aboutsummaryrefslogtreecommitdiff
diff options
context:
space:
mode:
authorPeter Xu <peterx@redhat.com>2018-05-02 18:47:33 +0800
committerJuan Quintela <quintela@redhat.com>2018-05-15 20:56:59 +0200
commit08614f34977a18fdc06c56f4e12b6cf47c06da57 (patch)
treef9adcef1f7fa7bbfeddeb4708e82818474f7a90e
parentedd090c72825b483df4de6a525d430d7635a5d8e (diff)
migration: setup ramstate for resume
After we updated the dirty bitmaps of ramblocks, we also need to update the critical fields in RAMState to make sure it is ready for a resume. Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Peter Xu <peterx@redhat.com> Message-Id: <20180502104740.12123-18-peterx@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
-rw-r--r--migration/ram.c45
-rw-r--r--migration/trace-events1
2 files changed, 45 insertions, 1 deletions
diff --git a/migration/ram.c b/migration/ram.c
index b16eabcfb9..5bcbf7a9f9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -2491,6 +2491,41 @@ static int ram_init_all(RAMState **rsp)
return 0;
}
+static void ram_state_resume_prepare(RAMState *rs, QEMUFile *out)
+{
+ RAMBlock *block;
+ uint64_t pages = 0;
+
+ /*
+ * Postcopy is not using xbzrle/compression, so no need for that.
+ * Also, since source are already halted, we don't need to care
+ * about dirty page logging as well.
+ */
+
+ RAMBLOCK_FOREACH(block) {
+ pages += bitmap_count_one(block->bmap,
+ block->used_length >> TARGET_PAGE_BITS);
+ }
+
+ /* This may not be aligned with current bitmaps. Recalculate. */
+ rs->migration_dirty_pages = pages;
+
+ rs->last_seen_block = NULL;
+ rs->last_sent_block = NULL;
+ rs->last_page = 0;
+ rs->last_version = ram_list.version;
+ /*
+ * Disable the bulk stage, otherwise we'll resend the whole RAM no
+ * matter what we have sent.
+ */
+ rs->ram_bulk_stage = false;
+
+ /* Update RAMState cache of output QEMUFile */
+ rs->f = out;
+
+ trace_ram_state_resume_prepare(pages);
+}
+
/*
* Each of ram_save_setup, ram_save_iterate and ram_save_complete has
* long-running RCU critical section. When rcu-reclaims in the code
@@ -3486,8 +3521,16 @@ out:
static int ram_resume_prepare(MigrationState *s, void *opaque)
{
RAMState *rs = *(RAMState **)opaque;
+ int ret;
- return ram_dirty_bitmap_sync_all(s, rs);
+ ret = ram_dirty_bitmap_sync_all(s, rs);
+ if (ret) {
+ return ret;
+ }
+
+ ram_state_resume_prepare(rs, s->to_dst_file);
+
+ return 0;
}
static SaveVMHandlers savevm_ram_handlers = {
diff --git a/migration/trace-events b/migration/trace-events
index 53243e17ec..3c798ddd11 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -88,6 +88,7 @@ ram_dirty_bitmap_reload_complete(char *str) "%s"
ram_dirty_bitmap_sync_start(void) ""
ram_dirty_bitmap_sync_wait(void) ""
ram_dirty_bitmap_sync_complete(void) ""
+ram_state_resume_prepare(uint64_t v) "%" PRId64
# migration/migration.c
await_return_path_close_on_source_close(void) ""