On 18.05.2020 18:14, Andrey Ryabinin wrote:
> Add "css_stacks" parameter to kernel's command line to enable css_stacks
> debug at boot.
>
> https://jira.sw.ru/browse/PSBM-98148
> Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Reviewed-by: Kirill Tkhai <ktk...@virtuozzo.com>
> ---
> kernel/cgroup.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 17ba1ab9c7b0..bf218e88ac9d 100644
> --- a/kernel/cgroup.c
> +++ b/kernel/cgroup.c
> @@ -4192,6 +4192,7 @@ static int css_stacks_set(void *data, u64 val)
> DEFINE_SIMPLE_ATTRIBUTE(css_stacks_fops,
> css_stacks_get, css_stacks_set, "%llu\n");
>
> +int setup_css_stacks_cmd;
> static int __init css_stacks_debugfs(void)
> {
> void *ret;
> @@ -4200,9 +4201,18 @@ static int __init css_stacks_debugfs(void)
> &css_stacks_fops);
> if (!ret)
> pr_warn("Failed to create css_stacks in debugfs");
> + if (setup_css_stacks_cmd)
> + static_key_slow_inc(&css_stacks_on);
> return 0;
> }
> late_initcall(css_stacks_debugfs);
> +
> +static int __init setup_css_stacks(char *str)
> +{
> + setup_css_stacks_cmd = 1;
> + return 1;
> +}
> +__setup("css_stacks", setup_css_stacks);
> #endif
>
> static void init_cgroup_css(struct cgroup_subsys_state *css,
>
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