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page-read: introduce dup_page_read

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The dup_page_read performs a shallow copy of a page_read object. It is
required for implementation of fork event in lazy-pages daemon.
When a restored process fork()'s a child, the lazy-pages daemon will handle
page faults of the child process, and it will use the parent process memory
dump for that.

travis-ci: success for lazy-pages: add non-#PF events handling (rev2)
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Mike Rapoport 2017-02-06 13:44:11 +02:00 committed by Andrei Vagin
parent 00436b7c2b
commit fb90982db5
2 changed files with 20 additions and 0 deletions
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7
criu/include/pagemap.h
View File

@ -112,6 +112,13 @@ int pagemap_enqueue_iovec(struct page_read *pr, void *buf,
unsigned long len, struct list_head *to);
int pagemap_render_iovec(struct list_head *from, struct task_restore_args *ta);
/*
* Create a shallow copy of page_read object.
* The new object shares the pagemap structures with the original, but
* maintains its own set of references to those structures.
*/
extern void dup_page_read(struct page_read *src, struct page_read *dst);
extern int dedup_one_iovec(struct page_read *pr, unsigned long base,
unsigned long len);

13
criu/pagemap.c
View File

@ -819,3 +819,16 @@ int open_page_read(int pid, struct page_read *pr, int pr_flags)
{
return open_page_read_at(get_service_fd(IMG_FD_OFF), pid, pr, pr_flags);
}
#define DUP_IDS_BASE 1000
void dup_page_read(struct page_read *src, struct page_read *dst)
{
static int dup_ids = 1;
memcpy(dst, src, sizeof(*dst));
INIT_LIST_HEAD(&dst->async);
dst->id = src->id + DUP_IDS_BASE * dup_ids++;
dst->reset(dst);
}