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From: Alexey Dobriyan <adobriyan@gmail.com>
Date: Tue, 14 Jun 2016 12:14:51 +0300
Message-ID: <CACVxJT_GOooEqFpGMRA=k7eLUzBG3YqqUqjogUnHbS3J=mYU-w@mail.gmail.com>
Subject: Re: [RFC 06/18] limits: present RLIMIT_CPU and RLIMIT_RTTIMER current status
To: Topi Miettinen <toiwoton@gmail.com>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Kees Cook <keescook@chromium.org>, Al Viro <viro@zeniv.linux.org.uk>,
        John Stultz <john.stultz@linaro.org>,
        Janis Danisevskis <jdanis@google.com>,
        Calvin Owens <calvinowens@fb.com>, Jann Horn <jann@thejh.net>
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On Mon, Jun 13, 2016 at 10:44 PM, Topi Miettinen <toiwoton@gmail.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.