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uti: Workaround not to share CPU with OpenMP threads

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* Assign uti thread to the last idle CPU so that it's not shared with
  an OpenMP thread

Change-Id: Ia42cae056ce81fde9b6dab6286b39a52f3c9e172
This commit is contained in:
Masamichi Takagi
2018-09-03 18:08:03 +09:00
parent dbba7dea18
commit 5cb8a1f10f
8 changed files with 34 additions and 14 deletions
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12
kernel/syscall.c
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@ -2445,12 +2445,6 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
return -EINVAL;
}
cpuid = obtain_clone_cpuid(&old->cpu_set);
if (cpuid == -1) {
kprintf("do_fork,core not available\n");
return -EAGAIN;
}
/* N-th creation put the new on Linux CPU. It's turned off when zero is
set to uti_thread_rank. */
if (oldproc->uti_thread_rank) {
@ -2463,6 +2457,12 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
}
}
cpuid = obtain_clone_cpuid(&old->cpu_set, old->mod_clone == SPAWN_TO_REMOTE && oldproc->uti_use_last_cpu);
if (cpuid == -1) {
kprintf("do_fork,core not available\n");
return -EAGAIN;
}
new = clone_thread(old, curpc,
newsp ? newsp : cursp, clone_flags);