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bcachefs: Better journal tracepoints
Factor out bch2_journal_bufs_to_text(), and use it in the journal_entry_full() tracepoint; when we can't get a journal reservation we need to know the outstanding journal entry sizes to know if the problem is due to excessive flushing. Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
parent
4ae016607b
commit
e6a2566f7a
@ -27,6 +27,47 @@ static const char * const bch2_journal_errors[] = {
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NULL
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};
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static void bch2_journal_buf_to_text(struct printbuf *out, struct journal *j, u64 seq)
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{
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union journal_res_state s = READ_ONCE(j->reservations);
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unsigned i = seq & JOURNAL_BUF_MASK;
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struct journal_buf *buf = j->buf + i;
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prt_printf(out, "seq:");
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prt_tab(out);
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prt_printf(out, "%llu", seq);
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prt_newline(out);
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printbuf_indent_add(out, 2);
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prt_printf(out, "refcount:");
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prt_tab(out);
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prt_printf(out, "%u", journal_state_count(s, i));
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prt_newline(out);
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prt_printf(out, "size:");
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prt_tab(out);
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prt_human_readable_u64(out, vstruct_bytes(buf->data));
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prt_newline(out);
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prt_printf(out, "expires");
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prt_tab(out);
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prt_printf(out, "%li jiffies", buf->expires - jiffies);
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prt_newline(out);
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printbuf_indent_sub(out, 2);
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}
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static void bch2_journal_bufs_to_text(struct printbuf *out, struct journal *j)
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{
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if (!out->nr_tabstops)
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printbuf_tabstop_push(out, 24);
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for (u64 seq = journal_last_unwritten_seq(j);
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seq <= journal_cur_seq(j);
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seq++)
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bch2_journal_buf_to_text(out, j, seq);
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}
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static inline bool journal_seq_unwritten(struct journal *j, u64 seq)
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{
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return seq > j->seq_ondisk;
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@ -156,7 +197,7 @@ void bch2_journal_buf_put_final(struct journal *j, u64 seq, bool write)
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* We don't close a journal_buf until the next journal_buf is finished writing,
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* and can be opened again - this also initializes the next journal_buf:
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*/
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static void __journal_entry_close(struct journal *j, unsigned closed_val)
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static void __journal_entry_close(struct journal *j, unsigned closed_val, bool trace)
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{
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struct bch_fs *c = container_of(j, struct bch_fs, journal);
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struct journal_buf *buf = journal_cur_buf(j);
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@ -185,7 +226,17 @@ static void __journal_entry_close(struct journal *j, unsigned closed_val)
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/* Close out old buffer: */
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buf->data->u64s = cpu_to_le32(old.cur_entry_offset);
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trace_journal_entry_close(c, vstruct_bytes(buf->data));
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if (trace_journal_entry_close_enabled() && trace) {
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struct printbuf pbuf = PRINTBUF;
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pbuf.atomic++;
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prt_str(&pbuf, "entry size: ");
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prt_human_readable_u64(&pbuf, vstruct_bytes(buf->data));
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prt_newline(&pbuf);
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bch2_prt_task_backtrace(&pbuf, current, 1);
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trace_journal_entry_close(c, pbuf.buf);
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printbuf_exit(&pbuf);
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}
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sectors = vstruct_blocks_plus(buf->data, c->block_bits,
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buf->u64s_reserved) << c->block_bits;
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@ -225,7 +276,7 @@ static void __journal_entry_close(struct journal *j, unsigned closed_val)
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void bch2_journal_halt(struct journal *j)
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{
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spin_lock(&j->lock);
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__journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_ERROR_VAL, true);
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if (!j->err_seq)
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j->err_seq = journal_cur_seq(j);
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journal_wake(j);
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@ -239,7 +290,7 @@ static bool journal_entry_want_write(struct journal *j)
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/* Don't close it yet if we already have a write in flight: */
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if (ret)
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
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else if (nr_unwritten_journal_entries(j)) {
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struct journal_buf *buf = journal_cur_buf(j);
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@ -406,7 +457,7 @@ static void journal_write_work(struct work_struct *work)
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if (delta > 0)
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mod_delayed_work(c->io_complete_wq, &j->write_work, delta);
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else
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
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unlock:
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spin_unlock(&j->lock);
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}
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@ -463,13 +514,21 @@ retry:
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buf->buf_size < JOURNAL_ENTRY_SIZE_MAX)
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j->buf_size_want = max(j->buf_size_want, buf->buf_size << 1);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, false);
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ret = journal_entry_open(j);
