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[Qemu-devel] [RFC v2 25/33] migration: setup ramstate for resume
From: |
Peter Xu |
Subject: |
[Qemu-devel] [RFC v2 25/33] migration: setup ramstate for resume |
Date: |
Wed, 30 Aug 2017 16:32:22 +0800 |
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.
Signed-off-by: Peter Xu <address@hidden>
---
migration/ram.c | 37 ++++++++++++++++++++++++++++++++++++-
migration/trace-events | 1 +
2 files changed, 37 insertions(+), 1 deletion(-)
diff --git a/migration/ram.c b/migration/ram.c
index afabcf5..c5d9028 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1986,6 +1986,33 @@ static int ram_state_init(RAMState **rsp)
return 0;
}
+static void ram_state_resume_prepare(RAMState *rs)
+{
+ RAMBlock *block;
+ long 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;
+
+ 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
@@ -2909,8 +2936,16 @@ 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);
+
+ return 0;
}
static SaveVMHandlers savevm_ram_handlers = {
diff --git a/migration/trace-events b/migration/trace-events
index 8962916..6e06283 100644
--- a/migration/trace-events
+++ b/migration/trace-events
@@ -85,6 +85,7 @@ ram_dirty_bitmap_sync_start(void) ""
ram_dirty_bitmap_sync_wait(void) ""
ram_dirty_bitmap_sync_notify(void) ""
ram_dirty_bitmap_sync_complete(void) ""
+ram_state_resume_prepare(long v) "%ld"
# migration/migration.c
await_return_path_close_on_source_close(void) ""
--
2.7.4
- [Qemu-devel] [RFC v2 15/33] migration: pass MigrationState to migrate_init(), (continued)
- [Qemu-devel] [RFC v2 15/33] migration: pass MigrationState to migrate_init(), Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 16/33] migration: rebuild channel on source, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 17/33] migration: new state "postcopy-recover", Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 18/33] migration: wakeup dst ram-load-thread for recover, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 19/33] migration: new cmd MIG_CMD_RECV_BITMAP, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 20/33] migration: new message MIG_RP_MSG_RECV_BITMAP, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 21/33] migration: new cmd MIG_CMD_POSTCOPY_RESUME, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 22/33] migration: new message MIG_RP_MSG_RESUME_ACK, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 23/33] migration: introduce SaveVMHandlers.resume_prepare, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 24/33] migration: synchronize dirty bitmap for resume, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 25/33] migration: setup ramstate for resume,
Peter Xu <=
- [Qemu-devel] [RFC v2 26/33] migration: final handshake for the resume, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 27/33] migration: free SocketAddress where allocated, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 28/33] migration: return incoming task tag for sockets, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 29/33] migration: return incoming task tag for exec, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 30/33] migration: return incoming task tag for fd, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 31/33] migration: store listen task tag, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 32/33] migration: allow migrate_incoming for paused VM, Peter Xu, 2017/08/30
- [Qemu-devel] [RFC v2 33/33] migration: init dst in migration_object_init too, Peter Xu, 2017/08/30