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/* Trigger a page-in in a separate thread-of-execution to avoid deadlock */
#include <pthread.h>
#include <xc_private.h>
#include "xenpaging.h"
struct page_in_args {
domid_t dom;
unsigned long *pagein_queue;
xc_interface *xch;
};
static struct page_in_args page_in_args;
static unsigned long page_in_request;
static unsigned int page_in_possible;
static pthread_t page_in_thread;
static pthread_cond_t page_in_cond = PTHREAD_COND_INITIALIZER;
static pthread_mutex_t page_in_mutex = PTHREAD_MUTEX_INITIALIZER;
static void *page_in(void *arg)
{
struct page_in_args *pia = arg;
void *page;
int i, num;
xen_pfn_t gfns[XENPAGING_PAGEIN_QUEUE_SIZE];
while (1)
{
pthread_mutex_lock(&page_in_mutex);
while (!page_in_request)
pthread_cond_wait(&page_in_cond, &page_in_mutex);
num = 0;
for (i = 0; i < XENPAGING_PAGEIN_QUEUE_SIZE; i++)
{
if (!pia->pagein_queue[i])
continue;
gfns[num] = pia->pagein_queue[i];
pia->pagein_queue[i] = 0;
num++;
}
page_in_request = 0;
pthread_mutex_unlock(&page_in_mutex);
/* Ignore errors */
page = xc_map_foreign_pages(pia->xch, pia->dom, PROT_READ, gfns, num);
if (page)
munmap(page, PAGE_SIZE * num);
}
page_in_possible = 0;
pthread_exit(NULL);
}
void page_in_trigger(void)
{
if (!page_in_possible)
return;
pthread_mutex_lock(&page_in_mutex);
page_in_request = 1;
pthread_mutex_unlock(&page_in_mutex);
pthread_cond_signal(&page_in_cond);
}
void create_page_in_thread(struct xenpaging *paging)
{
page_in_args.dom = paging->mem_event.domain_id;
page_in_args.pagein_queue = paging->pagein_queue;
page_in_args.xch = paging->xc_handle;
if (pthread_create(&page_in_thread, NULL, page_in, &page_in_args) == 0)
page_in_possible = 1;
}
/*
* Local variables:
* mode: C
* c-file-style: "BSD"
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
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