Messages in this thread | | | Date | Fri, 21 Aug 2015 16:53:04 -0400 | From | Rik van Riel <> | Subject | Re: is this a problem of numactl in RedHat7.0 ? |
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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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