migration: Rename thread debug names

The postcopy thread names on dest QEMU are slightly confusing, partly I'll
need to blame myself on 36f62f11e4 ("migration: Postcopy preemption
preparation on channel creation").  E.g., "fault-fast" reads like a fast
version of "fault-default", but it's actually the fast version of
"postcopy/listen".

Taking this chance, rename all the migration threads with proper rules.
Considering we only have 15 chars usable, prefix all threads with "mig/",
meanwhile identify src/dst threads properly this time.  So now most thread
names will look like "mig/DIR/xxx", where DIR will be "src"/"dst", except
the bg-snapshot thread which doesn't have a direction.

For multifd threads, making them "mig/{src|dst}/{send|recv}_%d".

We used to have "live_migration" thread for a very long time, now it's
called "mig/src/main".  We may hope to have "mig/dst/main" soon but not
yet.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Zhijian Li (Fujitsu) <lizhijian@fujitsu.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Fabiano Rosas <farosas@suse.de>

1 files changed, 3 insertions, 3 deletions

diff --git a/migration/multifd.c b/migration/multifd.c
index d82885fdbb..0b4cbaddfe 100644
--- a/migration/multifd.c
+++ b/migration/multifd.c
@@ -1069,7 +1069,7 @@ static bool multifd_tls_channel_connect(MultiFDSendParams *p,
     args->p = p;
 
     p->tls_thread_created = true;
-    qemu_thread_create(&p->tls_thread, "multifd-tls-handshake-worker",
+    qemu_thread_create(&p->tls_thread, "mig/src/tls",
                        multifd_tls_handshake_thread, args,
                        QEMU_THREAD_JOINABLE);
     return true;
@@ -1190,7 +1190,7 @@ bool multifd_send_setup(void)
             p->packet->magic = cpu_to_be32(MULTIFD_MAGIC);
             p->packet->version = cpu_to_be32(MULTIFD_VERSION);
         }
-        p->name = g_strdup_printf("multifdsend_%d", i);
+        p->name = g_strdup_printf("mig/src/send_%d", i);
         p->page_size = qemu_target_page_size();
         p->page_count = page_count;
         p->write_flags = 0;
@@ -1604,7 +1604,7 @@ int multifd_recv_setup(Error **errp)
                 + sizeof(uint64_t) * page_count;
             p->packet = g_malloc0(p->packet_len);
         }
-        p->name = g_strdup_printf("multifdrecv_%d", i);
+        p->name = g_strdup_printf("mig/dst/recv_%d", i);
         p->normal = g_new0(ram_addr_t, page_count);
         p->zero = g_new0(ram_addr_t, page_count);
         p->page_count = page_count;