Re: [LTP] [PATCH] numa_helper: fix compatibility with older libnuma

[Wanlong Gao <gaowanlong@cn.fujitsu.com>]

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 <jstancek@redhat.com>

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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