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    SubjectRe: [PATCH]: proc: export a processes resource limits via proc/<pid>
    On Mon, Aug 13, 2007 at 09:25:45PM +0200, Ingo Oeser wrote:
    > Hi Neil,
    >
    > > +static struct limit_names lnames[RLIM_NLIMITS] = {
    > static const ...
    >
    > may be better here.
    >
    > Best Regards
    >
    > Ingo Oeser


    No, objections, thats all read only data anyway. New patch attached

    Regards
    Neil


    Signed-off-by: Neil Horman <nhorman@tuxdriver.com>

    base.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 file changed, 65 insertions(+)



    diff --git a/fs/proc/base.c b/fs/proc/base.c
    index ed2b224..b3ddf08 100644
    --- a/fs/proc/base.c
    +++ b/fs/proc/base.c
    @@ -74,6 +74,7 @@
    #include <linux/nsproxy.h>
    #include <linux/oom.h>
    #include <linux/elf.h>
    +#include <asm/resource.h>
    #include "internal.h"

    /* NOTE:
    @@ -323,6 +324,68 @@ static int proc_oom_score(struct task_struct *task, char *buffer)
    return sprintf(buffer, "%lu\n", points);
    }

    +struct limit_names {
    + char *name;
    + char *unit;
    +};
    +
    +static const struct limit_names lnames[RLIM_NLIMITS] = {
    + [RLIMIT_CPU] = {"Max cpu time", "ms"},
    + [RLIMIT_FSIZE] = {"Max file size", "bytes"},
    + [RLIMIT_DATA] = {"Max data size", "bytes"},
    + [RLIMIT_STACK] = {"Max stack size", "bytes"},
    + [RLIMIT_CORE] = {"Max core file size", "bytes"},
    + [RLIMIT_RSS] = {"Max resident set", "bytes"},
    + [RLIMIT_NPROC] = {"Max processes", "processes"},
    + [RLIMIT_NOFILE] = {"Max open files", "files"},
    + [RLIMIT_MEMLOCK] = {"Max locked memory", "bytes"},
    + [RLIMIT_AS] = {"Max address space", "bytes"},
    + [RLIMIT_LOCKS] = {"Max file locks", "locks"},
    + [RLIMIT_SIGPENDING] = {"Max pending signals", "signals"},
    + [RLIMIT_MSGQUEUE] = {"Max msgqueue size", "bytes"},
    + [RLIMIT_NICE] = {"Max nice priority", NULL},
    + [RLIMIT_RTPRIO] = {"Max realtime priority", NULL},
    +};
    +
    +/* Display limits for a process */
    +static int proc_pid_limits(struct task_struct *task, char *buffer)
    +{
    + unsigned int i;
    + int count = 0;
    + char *bufptr = buffer;
    +
    + struct rlimit rlim[RLIM_NLIMITS];
    +
    + read_lock(&tasklist_lock);
    + memcpy(rlim, task->signal->rlim, (sizeof(struct rlimit) * RLIM_NLIMITS));
    + read_unlock(&tasklist_lock);
    +
    + /*
    + * print the file header
    + */
    + count += sprintf(&bufptr[count], "%-25s %-20s %-20s %-10s\n",
    + "Limit","Soft Limit","Hard Limit","Units");
    +
    + for (i=0; i < RLIM_NLIMITS; i++) {
    + if (rlim[i].rlim_cur == RLIM_INFINITY)
    + count += sprintf(&bufptr[count], "%-25s %-20s ", lnames[i].name,"unlimited");
    + else
    + count += sprintf(&bufptr[count], "%-25s %-20lu ", lnames[i].name, rlim[i].rlim_cur);
    +
    + if (rlim[i].rlim_max == RLIM_INFINITY)
    + count += sprintf(&bufptr[count], "%-20s ","unlimited");
    + else
    + count += sprintf(&bufptr[count], "%-20lu ", rlim[i].rlim_max);
    +
    + if (lnames[i].unit)
    + count += sprintf(&bufptr[count],"%-10s\n", lnames[i].unit);
    + else
    + count += sprintf(&bufptr[count],"\n");
    + }
    +
    + return count;
    +}
    +
    /************************************************************************/
    /* Here the fs part begins */
    /************************************************************************/
    @@ -2017,6 +2080,7 @@ static const struct pid_entry tgid_base_stuff[] = {
    INF("environ", S_IRUSR, pid_environ),
    INF("auxv", S_IRUSR, pid_auxv),
    INF("status", S_IRUGO, pid_status),
    + INF("limits", S_IRUSR, pid_limits),
    #ifdef CONFIG_SCHED_DEBUG
    REG("sched", S_IRUGO|S_IWUSR, pid_sched),
    #endif
    @@ -2310,6 +2374,7 @@ static const struct pid_entry tid_base_stuff[] = {
    INF("environ", S_IRUSR, pid_environ),
    INF("auxv", S_IRUSR, pid_auxv),
    INF("status", S_IRUGO, pid_status),
    + INF("limits", S_IRUSR, pid_limits),
    #ifdef CONFIG_SCHED_DEBUG
    REG("sched", S_IRUGO|S_IWUSR, pid_sched),
    #endif
    --
    /***************************************************
    *Neil Horman
    *Software Engineer
    *Red Hat, Inc.
    *nhorman@tuxdriver.com
    *gpg keyid: 1024D / 0x92A74FA1
    *http://pgp.mit.edu
    ***************************************************/
    -
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