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pre-dump: call vmsplice with SPLICE_F_GIFT

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In this case, vmplice attaches pages without coping them.

Signed-off-by: Andrei Vagin <avagin@gmail.com>
This commit is contained in:
Andrei Vagin
2022-04-27 07:02:58 +03:00
parent b2bfb7745d
commit efeedf3912
1 changed files with 1 additions and 1 deletions
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criu/page-xfer.c
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@@ -822,7 +822,7 @@ int page_xfer_predump_pages(int pid, struct page_xfer *xfer, struct page_pipe *p
bufvec.iov_base = userbuf;
bufvec.iov_len = bytes_read;
ret = vmsplice(ppb->p[1], &bufvec, 1, SPLICE_F_NONBLOCK);
ret = vmsplice(ppb->p[1], &bufvec, 1, SPLICE_F_NONBLOCK | SPLICE_F_GIFT);
if (ret == -1 || ret != bytes_read) {
pr_err("vmsplice: Failed to splice user buffer to pipe %ld\n", ret);