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migration/multifd: Implement zero page transmission on the multifd thread.

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1. Add zero_pages field in MultiFDPacket_t.
2. Implements the zero page detection and handling on the multifd
threads for non-compression, zlib and zstd compression backends.
3. Added a new value 'multifd' in ZeroPageDetection enumeration.
4. Adds zero page counters and updates multifd send/receive tracing
format to track the newly added counters.

Signed-off-by: Hao Xiang <hao.xiang@bytedance.com>
Acked-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/r/20240311180015.3359271-5-hao.xiang@linux.dev
Signed-off-by: Peter Xu <peterx@redhat.com>
This commit is contained in:
Hao Xiang 2024-03-11 18:00:12 +00:00 • committed by Peter Xu
parent 5fdbb1dfcc
commit 303e6f54f9
10 changed files with 228 additions and 32 deletions
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21
migration/multifd-zlib.c
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@ -123,13 +123,15 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
int ret;
uint32_t i;
multifd_send_prepare_header(p);
if (!multifd_send_prepare_common(p)) {
goto out;
}
for (i = 0; i < pages->num; i++) {
for (i = 0; i < pages->normal_num; i++) {
uint32_t available = z->zbuff_len - out_size;
int flush = Z_NO_FLUSH;
if (i == pages->num - 1) {
if (i == pages->normal_num - 1) {
flush = Z_SYNC_FLUSH;
}
@ -172,10 +174,10 @@ static int zlib_send_prepare(MultiFDSendParams *p, Error **errp)
p->iov[p->iovs_num].iov_len = out_size;
p->iovs_num++;
p->next_packet_size = out_size;
out:
p->flags |= MULTIFD_FLAG_ZLIB;
multifd_send_fill_packet(p);
return 0;
}
@ -261,6 +263,14 @@ static int zlib_recv(MultiFDRecvParams *p, Error **errp)
p->id, flags, MULTIFD_FLAG_ZLIB);
return -1;
}
multifd_recv_zero_page_process(p);
if (!p->normal_num) {
assert(in_size == 0);
return 0;
}
ret = qio_channel_read_all(p->c, (void *)z->zbuff, in_size, errp);
if (ret != 0) {
@ -310,6 +320,7 @@ static int zlib_recv(MultiFDRecvParams *p, Error **errp)
p->id, out_size, expected_size);
return -1;
}
return 0;
}