| commit | 12bf2d33fe520f9cfd09f7bf9d46ae3202c3cb49 | |
| author | Greg Kurz <groug@kaod.org> | |
| Fri, 22 Jul 2016 11:10:36 +0000 (22 13:10 +0200) | ||
| committer | David Gibson <david@gibson.dropbear.id.au> | |
| Mon, 25 Jul 2016 05:43:41 +0000 (25 15:43 +1000) | ||
| tree | 11d5a8c78175d70a99ec9ca3a7ce54650179024d | treesnapshot (tar.gz zip) |
| parent | 2fff4bad40abe5781d21c5e134161a1bd13c43cd | commitdiff |
spapr: disintricate core-id from DT semantics
The goal of this patch is to have a stable core-id which does not depend
on any DT related semantics, which involve non-obvious computations on
modern PowerPC server cpus.
With this patch, the DT core id is computed on-demand as:
(core-id / smp_threads) * smt
where smt is the number of threads per core in the host.
This formula should be consolidated in a helper since it is needed in
several places.
Other uses for core-id includes: compute a stable cpu_index (which
allows random order hotplug/unplug without breaking migration) and
NUMA.
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The goal of this patch is to have a stable core-id which does not depend
on any DT related semantics, which involve non-obvious computations on
modern PowerPC server cpus.
With this patch, the DT core id is computed on-demand as:
(core-id / smp_threads) * smt
where smt is the number of threads per core in the host.
This formula should be consolidated in a helper since it is needed in
several places.
Other uses for core-id includes: compute a stable cpu_index (which
allows random order hotplug/unplug without breaking migration) and
NUMA.
Signed-off-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
| hw/ppc/spapr.c | diffblobblamehistory | |
| hw/ppc/spapr_cpu_core.c | diffblobblamehistory |