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Print journal flusher diagnostics on slow ops

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This commit is contained in:
Vitaliy Filippov
2021-07-17 16:13:41 +03:00
parent 0e0509e3da
commit e74af9745e
9 changed files with 106 additions and 17 deletions
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src/blockstore_flush.cpp
+62 -17
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@@ -182,6 +182,67 @@ void journal_flusher_t::release_trim()
trim_wanted--;
}
void journal_flusher_t::dump_diagnostics()
{
obj_ver_id flushable = { 0 };
// Try to find out if there is a flushable object for information
for (object_id cur_oid: flush_queue)
{
obj_ver_id cur = { .oid = cur_oid, .version = flush_versions[cur_oid] };
auto dirty_end = bs->dirty_db.find(cur);
if (dirty_end == bs->dirty_db.end())
{
// Already flushed
continue;
}
auto repeat_it = sync_to_repeat.find(cur.oid);
if (repeat_it != sync_to_repeat.end())
{
// Someone is already flushing it
continue;
}
if (dirty_end->second.journal_sector >= bs->journal.dirty_start &&
(bs->journal.dirty_start >= bs->journal.used_start ||
dirty_end->second.journal_sector < bs->journal.used_start))
{
// Object is more recent than possible to flush
bool found = try_find_older(dirty_end, cur);
if (!found)
continue;
}
flushable = cur;
break;
}
printf(
"Flusher: queued=%ld first=%lx:%lx trim_wanted=%d dequeuing=%d trimming=%d cur=%d target=%d active=%d syncing=%d\n",
flush_queue.size(), flushable.oid.inode, flushable.oid.stripe,
trim_wanted, dequeuing, trimming, cur_flusher_count, target_flusher_count,
active_flushers, syncing_flushers
);
}
bool journal_flusher_t::try_find_older(std::map<obj_ver_id, dirty_entry>::iterator & dirty_end, obj_ver_id & cur)
{
bool found = false;
while (dirty_end != bs->dirty_db.begin())
{
dirty_end--;
if (dirty_end->first.oid != cur.oid)
{
break;
}
if (!(dirty_end->second.journal_sector >= bs->journal.dirty_start &&
(bs->journal.dirty_start >= bs->journal.used_start ||
dirty_end->second.journal_sector < bs->journal.used_start)))
{
found = true;
cur.version = dirty_end->first.version;
break;
}
}
return found;
}
#define await_sqe(label) \
resume_##label:\
sqe = bs->get_sqe();\
@@ -286,23 +347,7 @@ stop_flusher:
// And it may even block writes if we don't flush the older version
// (if it's in the beginning of the journal)...
// So first try to find an older version of the same object to flush.
bool found = false;
while (dirty_end != bs->dirty_db.begin())
{
dirty_end--;
if (dirty_end->first.oid != cur.oid)
{
break;
}
if (!(dirty_end->second.journal_sector >= bs->journal.dirty_start &&
(bs->journal.dirty_start >= bs->journal.used_start ||
dirty_end->second.journal_sector < bs->journal.used_start)))
{
found = true;
cur.version = dirty_end->first.version;
break;
}
}
bool found = flusher->try_find_older(dirty_end, cur);
if (!found)
{
// Try other objects