umtx: avoid umtxshm locking on object termination if possible
Sample build world result on tmpfs: kern.ipc.umtx_terminate_notempty: 0 kern.ipc.umtx_terminate_empty: 2891815 Sponsored by: The FreeBSD Foundation
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@ -3796,6 +3796,9 @@ umtx_shm_object_terminated(vm_object_t object)
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struct umtx_shm_reg *reg, *reg1;
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bool dofree;
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if (LIST_EMPTY(USHM_OBJ_UMTX(object)))
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return;
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dofree = false;
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mtx_lock(&umtx_shm_lock);
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LIST_FOREACH_SAFE(reg, USHM_OBJ_UMTX(object), ushm_obj_link, reg1) {
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