linux-kernel - Re: [RFC 06/18] limits: present RLIMIT_CPU and RLIMIT

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Message-ID: <CACVxJT_GOooEqFpGMRA=k7eLUzBG3YqqUqjogUnHbS3J=mYU-w@mail.gmail.com>
Date:	Tue, 14 Jun 2016 12:14:51 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	Topi Miettinen <toiwoton@...il.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Kees Cook <keescook@...omium.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	John Stultz <john.stultz@...aro.org>,
	Janis Danisevskis <jdanis@...gle.com>,
	Calvin Owens <calvinowens@...com>, Jann Horn <jann@...jh.net>
Subject: Re: [RFC 06/18] limits: present RLIMIT_CPU and RLIMIT_RTTIMER current status

On Mon, Jun 13, 2016 at 10:44 PM, Topi Miettinen <toiwoton@...il.com> wrote:
> Present current cputimer status in /proc/self/limits.

> --- a/fs/proc/base.c
> +++ b/fs/proc/base.c
> @@ -650,8 +650,30 @@ static int proc_pid_limits(struct seq_file *m, struct pid_namespace *ns,
> +               switch (i) {
> +               case RLIMIT_RTTIME:
> +               case RLIMIT_CPU:
> +                       if (rlim[i].rlim_max == RLIM_INFINITY)
> +                               seq_printf(m, "%-20s\n", "-");
> +                       else {
> +                               unsigned long long utime, ptime;
> +                               unsigned long psecs;
> +                               struct task_cputime cputime;
> +
> +                               thread_group_cputimer(task, &cputime);
> +                               utime = cputime_to_expires(cputime.utime);
> +                               ptime = utime + cputime_to_expires(cputime.stime);
> +                               psecs = cputime_to_secs(ptime);
> +                               if (i == RLIMIT_RTTIME)
> +                                       psecs *= USEC_PER_SEC;
> +                               seq_printf(m, "%-20lu\n", psecs);
> +                       }
> +                       break;

Let's keep rlimits file for rlimits.