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Add allow_oversubscribe kernel argument

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It's not allowed in the default setting.
Execute mcreboot.sh with -O option to allow it.

refs #1072
This commit is contained in:
Masamichi Takagi
2018-03-10 13:08:38 +09:00
parent b1ea6eb82a
commit fe42481d6f
5 changed files with 19 additions and 2 deletions
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6
kernel/syscall.c
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@@ -2343,6 +2343,7 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
struct syscall_request request1 IHK_DMA_ALIGN;
int ptrace_event = 0;
int termsig = clone_flags & 0x000000ff;
const struct ihk_mc_cpu_info *cpu_info = ihk_mc_get_cpu_info();
dkprintf("do_fork,flags=%08x,newsp=%lx,ptidptr=%lx,ctidptr=%lx,tls=%lx,curpc=%lx,cursp=%lx",
clone_flags, newsp, parent_tidptr, child_tidptr, tlsblock_base, curpc, cursp);
@@ -2382,6 +2383,11 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
return -EINVAL;
}
if (!allow_oversubscribe && rusage->num_threads >= cpu_info->ncpus) {
kprintf("%s: ERROR: CPU oversubscription is not allowed. Specify -O option in mcreboot.sh to allow it.\n", __FUNCTION__);
return -EINVAL;
}
cpuid = obtain_clone_cpuid(&old->cpu_set);
if (cpuid == -1) {
kprintf("do_fork,core not available\n");