core: in execute, Never fail setting Nice priority
Instead, push to the closest possible Nice priority setting. Replaces: #11397
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6bbeef2042
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390902012c
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@ -22,6 +22,7 @@
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#include "alloc-util.h"
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#include "architecture.h"
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#include "env-util.h"
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#include "errno-util.h"
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#include "escape.h"
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#include "fd-util.h"
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#include "fileio.h"
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@ -1527,6 +1528,62 @@ int pidfd_get_pid(int fd, pid_t *ret) {
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return parse_pid(p, ret);
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}
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static int rlimit_to_nice(rlim_t limit) {
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if (limit <= 1)
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return PRIO_MAX-1; /* i.e. 19 */
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if (limit >= -PRIO_MIN + PRIO_MAX)
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return PRIO_MIN; /* i.e. -20 */
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return PRIO_MAX - (int) limit;
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}
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int setpriority_closest(int priority) {
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int current, limit, saved_errno;
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struct rlimit highest;
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/* Try to set requested nice level */
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if (setpriority(PRIO_PROCESS, 0, priority) >= 0)
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return 1;
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/* Permission failed */
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saved_errno = -errno;
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if (!ERRNO_IS_PRIVILEGE(saved_errno))
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return saved_errno;
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errno = 0;
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current = getpriority(PRIO_PROCESS, 0);
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if (errno != 0)
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return -errno;
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if (priority == current)
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return 1;
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/* Hmm, we'd expect that raising the nice level from our status quo would always work. If it doesn't,
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* then the whole setpriority() system call is blocked to us, hence let's propagate the error
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* right-away */
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if (priority > current)
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return saved_errno;
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if (getrlimit(RLIMIT_NICE, &highest) < 0)
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return -errno;
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limit = rlimit_to_nice(highest.rlim_cur);
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/* We are already less nice than limit allows us */
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if (current < limit) {
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log_debug("Cannot raise nice level, permissions and the resource limit do not allow it.");
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return 0;
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}
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/* Push to the allowed limit */
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if (setpriority(PRIO_PROCESS, 0, limit) < 0)
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return -errno;
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log_debug("Cannot set requested nice level (%i), used next best (%i).", priority, limit);
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return 0;
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}
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static const char *const ioprio_class_table[] = {
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[IOPRIO_CLASS_NONE] = "none",
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[IOPRIO_CLASS_RT] = "realtime",
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@ -200,3 +200,5 @@ assert_cc(TASKS_MAX <= (unsigned long) PID_T_MAX);
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})
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int pidfd_get_pid(int fd, pid_t *ret);
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int setpriority_closest(int priority);
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@ -3236,11 +3236,11 @@ static int exec_child(
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}
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}
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if (context->nice_set)
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if (setpriority(PRIO_PROCESS, 0, context->nice) < 0) {
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*exit_status = EXIT_NICE;
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return log_unit_error_errno(unit, errno, "Failed to set up process scheduling priority (nice level): %m");
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}
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if (context->nice_set) {
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r = setpriority_closest(context->nice);
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if (r < 0)
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return log_unit_error_errno(unit, r, "Failed to set up process scheduling priority (nice level): %m");
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}
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if (context->cpu_sched_set) {
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struct sched_param param = {
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