On 17-01-12 11:26:06, Dave Martin wrote: > Currently the vector length is inherited across both fork() and > exec(). > > Inheritance across fork() is desirable both for creating a copy of > a process (traditional fork) or creating a thread (where we want > all threads to share the same VL by default). > > Inheritance across exec() is less desirable, because of the ABI > impact of large vector lengths on the size of the signal frame -- > when running a new binary, there is no guarantee that the new > binary is compatible with these ABI changes. > > This flag makes the vector length non-inherited by default. Can we make vector length inherited across fork but non-inherited across exec by default? > Instead, the vector length is reset to a system default value, > unless the THREAD_VL_INHERIT flag has been set for the thread. > > THREAD_VL_INHERIT is currently sticky: i.e., if set, it gets > inherited too. This behaviour may be refined in future if it is > not flexible enough. > -- Yao (齐尧) -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
