From 9e0cbcd8887edeefa45c2151fa897146ed6d823d Mon Sep 17 00:00:00 2001 From: Michal Privoznik Date: Wed, 4 Jun 2014 14:39:01 +0200 Subject: [PATCH] virnuma: Check for numa_bitmask_isbitset presence On some systems, libnuma can be present but it's so ancient that it misses some symbols that virNumaGetDistances() needs. To be more precise: numa_bitmask_isbitset() and numa_nodes_ptr are the symbols in question. Fortunately, they were both introduced in the same release so it's sufficient for us to check for only one of them. And the winner is numa_bitmask_isbitset(). Signed-off-by: Michal Privoznik --- m4/virt-numactl.m4 | 4 ++ src/util/virnuma.c | 135 +++++++++++++++++++++++---------------------- 2 files changed, 73 insertions(+), 66 deletions(-) diff --git a/m4/virt-numactl.m4 b/m4/virt-numactl.m4 index 1dcb029a48..fa66d246c1 100644 --- a/m4/virt-numactl.m4 +++ b/m4/virt-numactl.m4 @@ -19,6 +19,10 @@ dnl AC_DEFUN([LIBVIRT_CHECK_NUMACTL],[ LIBVIRT_CHECK_LIB([NUMACTL], [numa], [numa_available], [numa.h]) + AC_CHECK_LIB([numa], [numa_bitmask_isbitset], [have_numa_bitmask_isbitset=yes]) + if test "$have_numa_bitmask_isbitset" = "yes"; then + AC_DEFINE_UNQUOTED([HAVE_NUMA_BITMASK_ISBITSET], 1, [whether numa_bitmask_isbitset is available]) + fi ]) AC_DEFUN([LIBVIRT_RESULT_NUMACTL],[ diff --git a/src/util/virnuma.c b/src/util/virnuma.c index 042844b0f3..1676208b2b 100644 --- a/src/util/virnuma.c +++ b/src/util/virnuma.c @@ -216,61 +216,6 @@ virNumaGetMaxNode(void) } -/** - * virNumaGetDistances: - * @node: identifier of the requested NUMA node - * @distances: array of distances to sibling nodes - * @ndistances: size of @distances - * - * Get array of distances to sibling nodes from @node. If a - * distances[x] equals to zero, the node x is not enabled or - * doesn't exist. As a special case, if @node itself refers to - * disabled or nonexistent NUMA node, then @distances and - * @ndistances are set to NULL and zero respectively. - * - * The distances are a bit of magic. For a local node the value - * is 10, for remote it's typically 20 meaning that time penalty - * for accessing a remote node is two time bigger than when - * accessing a local node. - * - * Returns 0 on success, -1 otherwise. - */ -int -virNumaGetDistances(int node, - int **distances, - int *ndistances) -{ - int ret = -1; - int max_node; - size_t i; - - if (!numa_bitmask_isbitset(numa_nodes_ptr, node)) { - VIR_DEBUG("Node %d does not exist", node); - *distances = NULL; - *ndistances = 0; - return 0; - } - - if ((max_node = virNumaGetMaxNode()) < 0) - goto cleanup; - - if (VIR_ALLOC_N(*distances, max_node) < 0) - goto cleanup; - - *ndistances = max_node + 1; - - for (i = 0; i<= max_node; i++) { - if (!numa_bitmask_isbitset(numa_nodes_ptr, i)) - continue; - - (*distances)[i] = numa_distance(node, i); - } - - ret = 0; - cleanup: - return ret; -} - /** * virNumaGetNodeMemory: * @node: identifier of the requested NUMA node @@ -443,17 +388,6 @@ virNumaGetNodeCPUs(int node ATTRIBUTE_UNUSED, _("NUMA isn't available on this host")); return -1; } - -int -virNumaGetDistances(int node ATTRIBUTE_UNUSED, - int **distances, - int *ndistances) -{ - *distances = NULL; - *ndistances = 0; - VIR_DEBUG("NUMA isn't available on this host"); - return 0; -} #endif @@ -469,3 +403,72 @@ virNumaGetMaxCPUs(void) { return NUMA_MAX_N_CPUS; } + + +#ifdef HAVE_NUMA_BITMASK_ISBITSET +/** + * virNumaGetDistances: + * @node: identifier of the requested NUMA node + * @distances: array of distances to sibling nodes + * @ndistances: size of @distances + * + * Get array of distances to sibling nodes from @node. If a + * distances[x] equals to zero, the node x is not enabled or + * doesn't exist. As a special case, if @node itself refers to + * disabled or nonexistent NUMA node, then @distances and + * @ndistances are set to NULL and zero respectively. + * + * The distances are a bit of magic. For a local node the value + * is 10, for remote it's typically 20 meaning that time penalty + * for accessing a remote node is two time bigger than when + * accessing a local node. + * + * Returns 0 on success, -1 otherwise. + */ +int +virNumaGetDistances(int node, + int **distances, + int *ndistances) +{ + int ret = -1; + int max_node; + size_t i; + + if (!numa_bitmask_isbitset(numa_nodes_ptr, node)) { + VIR_DEBUG("Node %d does not exist", node); + *distances = NULL; + *ndistances = 0; + return 0; + } + + if ((max_node = virNumaGetMaxNode()) < 0) + goto cleanup; + + if (VIR_ALLOC_N(*distances, max_node) < 0) + goto cleanup; + + *ndistances = max_node + 1; + + for (i = 0; i<= max_node; i++) { + if (!numa_bitmask_isbitset(numa_nodes_ptr, i)) + continue; + + (*distances)[i] = numa_distance(node, i); + } + + ret = 0; + cleanup: + return ret; +} +#else +int +virNumaGetDistances(int node ATTRIBUTE_UNUSED, + int **distances, + int *ndistances) +{ + *distances = NULL; + *ndistances = 0; + VIR_DEBUG("NUMA distance information isn't availble on this host"); + return 0; +} +#endif