diff options
Diffstat (limited to 'sys/kern/subr_smp.c')
| -rw-r--r-- | sys/kern/subr_smp.c | 35 |
1 files changed, 33 insertions, 2 deletions
diff --git a/sys/kern/subr_smp.c b/sys/kern/subr_smp.c index 9848136..b09bc50 100644 --- a/sys/kern/subr_smp.c +++ b/sys/kern/subr_smp.c @@ -53,9 +53,7 @@ __FBSDID("$FreeBSD$"); #ifdef SMP MALLOC_DEFINE(M_TOPO, "toponodes", "SMP topology data"); -#endif -#ifdef SMP volatile cpuset_t stopped_cpus; volatile cpuset_t started_cpus; volatile cpuset_t suspended_cpus; @@ -895,6 +893,10 @@ topo_init_root(struct topo_node *root) root->type = TOPO_TYPE_SYSTEM; } +/* + * Add a child node with the given ID under the given parent. + * Do nothing if there is already a child with that ID. + */ struct topo_node * topo_add_node_by_hwid(struct topo_node *parent, int hwid, topo_node_type type, uintptr_t subtype) @@ -921,6 +923,9 @@ topo_add_node_by_hwid(struct topo_node *parent, int hwid, return (node); } +/* + * Find a child node with the given ID under the given parent. + */ struct topo_node * topo_find_node_by_hwid(struct topo_node *parent, int hwid, topo_node_type type, uintptr_t subtype) @@ -938,6 +943,12 @@ topo_find_node_by_hwid(struct topo_node *parent, int hwid, return (NULL); } +/* + * Given a node change the order of its parent's child nodes such + * that the node becomes the firt child while preserving the cyclic + * order of the children. In other words, the given node is promoted + * by rotation. + */ void topo_promote_child(struct topo_node *child) { @@ -959,6 +970,10 @@ topo_promote_child(struct topo_node *child) } } +/* + * Iterate to the next node in the depth-first search (traversal) of + * the topology tree. + */ struct topo_node * topo_next_node(struct topo_node *top, struct topo_node *node) { @@ -977,6 +992,10 @@ topo_next_node(struct topo_node *top, struct topo_node *node) return (NULL); } +/* + * Iterate to the next node in the depth-first search of the topology tree, + * but without descending below the current node. + */ struct topo_node * topo_next_nonchild_node(struct topo_node *top, struct topo_node *node) { @@ -992,6 +1011,10 @@ topo_next_nonchild_node(struct topo_node *top, struct topo_node *node) return (NULL); } +/* + * Assign the given ID to the given topology node that represents a logical + * processor. + */ void topo_set_pu_id(struct topo_node *node, cpuid_t id) { @@ -1013,6 +1036,14 @@ topo_set_pu_id(struct topo_node *node, cpuid_t id) } } +/* + * Check if the topology is uniform, that is, each package has the same number + * of cores in it and each core has the same number of threads (logical + * processors) in it. If so, calculate the number of package, the number of + * cores per package and the number of logical processors per core. + * 'all' parameter tells whether to include administratively disabled logical + * processors into the analysis. + */ int topo_analyze(struct topo_node *topo_root, int all, int *pkg_count, int *cores_per_pkg, int *thrs_per_core) |
