On 2015/1/31 2:54, Jason Low wrote:
> The cpuset.sched_relax_domain_level can control how far we do
> immediate load balancing on a system. However, it was found on recent
> kernels that echo'ing a value into cpuset.sched_relax_domain_level
> did not reduce any immediate load balancing.
>
> The reason this occurred was because the update_domain_attr_tree() traversal
> did not update for the "top_cpuset". This resulted in nothing being changed
> when modifying the sched_relax_domain_level parameter.
>
> This patch is able to address that problem by having update_domain_attr_tree()
> allow updates for the root in the cpuset traversal.
>
> Fixes: fc560a26acce ("cpuset: replace cpuset->stack_list with cpuset_for_each_descendant_pre()")
> Cc: <stable@xxxxxxxxxxxxxxx> # 3.9+
> Signed-off-by: Jason Low <jason.low2@xxxxxx>
Acked-by: Zefan Li <lizefan@xxxxxxxxxx>
> ---
> kernel/cpuset.c | 3 ---
> 1 files changed, 0 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/cpuset.c b/kernel/cpuset.c
> index 64b257f..b589e57 100644
> --- a/kernel/cpuset.c
> +++ b/kernel/cpuset.c
> @@ -548,9 +548,6 @@ static void update_domain_attr_tree(struct sched_domain_attr *dattr,
>
> rcu_read_lock();
> cpuset_for_each_descendant_pre(cp, pos_css, root_cs) {
> - if (cp == root_cs)
> - continue;
> -
> /* skip the whole subtree if @cp doesn't have any CPU */
> if (cpumask_empty(cp->cpus_allowed)) {
> pos_css = css_rightmost_descendant(pos_css);
>
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