("dev %d,%d write_op %x", MAJOR(__entry->dev),
MINOR(__entry->dev), __entry->write_op)
);
TRACE_EVENT(jbd2_lock_buffer_stall,
TP_PROTO(dev_t dev, unsigned long stall_ms),
TP_ARGS(dev, stall_ms),
TP_STRUCT__entry(
__field( dev_t, dev )
__field(unsigned long, stall_ms )
),
TP_fast_assign(
__entry->dev = dev;
__entry->stall_ms = stall_ms;
),
TP_printk("dev %d,%d stall_ms %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->stall_ms)
);
DECLARE_EVENT_CLASS(jbd2_journal_shrink,
TP_PROTO(journal_t *journal, unsigned long nr_to_scan,
unsigned long count),
TP_ARGS(journal, nr_to_scan, count),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(unsigned long, nr_to_scan)
__field(unsigned long, count)
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->nr_to_scan = nr_to_scan;
__entry->count = count;
),
TP_printk("dev %d,%d nr_to_scan %lu count %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->nr_to_scan, __entry->count)
);
DEFINE_EVENT(jbd2_journal_shrink, jbd2_shrink_count,
TP_PROTO(journal_t *journal, unsigned long nr_to_scan, unsigned long count),
TP_ARGS(journal, nr_to_scan, count)
);
DEFINE_EVENT(jbd2_journal_shrink, jbd2_shrink_scan_enter,
TP_PROTO(journal_t *journal, unsigned long nr_to_scan, unsigned long count),
TP_ARGS(journal, nr_to_scan, count)
);
TRACE_EVENT(jbd2_shrink_scan_exit,
TP_PROTO(journal_t *journal, unsigned long nr_to_scan,
unsigned long nr_shrunk, unsigned long count),
TP_ARGS(journal, nr_to_scan, nr_shrunk, count),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(unsigned long, nr_to_scan)
__field(unsigned long, nr_shrunk)
__field(unsigned long, count)
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->nr_to_scan = nr_to_scan;
__entry->nr_shrunk = nr_shrunk;
__entry->count = count;
),
TP_printk("dev %d,%d nr_to_scan %lu nr_shrunk %lu count %lu",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->nr_to_scan, __entry->nr_shrunk,
__entry->count)
);
TRACE_EVENT(jbd2_shrink_checkpoint_list,
TP_PROTO(journal_t *journal, tid_t first_tid, tid_t tid, tid_t last_tid,
unsigned long nr_freed, unsigned long nr_scanned,
tid_t next_tid),
TP_ARGS(journal, first_tid, tid, last_tid, nr_freed,
nr_scanned, next_tid),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(tid_t, first_tid)
__field(tid_t, tid)
__field(tid_t, last_tid)
__field(unsigned long, nr_freed)
__field(unsigned long, nr_scanned)
__field(tid_t, next_tid)
),
TP_fast_assign(
__entry->dev = journal->j_fs_dev->bd_dev;
__entry->first_tid = first_tid;
__entry->tid = tid;
__entry->last_tid = last_tid;
__entry->nr_freed = nr_freed;
__entry->nr_scanned = nr_scanned;
__entry->next_tid = next_tid;
),
TP_printk("dev %d,%d shrink transaction %u-%u(%u) freed %lu "
"scanned %lu next transaction %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->first_tid, __entry->tid, __entry->last_tid,
__entry->nr_freed, __entry->nr_scanned, __entry->next_tid)
);
#endif /* _TRACE_JBD2_H */
/* This part must be outside protection */
#include <trace/define_trace.h>
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