----- Original Message -----
> From: "Stanislav Kholmanskikh" <stanislav.kholmansk...@oracle.com>
> To: ltp-list@lists.sourceforge.net
> Cc: "vasily isaenko" <vasily.isae...@oracle.com>, jstan...@redhat.com
> Sent: Wednesday, 21 August, 2013 1:54:58 PM
> Subject: [PATCH V2 3/3] lib/numa_helper.c: fix nodemask_size
>
> Now nodemask_size is rounded up to the next multiple
> of sizeof(nodemask_t).
Hi,
Why multiple of nodemask_t? It can be quite large.
>
> Signed-off-by: Stanislav Kholmanskikh <stanislav.kholmansk...@oracle.com>
> ---
> testcases/kernel/lib/numa_helper.c | 6 +++---
> 1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/testcases/kernel/lib/numa_helper.c
> b/testcases/kernel/lib/numa_helper.c
> index 4157816..9151583 100644
> --- a/testcases/kernel/lib/numa_helper.c
> +++ b/testcases/kernel/lib/numa_helper.c
> @@ -60,7 +60,7 @@ unsigned long get_max_node(void)
> #if HAVE_NUMA_H
> static void get_nodemask_allnodes(nodemask_t * nodemask, unsigned long
> max_node)
> {
> - unsigned long nodemask_size = max_node / 8 + 1;
> + unsigned long nodemask_size = ALIGN(max_node, sizeof(nodemask_t)*8) / 8;
Because mask is passed as parameter, we should respect max_node and
clear only up to byte which holds max_node. So I think we should align
to next byte only:
unsigned long nodemask_size = ALIGN(max_node, 8) / 8;
> int i;
> char fn[64];
> struct stat st;
> @@ -76,7 +76,7 @@ static void get_nodemask_allnodes(nodemask_t * nodemask,
> unsigned long max_node)
> static int filter_nodemask_mem(nodemask_t * nodemask, unsigned long
> max_node)
> {
> #if MPOL_F_MEMS_ALLOWED
> - unsigned long nodemask_size = max_node / 8 + 1;
> + unsigned long nodemask_size = ALIGN(max_node, sizeof(nodemask_t)*8) / 8;
Same as above:
unsigned long nodemask_size = ALIGN(max_node, 8) / 8;
> memset(nodemask, 0, nodemask_size);
> /*
> * avoid numa_get_mems_allowed(), because of bug in getpol()
> @@ -165,7 +165,7 @@ int get_allowed_nodes_arr(int flag, int *num_nodes, int
> **nodes)
>
> #if HAVE_NUMA_H
> unsigned long max_node = get_max_node();
> - unsigned long nodemask_size = max_node / 8 + 1;
> + unsigned long nodemask_size = ALIGN(max_node, sizeof(nodemask_t)*8) / 8;
This function allocates the nodemask, so we can align to as much as we need.
I'd expect this to be same as in migrate_pages, align to next long:
unsigned long nodemask_size = ALIGN(max_node / 8, sizeof(long));
Regards,
Jan
>
> nodemask = malloc(nodemask_size);
> if (nodes)
> --
> 1.7.1
>
>
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