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migration/postcopy: Wake rate limit sleep on postcopy request 

Use the 'urgent request' mechanism added in the previous patch
for entries added to the postcopy request queue for RAM.  Ignore
the rate limiting while we have requests.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Message-Id: <20180613102642.23995-4-dgilbert@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
This commit is contained in:
Dr. David Alan Gilbert 2018-06-13 11:26:42 +01:00
parent ad767bed5a
commit e03a34f8f3
1 changed files with 8 additions and 1 deletions
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9
migration/ram.c
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@ -1547,6 +1547,7 @@ static RAMBlock *unqueue_page(RAMState *rs, ram_addr_t *offset)
memory_region_unref(block->mr);
QSIMPLEQ_REMOVE_HEAD(&rs->src_page_requests, next_req);
g_free(entry);
migration_consume_urgent_request();
}
}
qemu_mutex_unlock(&rs->src_page_req_mutex);
@ -1695,6 +1696,7 @@ int ram_save_queue_pages(const char *rbname, ram_addr_t start, ram_addr_t len)
memory_region_ref(ramblock->mr);
qemu_mutex_lock(&rs->src_page_req_mutex);
QSIMPLEQ_INSERT_TAIL(&rs->src_page_requests, new_entry, next_req);
migration_make_urgent_request();
qemu_mutex_unlock(&rs->src_page_req_mutex);
rcu_read_unlock();
@ -2643,9 +2645,14 @@ static int ram_save_iterate(QEMUFile *f, void *opaque)
t0 = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
i = 0;
while ((ret = qemu_file_rate_limit(f)) == 0) {
while ((ret = qemu_file_rate_limit(f)) == 0 ||
!QSIMPLEQ_EMPTY(&rs->src_page_requests)) {
int pages;
if (qemu_file_get_error(f)) {
break;
}
pages = ram_find_and_save_block(rs, false);
/* no more pages to sent */
if (pages == 0) {