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| author | Peter Xu <peterx@redhat.com> | 2018-05-02 18:47:33 +0800 |
|---|---|---|
| committer | Juan Quintela <quintela@redhat.com> | 2018-05-15 20:56:59 +0200 |
| commit | 08614f34977a18fdc06c56f4e12b6cf47c06da57 (patch) | |
| tree | f9adcef1f7fa7bbfeddeb4708e82818474f7a90e | |
| parent | edd090c72825b483df4de6a525d430d7635a5d8e (diff) | |
| download | qemu-08614f34977a18fdc06c56f4e12b6cf47c06da57.zip qemu-08614f34977a18fdc06c56f4e12b6cf47c06da57.tar.gz qemu-08614f34977a18fdc06c56f4e12b6cf47c06da57.tar.bz2 | |
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.c | 45 | ||||
| -rw-r--r-- | migration/trace-events | 1 |
2 files changed, 45 insertions, 1 deletions
diff --git a/migration/ram.c b/migration/ram.c index b16eabc..5bcbf7a 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 53243e1..3c798dd 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) "" |