On 08/21/2015 05:27 AM, Xishi Qiu wrote:
I use numactl(--localalloc) tool run a test case, but it shows that
the numa policy is prefer, I don't know why.
The kernel implements MPOL_PREFERRED and MPOL_LOCAL
in the same way. Look at this code in mpol_new(),
in mm/mempolicy.c:
/*
* MPOL_PREFERRED cannot be used with MPOL_F_STATIC_NODES or
* MPOL_F_RELATIVE_NODES if the nodemask is empty (local
allocation).
* All other modes require a valid pointer to a non-empty nodemask.
*/
if (mode == MPOL_PREFERRED) {
if (nodes_empty(*nodes)) {
if (((flags & MPOL_F_STATIC_NODES) ||
(flags & MPOL_F_RELATIVE_NODES)))
return ERR_PTR(-EINVAL);
}
} else if (mode == MPOL_LOCAL) {
if (!nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
mode = MPOL_PREFERRED;
} else if (nodes_empty(*nodes))
return ERR_PTR(-EINVAL);
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