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| author | Nathan Fontenot <nfont@linux.vnet.ibm.com> | 2018-10-29 19:43:36 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-01-30 13:28:56 +0100 |
| commit | 81b61324922c67f73813d8a9c175f3c153f6a1c6 (patch) | |
| tree | 2cb9bcb1bbe6d9d2724e2bd8f5e5aab0cbb5210a /arch/powerpc/include/asm/topology.h | |
| parent | powerpc: remove unnecessary unlikely() (diff) | |
| download | linux-81b61324922c67f73813d8a9c175f3c153f6a1c6.tar.xz linux-81b61324922c67f73813d8a9c175f3c153f6a1c6.zip | |
powerpc/pseries: Perform full re-add of CPU for topology update post-migration
On pseries systems, performing a partition migration can result in
altering the nodes a CPU is assigned to on the destination system. For
exampl, pre-migration on the source system CPUs are in node 1 and 3,
post-migration on the destination system CPUs are in nodes 2 and 3.
Handling the node change for a CPU can cause corruption in the slab
cache if we hit a timing where a CPUs node is changed while cache_reap()
is invoked. The corruption occurs because the slab cache code appears
to rely on the CPU and slab cache pages being on the same node.
The current dynamic updating of a CPUs node done in arch/powerpc/mm/numa.c
does not prevent us from hitting this scenario.
Changing the device tree property update notification handler that
recognizes an affinity change for a CPU to do a full DLPAR remove and
add of the CPU instead of dynamically changing its node resolves this
issue.
Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Tested-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/topology.h')
| -rw-r--r-- | arch/powerpc/include/asm/topology.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h index a4a718dbfec6..f85e2b01c3df 100644 --- a/arch/powerpc/include/asm/topology.h +++ b/arch/powerpc/include/asm/topology.h @@ -132,6 +132,8 @@ static inline void shared_proc_topology_init(void) {} #define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu)) #define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu)) #define topology_core_id(cpu) (cpu_to_core_id(cpu)) + +int dlpar_cpu_readd(int cpu); #endif #endif |