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realtime: request SCHED_RR using CAP_SYS_NICE

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Try to gain SCHED_RR (round-robin) realtime scheduling privileges before
starting the server. This requires CAP_SYS_NICE on Linux systems.
We additionally register a pthread_atfork callback which resets the
scheduling class back to SCHED_OTHER (the Linux system default).

Due to CAP_SYS_NICE, setting RLIMIT_RTPRIO has no effect on the process
as documented within man 7 sched (from Linux):

  Privileged (CAP_SYS_NICE) threads ignore the RLIMIT_RTPRIO limit;
  as with older kernels, they can make arbitrary changes to
  scheduling policy and priority. See getrlimit(2) for further
  information on RLIMIT_RTPRIO

Note that this requires the sway distribution packagers to set the
CAP_SYS_NICE capability on the sway binary.

Supersedes #6992
This commit is contained in:
Rouven Czerwinski 2022-05-13 20:30:19 +02:00 • committed by Kenny Levinsen
parent 3f600565e4
commit a3a82efbf6
4 changed files with 45 additions and 0 deletions
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include/sway/server.h
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@ -173,4 +173,6 @@ void handle_pointer_constraint(struct wl_listener *listener, void *data);
void xdg_activation_v1_handle_request_activate(struct wl_listener *listener,
void *data);
void set_rr_scheduling(void);
#endif