The new PRRN firmware feature allows CPU and memory resources to be transparently reassigned across NUMA boundaries. When this happens, the kernel must update the node maps to reflect the new affinity information.
Although the NUMA maps can be protected by locking primitives during the update itself, this is insufficient to prevent concurrent accesses to these structures. Since cpumask_of_node() hands out a pointer to these structures, they can still be modified outside of the lock. Furthermore, tracking down each usage of these pointers and adding locks would be quite invasive and difficult to maintain. The approach used is to make a list of affected cpus and call stop_machine to have the update routine run on each of the affected cpus allowing them to update themselves. Each cpu finds itself in the list of cpus and makes the appropriate updates. We need to have each cpu do this for themselves to handle calls to vdso_getcpu_init that is added in a subsequent patch. Situations like these are best handled using stop_machine(). Since the NUMA affinity updates are exceptionally rare events, this approach has the benefit of not adding any overhead while accessing the NUMA maps during normal operation. Signed-off-by: Nathan Fontenot <nf...@linux.vnet.ibm.com> --- arch/powerpc/mm/numa.c | 82 ++++++++++++++++++++++++++++++++++++++----------- 1 file changed, 64 insertions(+), 18 deletions(-) Index: powerpc/arch/powerpc/mm/numa.c =================================================================== --- powerpc.orig/arch/powerpc/mm/numa.c 2013-04-17 14:04:12.000000000 -0500 +++ powerpc/arch/powerpc/mm/numa.c 2013-04-18 09:10:11.000000000 -0500 @@ -22,6 +22,7 @@ #include <linux/pfn.h> #include <linux/cpuset.h> #include <linux/node.h> +#include <linux/stop_machine.h> #include <asm/sparsemem.h> #include <asm/prom.h> #include <asm/smp.h> @@ -1254,6 +1255,13 @@ /* Virtual Processor Home Node (VPHN) support */ #ifdef CONFIG_PPC_SPLPAR +struct topology_update_data { + struct topology_update_data *next; + unsigned int cpu; + int old_nid; + int new_nid; +}; + static u8 vphn_cpu_change_counts[NR_CPUS][MAX_DISTANCE_REF_POINTS]; static cpumask_t cpu_associativity_changes_mask; static int vphn_enabled; @@ -1405,41 +1413,79 @@ } /* + * Update the CPU maps and sysfs entries for a single CPU when its NUMA + * characteristics change. This function doesn't perform any locking and is + * only safe to call from stop_machine(). + */ +static int update_cpu_topology(void *data) +{ + struct topology_update_data *update; + unsigned long cpu; + + if (!data) + return -EINVAL; + + cpu = get_cpu(); + + for (update = data; update; update = update->next) { + if (cpu != update->cpu) + continue; + + unregister_cpu_under_node(update->cpu, update->old_nid); + unmap_cpu_from_node(update->cpu); + map_cpu_to_node(update->cpu, update->new_nid); + register_cpu_under_node(update->cpu, update->new_nid); + } + + return 0; +} + +/* * Update the node maps and sysfs entries for each cpu whose home node * has changed. Returns 1 when the topology has changed, and 0 otherwise. */ int arch_update_cpu_topology(void) { - int cpu, nid, old_nid, changed = 0; + unsigned int cpu, changed = 0; + struct topology_update_data *updates, *ud; unsigned int associativity[VPHN_ASSOC_BUFSIZE] = {0}; struct device *dev; + int weight, i = 0; + + weight = cpumask_weight(&cpu_associativity_changes_mask); + if (!weight) + return 0; + + updates = kzalloc(weight * (sizeof(*updates)), GFP_KERNEL); + if (!updates) + return 0; for_each_cpu(cpu, &cpu_associativity_changes_mask) { + ud = &updates[i++]; + ud->cpu = cpu; vphn_get_associativity(cpu, associativity); - nid = associativity_to_nid(associativity); + ud->new_nid = associativity_to_nid(associativity); - if (nid < 0 || !node_online(nid)) - nid = first_online_node; + if (ud->new_nid < 0 || !node_online(ud->new_nid)) + ud->new_nid = first_online_node; - old_nid = numa_cpu_lookup_table[cpu]; + ud->old_nid = numa_cpu_lookup_table[cpu]; - /* Disable hotplug while we update the cpu - * masks and sysfs. - */ - get_online_cpus(); - unregister_cpu_under_node(cpu, old_nid); - unmap_cpu_from_node(cpu); - map_cpu_to_node(cpu, nid); - register_cpu_under_node(cpu, nid); - put_online_cpus(); + if (i < weight) + ud->next = &updates[i]; + } + + stop_machine(update_cpu_topology, &updates[0], cpu_online_mask); - dev = get_cpu_device(cpu); + for (ud = &updates[0]; ud; ud = ud->next) { + dev = get_cpu_device(ud->cpu); if (dev) kobject_uevent(&dev->kobj, KOBJ_CHANGE); - cpumask_clear_cpu(cpu, &cpu_associativity_changes_mask); + cpumask_clear_cpu(ud->cpu, &cpu_associativity_changes_mask); changed = 1; } + kfree(updates); return changed; } @@ -1488,10 +1534,10 @@ int rc = NOTIFY_DONE; switch (action) { - case OF_RECONFIG_ADD_PROPERTY: case OF_RECONFIG_UPDATE_PROPERTY: update = (struct of_prop_reconfig *)data; - if (!of_prop_cmp(update->dn->type, "cpu")) { + if (!of_prop_cmp(update->dn->type, "cpu") && + !of_prop_cmp(update->prop->name, "ibm,associativity")) { u32 core_id; of_property_read_u32(update->dn, "reg", &core_id); stage_topology_update(core_id); _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev