[Devel] Re: [PATCH 4/5] pid: use namespaced iteration on processes while sending signal to all

[Serge E. Hallyn]

Quoting Gowrishankar M (gowrishankar.m at linux.vnet.ibm.com):
> From: Gowrishankar M <gomuthuk at linux.vnet.ibm.com>
> 
> At present we scan all processes in init namespace, whether in new namespace
> or not, to send signal to all processes for container. Also we filter out
> processes belonging to same namespace using task_pid_vnr().
> 
> Below patch proposes to use new macro controller to save time using pidmap.
> In init namespace, this saving can be more or less achieved, as we check to
> take every process with task_pid_vnr() otherwise.
> 
> Signed-off-by: Gowrishankar M <gowrishankar.m at linux.vnet.ibm.com>

Acked-by: Serge Hallyn <serue at us.ibm.com>

> ---
>  kernel/signal.c |    5 ++---
>  1 files changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/signal.c b/kernel/signal.c
> index 4530fc6..a2651bc 100644
> --- a/kernel/signal.c
> +++ b/kernel/signal.c
> @@ -1143,9 +1143,8 @@ static int kill_something_info(int sig, struct siginfo *info, pid_t pid)
>  		int retval = 0, count = 0;
>  		struct task_struct * p;
> 
> -		for_each_process(p) {
> -			if (task_pid_vnr(p) > 1 &&
> -					!same_thread_group(p, current)) {
> +		for_each_process_in_ns(p, current->nsproxy->pid_ns) {
> +			if (!same_thread_group(p, current)) {
>  				int err = group_send_sig_info(sig, info, p);
>  				++count;
>  				if (err != -EPERM)
> -- 
> 1.5.5.1
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