>> >> Maybe you didn't read my last email: >> If 2 different user-mode processes executing on 2 CPUs under 2 different >> users want to access the same shared memory through the >> shmctl(SHM_LOCK) / shmget(SHM_HUGETLB) / usr_shm_lock >> primitives, they could compete/spin even though their user_structs >> are different. >> >> Can you please correct me if I am missing some crucial point of >> understanding ? > > > Mlock is a very very expensive operation. > > Updating the mlock statistics is a very cheap operation. > > Does this spinlock ever show up contention wise? I just tested for working and not contention. :) I was just going by correctness of concept. But I understand what you say and I will try to actually test contention for this in the coming days. > > -- > All rights reversed -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>