On 07/13/2012 01:47 PM, Caspar Zhang wrote:
> On 07/12/2012 10:09 PM, Jan Stancek wrote:
>> numa_helper relied on functions that do not exist
>> in old libnuma (<1), which caused that it couldn't be
>> compiled on old distros, for example RHEL 5.3.
>>
>> Old libnuma and kernel also do not support MPOL_F_MEMS_ALLOWED,
>> in which case it will assume that any node with memory > 0 can
>> be used.
>>
>> This patch adds compatibility for older versions, I tested it with:
>> numactl-0.9.8-7.el5
>> numactl-2.0.3-9.el6
>> numactl-2.0.7-6.el7
>>
>> Signed-off-by: Jan Stancek <[email protected]>
Pushed with the style fixed. Thank you.
Wanlong Gao
>> ---
>> testcases/kernel/syscalls/numa/lib/Makefile | 2 +-
>> testcases/kernel/syscalls/numa/lib/numa_helper.c | 52
>> +++++++++++++++++-----
>> 2 files changed, 41 insertions(+), 13 deletions(-)
>>
>> diff --git a/testcases/kernel/syscalls/numa/lib/Makefile
>> b/testcases/kernel/syscalls/numa/lib/Makefile
>> index d4a6f41..ba2fb48 100644
>> --- a/testcases/kernel/syscalls/numa/lib/Makefile
>> +++ b/testcases/kernel/syscalls/numa/lib/Makefile
>> @@ -20,7 +20,7 @@ top_srcdir ?= ../../../../..
>>
>> include $(top_srcdir)/include/mk/env_pre.mk
>>
>> -CPPFLAGS += -I../../../include
>> +CPPFLAGS += -I../../../include $(NUMA_CPPFLAGS)
>> LIB := libnuma_helper.a
>>
>> include $(top_srcdir)/include/mk/lib.mk
>> diff --git a/testcases/kernel/syscalls/numa/lib/numa_helper.c
>> b/testcases/kernel/syscalls/numa/lib/numa_helper.c
>> index 855ee2c..20b06ca 100644
>> --- a/testcases/kernel/syscalls/numa/lib/numa_helper.c
>> +++ b/testcases/kernel/syscalls/numa/lib/numa_helper.c
>> @@ -53,46 +53,74 @@ int get_allowed_nodes_arr(int *num_allowed_nodes, int
>> **allowed_nodes)
>> {
>> #if HAVE_NUMA_H
>> int i;
>> - struct bitmask *allowed_nodemask = NULL;
>> + nodemask_t *allowed_nodemask = NULL;
>> + unsigned long max_node;
>> +
>> +#if !defined(LIBNUMA_API_VERSION) || LIBNUMA_API_VERSION < 2
>> + max_node = NUMA_NUM_NODES;
>> + /*
>> + * NUMA_NUM_NODES is not reliable, libnuma >=2 is looking
>> + * at /proc/self/status to figure out correct number.
>> + * If buffer is not large enough get_mempolicy will fail with EINVAL.
>> + */
>> + if (max_node < 1024)
>> + max_node = 1024;
>> +#else
>> + max_node = numa_max_possible_node() + 1;
>> #endif
>> +#endif /* HAVE_NUMA_H */
>> +
>> *num_allowed_nodes = 0;
>> if (allowed_nodes)
>> *allowed_nodes = NULL;
>>
>> -#if HAVE_NUMA_H && HAVE_MPOL_CONSTANTS
>> - if ((allowed_nodemask = numa_allocate_nodemask()) == NULL)
>> +#if HAVE_NUMA_H
>> + if ((allowed_nodemask = malloc(max_node/8+1)) == NULL)
>
> Better not use assignment in if condition, you need use:
>
> allowed_nodemask = malloc(max_node/8+1);
> if (allowed_nodemask == NULL)
> ....
>
> Else checkpatch.pl will complain.
>
> Rest looks good to me.
>
> Thanks,
> Caspar
>
>> return -1;
>> + nodemask_zero(allowed_nodemask);
>>
>> if (allowed_nodes) {
>> - *allowed_nodes = malloc(sizeof(int)*allowed_nodemask->size);
>> - if (*allowed_nodes == NULL)
>> + *allowed_nodes = malloc(sizeof(int)*max_node);
>> + if (*allowed_nodes == NULL) {
>> + free(allowed_nodemask);
>> return -1;
>> + }
>> }
>>
>> +#if MPOL_F_MEMS_ALLOWED
>> /*
>> * avoid numa_get_mems_allowed(), because of bug in getpol()
>> * utility function in older versions:
>> * http://www.spinics.net/lists/linux-numa/msg00849.html
>> */
>> - if (syscall(__NR_get_mempolicy, NULL, allowed_nodemask->maskp,
>> - allowed_nodemask->size, 0, MPOL_F_MEMS_ALLOWED) < 0) {
>> - numa_bitmask_free(allowed_nodemask);
>> + if (syscall(__NR_get_mempolicy, NULL, allowed_nodemask->n,
>> + max_node, 0, MPOL_F_MEMS_ALLOWED) < 0) {
>> + free(allowed_nodemask);
>> if (allowed_nodes) {
>> free(*allowed_nodes);
>> *allowed_nodes = NULL;
>> }
>> return -2;
>> }
>> +#else
>> + /*
>> + * old libnuma/kernel don't have MPOL_F_MEMS_ALLOWED, so let's assume
>> + * that we can use any node with memory > 0
>> + */
>> + for (i = 0; i < max_node; i++)
>> + if (numa_node_size64(i, NULL) > 0)
>> + nodemask_set(allowed_nodemask, i);
>>
>> - for (i = 0; i < allowed_nodemask->size; i++) {
>> - if (numa_bitmask_isbitset(allowed_nodemask, i)) {
>> +#endif /* MPOL_F_MEMS_ALLOWED */
>> + for (i = 0; i < max_node; i++) {
>> + if (nodemask_isset(allowed_nodemask, i)) {
>> if (allowed_nodes)
>> (*allowed_nodes)[*num_allowed_nodes] = i;
>> (*num_allowed_nodes)++;
>> }
>> }
>> - numa_bitmask_free(allowed_nodemask);
>> -#endif
>> + free(allowed_nodemask);
>> +#endif /* HAVE_NUMA_H */
>> return 0;
>> }
>>
>>
>
>
>
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