Hi! I've started to write tests for mbind() and found out that mbind() does not work as described in manual page in a case that page has been faulted on different node that we are asking it to bind to. Looks like this is working fine on older kernels. On my testing machine with 3.0 mbind() fails correctly with EIO but succeeds unexpectedly on newer kernels such as 4.12. What the test does is: * mmap() private mapping * fault it * find out on which node it is faulted on * mbind() it to a different node with MPOL_BIND and MPOL_MF_STRICT and expects to get EIO The test code can be seen and compiled from: https://github.com/metan-ucw/ltp/blob/master/testcases/kernel/syscalls/mbind/mbind02.c -- Cyril Hrubis chrubis@xxxxxxx
