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Make clone system-call create a new thread on the next available physical core

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and skip the physical core with a system process so that
programs using Intel OpenMP bind threads to cores in that manner.
This commit is contained in:
Masamichi Takagi m-takagi@ab.jp.nec.com
2013-07-05 18:55:03 +09:00
parent b59be07e9a
commit 4214441ac3
3 changed files with 56 additions and 14 deletions
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17
kernel/syscall.c
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@@ -487,27 +487,16 @@ SYSCALL_DECLARE(arch_prctl)
SYSCALL_DECLARE(clone)
{
int i;
int cpuid = -1;
int cpuid;
int clone_flags = ihk_mc_syscall_arg0(ctx);
struct ihk_mc_cpu_info *cpu_info = ihk_mc_get_cpu_info();
struct process *new;
dkprintf("[%d] clone(): stack_pointr: 0x%lX\n",
ihk_mc_get_processor_id(),
(unsigned long)ihk_mc_syscall_arg1(ctx));
//ihk_mc_spinlock_lock_noirq(&cpu_status_lock);
for (i = 0; i < cpu_info->ncpus; i++) {
if (get_cpu_local_var(i)->status == CPU_STATUS_IDLE) {
cpuid = i;
break;
}
}
cpuid = obtain_clone_cpuid();
if (cpuid < 0)
return -EAGAIN;
new = clone_process(cpu_local_var(current), ihk_mc_syscall_pc(ctx),
ihk_mc_syscall_arg1(ctx));
@@ -546,7 +535,7 @@ SYSCALL_DECLARE(clone)
ihk_mc_syscall_ret(new->uctx) = 0;
dkprintf("clone: kicking scheduler!\n");
dkprintf("clone: kicking scheduler!,cpuid=%d\n", cpuid);
runq_add_proc(new, cpuid);
return new->pid;