Timur Davydov has uploaded this change for review. ( https://gerrit.osmocom.org/c/libosmocore/+/42653?usp=email )

Change subject: vty: make CPU scheduling optional based on platform support ......................................................................

vty: make CPU scheduling optional based on platform support

Add configure checks for sched_* APIs and guard their usage in cpu_sched_vty with HAVE_SCHED_* macros.

If scheduler functions are not available, return -ENOTSUP instead of failing at build time.

Also change osmo_cpu_sched_vty_init() to return int.

This improves portability on platforms lacking full sched support (e.g. non-Linux or restricted environments).

Change-Id: Ic5b7e39fac16531d370cb81f769ba87fef18cb81 --- M configure.ac M include/osmocom/vty/cpu_sched_vty.h M src/vty/cpu_sched_vty.c 3 files changed, 15 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/libosmocore refs/changes/53/42653/1

diff --git a/configure.ac b/configure.ac index b5f858f..cde4446 100644 --- a/configure.ac +++ b/configure.ac @@ -162,6 +162,10 @@ AC_CHECK_HEADERS([sched.h sys/mount.h sys/param.h]) AC_CHECK_FUNCS([setns unshare mount])

+dnl Check the scheduller functions +AC_CHECK_HEADERS([sched.h]) +AC_CHECK_FUNCS([sched_setaffinity sched_setscheduler sched_getaffinity]) + dnl Check whether CLONE_NEWNET is available AC_CHECK_DECL([CLONE_NEWNET], [AC_DEFINE([HAVE_CLONE_NEWNET], [1], diff --git a/include/osmocom/vty/cpu_sched_vty.h b/include/osmocom/vty/cpu_sched_vty.h index 171f168..b04ee34 100644 --- a/include/osmocom/vty/cpu_sched_vty.h +++ b/include/osmocom/vty/cpu_sched_vty.h @@ -31,7 +31,7 @@ * \file cpu_sched_vty.h */

-void osmo_cpu_sched_vty_init(void *tall_ctx); +int osmo_cpu_sched_vty_init(void *tall_ctx); int osmo_cpu_sched_vty_apply_localthread(void);

/*! @} */ diff --git a/src/vty/cpu_sched_vty.c b/src/vty/cpu_sched_vty.c index 4f3eeb1..a712860 100644 --- a/src/vty/cpu_sched_vty.c +++ b/src/vty/cpu_sched_vty.c @@ -331,6 +331,7 @@ static int my_sched_setaffinity(enum sched_vty_thread_id tid_type, pid_t pid, cpu_set_t *cpuset, size_t cpuset_size) { +#ifdef HAVE_SCHED_SETAFFINITY DIR *proc_dir; struct dirent *entry; char dirname[100]; @@ -369,7 +370,9 @@

closedir(proc_dir); return rc; - +#else /* HAVE_SCHED_SETAFFINITY */ + return -ENOTSUP; +#endif /* HAVE_SCHED_SETAFFINITY */ }

DEFUN_ATTR(cfg_sched_cpu_affinity, cfg_sched_cpu_affinity_cmd, @@ -464,6 +467,7 @@

static int set_sched_rr(unsigned int prio) { +#ifdef HAVE_SCHED_SETSCHEDULER struct sched_param param; int rc; memset(&param, 0, sizeof(param)); @@ -476,6 +480,9 @@ return -1; } return 0; +#else /* HAVE_SCHED_SETSCHEDULER */ + return -ENOTSUP; +#endif /* HAVE_SCHED_SETSCHEDULER */ }

DEFUN_ATTR(cfg_sched_policy, cfg_sched_policy_cmd, @@ -558,10 +565,12 @@ cpuset = CPU_ALLOC(get_num_cpus()); cpuset_size = CPU_ALLOC_SIZE(get_num_cpus()); CPU_ZERO_S(cpuset_size, cpuset); +#ifdef HAVE_SCHED_GETAFFINITY if (sched_getaffinity(tid_it, cpuset_size, cpuset) == 0) { if (generate_cpu_hex_mask(str_mask, sizeof(str_mask), cpuset, cpuset_size) < 0) str_mask[0] = '\0'; } +#endif /* HAVE_SCHED_GETAFFINITY */ CPU_FREE(cpuset);

vty_out(vty, " TID: %lu, NAME: '%s', cpu-affinity: %s%s",