On Mon, 17 Aug 2015, Jiang Liu wrote:
> Function profile_cpu_callback() allocates memory without specifying
> __GFP_THISNODE flag, so replace cpu_to_mem() with cpu_to_node()
> because cpu_to_mem() may cause suboptimal memory allocation if
> there's no free memory on the node returned by cpu_to_mem().
>
Why is cpu_to_node() better with regard to free memory and NUMA locality?
> It's safe to use cpu_to_mem() because build_all_zonelists() also
> builds suitable fallback zonelist for memoryless node.
>
Why reference that cpu_to_mem() is safe if you're changing away from it?
> Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxxxxxxx>
> ---
> kernel/profile.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/kernel/profile.c b/kernel/profile.c
> index a7bcd28d6e9f..d14805bdcc4c 100644
> --- a/kernel/profile.c
> +++ b/kernel/profile.c
> @@ -336,7 +336,7 @@ static int profile_cpu_callback(struct notifier_block *info,
> switch (action) {
> case CPU_UP_PREPARE:
> case CPU_UP_PREPARE_FROZEN:
> - node = cpu_to_mem(cpu);
> + node = cpu_to_node(cpu);
> per_cpu(cpu_profile_flip, cpu) = 0;
> if (!per_cpu(cpu_profile_hits, cpu)[1]) {
> page = alloc_pages_exact_node(node,
--
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