Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1211327

Re: is this a problem of numactl in RedHat7.0 ?

Show all headers | View raw

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);


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

is this a problem of numactl in RedHat7.0 ? Xishi Qiu <qiuxishi@huawei.com> - 2015-08-21 11:40 +0200
  Re: is this a problem of numactl in RedHat7.0 ? Rik van Riel <riel@redhat.com> - 2015-08-21 23:00 +0200
    Re: is this a problem of numactl in RedHat7.0 ? Xishi Qiu <qiuxishi@huawei.com> - 2015-08-24 05:40 +0200
    Re: is this a problem of numactl in RedHat7.0 ? Xishi Qiu <qiuxishi@huawei.com> - 2015-08-24 06:30 +0200

csiph-web