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process: transfer TIDs in bulk and reuse them locally

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This commit is contained in:
Balazs Gerofi
2016-08-02 16:59:04 +09:00
parent dac6f2883e
commit 6aae35cb3d
5 changed files with 122 additions and 9 deletions
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62
kernel/syscall.c
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@@ -1478,8 +1478,8 @@ SYSCALL_DECLARE(getppid)
return thread->proc->ppid_parent->pid;
}
void
settid(struct thread *thread, int mode, int newcpuid, int oldcpuid)
void settid(struct thread *thread, int mode, int newcpuid, int oldcpuid,
int nr_tids, int *tids)
{
struct syscall_request request IHK_DMA_ALIGN;
unsigned long rc;
@@ -1489,6 +1489,12 @@ settid(struct thread *thread, int mode, int newcpuid, int oldcpuid)
request.args[1] = thread->proc->pid;
request.args[2] = newcpuid;
request.args[3] = oldcpuid;
/*
* If nr_tids is non-zero, tids should point to an array of ints
* where the thread ids of the mcexec process are expected.
*/
request.args[4] = nr_tids;
request.args[5] = virt_to_phys(tids);
rc = do_syscall(&request, ihk_mc_get_processor_id(), thread->proc->pid);
if (mode != 2) {
thread->tid = rc;
@@ -1893,7 +1899,55 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
&new->vm->address_space->cpu_set_lock);
if (clone_flags & CLONE_VM) {
settid(new, 1, cpuid, -1);
int *tids = NULL;
int i;
struct mcs_rwlock_node_irqsave lock;
mcs_rwlock_writer_lock(&newproc->threads_lock, &lock);
/* Obtain mcexec TIDs if not known yet */
if (!newproc->nr_tids) {
tids = kmalloc(sizeof(int) * num_processors, IHK_MC_AP_NOWAIT);
if (!tids) {
mcs_rwlock_writer_unlock(&newproc->threads_lock, &lock);
release_cpuid(cpuid);
return -ENOMEM;
}
newproc->tids = kmalloc(sizeof(struct mcexec_tid) * num_processors, IHK_MC_AP_NOWAIT);
if (!newproc->tids) {
mcs_rwlock_writer_unlock(&newproc->threads_lock, &lock);
kfree(tids);
release_cpuid(cpuid);
return -ENOMEM;
}
settid(new, 1, cpuid, -1, num_processors, tids);
for (i = 0; (i < num_processors) && tids[i]; ++i) {
dkprintf("%s: tid[%d]: %d\n", __FUNCTION__, i, tids[i]);
newproc->tids[i].tid = tids[i];
newproc->tids[i].thread = NULL;
++newproc->nr_tids;
}
}
/* Find an unused TID */
for (i = 0; i < newproc->nr_tids; ++i) {
if (!newproc->tids[i].thread) {
newproc->tids[i].thread = new;
new->tid = newproc->tids[i].tid;
dkprintf("%s: tid %d assigned to %p\n", __FUNCTION__, new->tid, new);
break;
}
}
/* TODO: spawn more mcexec threads */
if (!new->tid) {
kprintf("%s: no more TIDs available\n");
panic("");
}
mcs_rwlock_writer_unlock(&newproc->threads_lock, &lock);
}
/* fork() a new process on the host */
else {
@@ -1913,7 +1967,7 @@ unsigned long do_fork(int clone_flags, unsigned long newsp,
}
/* In a single threaded process TID equals to PID */
settid(new, 0, cpuid, -1);
settid(new, 0, cpuid, -1, 0, NULL);
new->vm->address_space->pids[0] = new->proc->pid;
dkprintf("fork(): new pid: %d\n", new->proc->pid);