mds: add the event when creating the batch head

This could help us the debug the slow request or deadlock bugs and
we could know which stage the request has been in.

Fixes: https://tracker.ceph.com/issues/67280
Signed-off-by: Xiubo Li <xiubli@redhat.com>
(cherry picked from commit 7e08760a0e560759fa73e7b889494bdb60a03ff3)

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 49d5fdd7efaac3ea1b7a5adf812ed1516954ece2..6b57d2b057535cdf92e31f466726a7b113a9ab93 100644 (file)
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -4143,6 +4143,7 @@ void Server::handle_client_getattr(const MDRequestRef& mdr, bool is_lookup)
       auto em = dn->batch_ops.emplace(std::piecewise_construct, std::forward_as_tuple(mask), std::forward_as_tuple());
       if (em.second) {
        em.first->second = std::make_unique<Batch_Getattr_Lookup>(this, mdr);
+        mdr->mark_event("creating lookup batch head");
       } else {
        dout(20) << __func__ << ": LOOKUP op, wait for previous same getattr ops to respond. " << *mdr << dendl;
        em.first->second->add_request(mdr);
@@ -4155,6 +4156,7 @@ void Server::handle_client_getattr(const MDRequestRef& mdr, bool is_lookup)
       auto em = in->batch_ops.emplace(std::piecewise_construct, std::forward_as_tuple(mask), std::forward_as_tuple());
       if (em.second) {
        em.first->second = std::make_unique<Batch_Getattr_Lookup>(this, mdr);
+        mdr->mark_event("creating getattr batch head");
       } else {
        dout(20) << __func__ << ": GETATTR op, wait for previous same getattr ops to respond. " << *mdr << dendl;
        em.first->second->add_request(mdr);