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>

diff --git a/src/mds/Server.cc b/src/mds/Server.cc
index 011718aa8c96baf897311c563fc831859da5339a..275a62c587aefe2ea2b171baadfe2bb8f957af6b 100644 (file)
--- a/src/mds/Server.cc
+++ b/src/mds/Server.cc
@@ -4135,6 +4135,7 @@ 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);
@@ -4147,6 +4148,7 @@ 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);