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if (ret == JOURNAL_ERR_max_in_flight) {
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track_event_change(&c->times[BCH_TIME_blocked_journal_max_in_flight],
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&j->max_in_flight_start, true);
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trace_and_count(c, journal_entry_full, c);
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if (trace_journal_entry_full_enabled()) {
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struct printbuf buf = PRINTBUF;
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buf.atomic++;
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bch2_journal_bufs_to_text(&buf, j);
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trace_journal_entry_full(c, buf.buf);
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printbuf_exit(&buf);
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}
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count_event(c, journal_entry_full);
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}
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unlock:
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can_discard = j->can_discard;
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@ -549,7 +608,7 @@ void bch2_journal_entry_res_resize(struct journal *j,
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/*
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* Not enough room in current journal entry, have to flush it:
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*/
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
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} else {
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journal_cur_buf(j)->u64s_reserved += d;
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}
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@ -606,7 +665,7 @@ recheck_need_open:
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struct journal_res res = { 0 };
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if (journal_entry_is_open(j))
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
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spin_unlock(&j->lock);
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@ -786,7 +845,7 @@ static struct journal_buf *__bch2_next_write_buffer_flush_journal_buf(struct jou
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if (buf->need_flush_to_write_buffer) {
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if (seq == journal_cur_seq(j))
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL);
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__journal_entry_close(j, JOURNAL_ENTRY_CLOSED_VAL, true);
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union journal_res_state s;
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s.v = atomic64_read_acquire(&j->reservations.counter);
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@ -1339,35 +1398,9 @@ void __bch2_journal_debug_to_text(struct printbuf *out, struct journal *j)
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}
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prt_newline(out);
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for (u64 seq = journal_cur_seq(j);
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seq >= journal_last_unwritten_seq(j);
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--seq) {
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unsigned i = seq & JOURNAL_BUF_MASK;
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prt_printf(out, "unwritten entry:");
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prt_tab(out);
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prt_printf(out, "%llu", seq);
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prt_newline(out);
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printbuf_indent_add(out, 2);
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prt_printf(out, "refcount:");
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prt_tab(out);
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prt_printf(out, "%u", journal_state_count(s, i));
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prt_newline(out);
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prt_printf(out, "sectors:");
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prt_tab(out);
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prt_printf(out, "%u", j->buf[i].sectors);
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prt_newline(out);
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prt_printf(out, "expires");
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prt_tab(out);
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prt_printf(out, "%li jiffies", j->buf[i].expires - jiffies);
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prt_newline(out);
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printbuf_indent_sub(out, 2);
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}
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prt_printf(out, "unwritten entries:");
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prt_newline(out);
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bch2_journal_bufs_to_text(out, j);
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prt_printf(out,
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"replay done:\t\t%i\n",
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@ -46,7 +46,7 @@ DECLARE_EVENT_CLASS(fs_str,
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__assign_str(str, str);
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),
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TP_printk("%d,%d %s", MAJOR(__entry->dev), MINOR(__entry->dev), __get_str(str))
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TP_printk("%d,%d\n%s", MAJOR(__entry->dev), MINOR(__entry->dev), __get_str(str))
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);
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DECLARE_EVENT_CLASS(trans_str,
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@ -273,28 +273,14 @@ DEFINE_EVENT(bch_fs, journal_full,
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TP_ARGS(c)
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);
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DEFINE_EVENT(bch_fs, journal_entry_full,
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TP_PROTO(struct bch_fs *c),
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TP_ARGS(c)
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DEFINE_EVENT(fs_str, journal_entry_full,
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TP_PROTO(struct bch_fs *c, const char *str),
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TP_ARGS(c, str)
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);
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TRACE_EVENT(journal_entry_close,
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TP_PROTO(struct bch_fs *c, unsigned bytes),
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TP_ARGS(c, bytes),
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TP_STRUCT__entry(
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__field(dev_t, dev )
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__field(u32, bytes )
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),
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TP_fast_assign(
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__entry->dev = c->dev;
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__entry->bytes = bytes;
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),
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TP_printk("%d,%d entry bytes %u",
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MAJOR(__entry->dev), MINOR(__entry->dev),
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__entry->bytes)
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DEFINE_EVENT(fs_str, journal_entry_close,
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TP_PROTO(struct bch_fs *c, const char *str),
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TP_ARGS(c, str)
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);
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DEFINE_EVENT(bio, journal_write,
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