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xpmem: support for fork()

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refs #925
This commit is contained in:
Ken Sato
2018-02-22 09:37:48 +09:00
parent c9157f273f
commit c260b5c6f3
18 changed files with 1449 additions and 38 deletions
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93
kernel/xpmem.c
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@ -34,7 +34,6 @@
#include <ihk/mm.h>
#include <xpmem_private.h>
struct xpmem_partition *xpmem_my_part = NULL; /* pointer to this partition */
@ -107,6 +106,7 @@ int xpmem_open(
mckfd->sig_no = -1;
mckfd->ioctl_cb = xpmem_ioctl;
mckfd->close_cb = xpmem_close;
mckfd->dup_cb = xpmem_dup;
mckfd->data = (long)proc;
irqstate = ihk_mc_spinlock_lock(&proc->mckfd_lock);
@ -276,16 +276,11 @@ static int xpmem_ioctl(
return -EINVAL;
}
static int xpmem_close(
struct mckfd *mckfd,
ihk_mc_user_context_t *ctx)
{
int n_opened;
struct process *proc = (struct process *)mckfd->data;
struct xpmem_thread_group *tg;
int index;
struct mcs_rwlock_node_irqsave lock;
XPMEM_DEBUG("call: fd=%d, pid=%d, rgid=%d",
mckfd->fd, proc->pid, proc->rgid);
@ -293,37 +288,11 @@ static int xpmem_close(
n_opened = ihk_atomic_dec_return(&xpmem_my_part->n_opened);
XPMEM_DEBUG("n_opened=%d", n_opened);
index = xpmem_tg_hashtable_index(proc->pid);
mcs_rwlock_writer_lock(&xpmem_my_part->tg_hashtable[index].lock, &lock);
tg = xpmem_tg_ref_by_tgid_all_nolock(proc->pid);
if (IS_ERR(tg)) {
mcs_rwlock_writer_unlock(
&xpmem_my_part->tg_hashtable[index].lock, &lock);
return 0;
if (mckfd->data) {
/* release my xpmem-objects */
xpmem_flush(mckfd);
}
list_del_init(&tg->tg_hashlist);
mcs_rwlock_writer_unlock(&xpmem_my_part->tg_hashtable[index].lock,
&lock);
XPMEM_DEBUG("tg->vm=0x%p", tg->vm);
ihk_mc_spinlock_lock_noirq(&tg->lock);
tg->flags |= XPMEM_FLAG_DESTROYING;
ihk_mc_spinlock_unlock_noirq(&tg->lock);
xpmem_release_aps_of_tg(tg);
xpmem_remove_segs_of_tg(tg);
ihk_mc_spinlock_lock_noirq(&tg->lock);
tg->flags |= XPMEM_FLAG_DESTROYED;
ihk_mc_spinlock_unlock_noirq(&tg->lock);
xpmem_destroy_tg(tg);
if (!n_opened) {
xpmem_exit();
}
@ -333,6 +302,15 @@ static int xpmem_close(
return 0;
}
static int xpmem_dup(
struct mckfd *mckfd,
ihk_mc_user_context_t *ctx)
{
mckfd->data = 0;
ihk_atomic_inc_return(&xpmem_my_part->n_opened);
return 0;
}
static int xpmem_init(void)
{
@ -987,6 +965,44 @@ static void xpmem_release_aps_of_tg(
XPMEM_DEBUG("return: ");
}
static void xpmem_flush(struct mckfd *mckfd)
{
struct process *proc = (struct process *)mckfd->data;
struct xpmem_thread_group *tg;
int index;
struct mcs_rwlock_node_irqsave lock;
index = xpmem_tg_hashtable_index(proc->pid);
mcs_rwlock_writer_lock(&xpmem_my_part->tg_hashtable[index].lock, &lock);
tg = xpmem_tg_ref_by_tgid_all_nolock(proc->pid);
if (IS_ERR(tg)) {
mcs_rwlock_writer_unlock(
&xpmem_my_part->tg_hashtable[index].lock, &lock);
return;
}
list_del_init(&tg->tg_hashlist);
mcs_rwlock_writer_unlock(&xpmem_my_part->tg_hashtable[index].lock,
&lock);
XPMEM_DEBUG("tg->vm=0x%p", tg->vm);
ihk_mc_spinlock_lock_noirq(&tg->lock);
tg->flags |= XPMEM_FLAG_DESTROYING;
ihk_mc_spinlock_unlock_noirq(&tg->lock);
xpmem_release_aps_of_tg(tg);
xpmem_remove_segs_of_tg(tg);
ihk_mc_spinlock_lock_noirq(&tg->lock);
tg->flags |= XPMEM_FLAG_DESTROYED;
ihk_mc_spinlock_unlock_noirq(&tg->lock);
xpmem_destroy_tg(tg);
}
static int xpmem_attach(
struct mckfd *mckfd,
@ -1431,11 +1447,12 @@ static void xpmem_detach_att(
att->at_vaddr, att->at_vaddr + 1);
if (!range || range->start > att->at_vaddr) {
DBUG_ON(1);
ihk_mc_spinlock_lock_noirq(&ap->lock);
list_del_init(&att->att_list);
ihk_mc_spinlock_unlock_noirq(&ap->lock);
mcs_rwlock_writer_unlock(&att->at_lock, &at_lock);
ihk_mc_spinlock_unlock_noirq(&vm->memory_range_lock);
ekprintf("%s: ERROR: lookup_process_memory_range() failed\n",
__FUNCTION__);
xpmem_att_destroyable(att);
XPMEM_DEBUG("return: range=%p");
return;
}