[PATCH v3 01/10] migration/dirtyrate: Add get_dirtyrate_thread() function

[Chuan Zheng <zhengchuan@huawei.com>]

Add get_dirtyrate_thread() functions

Signed-off-by: Chuan Zheng <zhengchuan@huawei.com>
Signed-off-by: YanYing Zhuang <ann.zhuangyanying@huawei.com>
---
 migration/Makefile.objs |  1 +
 migration/dirtyrate.c   | 64 +++++++++++++++++++++++++++++++++++++++++++++++++
 migration/dirtyrate.h   | 44 ++++++++++++++++++++++++++++++++++
 3 files changed, 109 insertions(+)
 create mode 100644 migration/dirtyrate.c
 create mode 100644 migration/dirtyrate.h

diff --git a/migration/Makefile.objs b/migration/Makefile.objs
index 0fc619e..12ae98c 100644
--- a/migration/Makefile.objs
+++ b/migration/Makefile.objs
@@ -6,6 +6,7 @@ common-obj-y += qemu-file.o global_state.o
 common-obj-y += qemu-file-channel.o
 common-obj-y += xbzrle.o postcopy-ram.o
 common-obj-y += qjson.o
+common-obj-y += dirtyrate.o
 common-obj-y += block-dirty-bitmap.o
 common-obj-y += multifd.o
 common-obj-y += multifd-zlib.o
diff --git a/migration/dirtyrate.c b/migration/dirtyrate.c
new file mode 100644
index 0000000..bb0ebe9
--- /dev/null
+++ b/migration/dirtyrate.c
@@ -0,0 +1,64 @@
+/*
+ * Dirtyrate implement code
+ *
+ * Copyright (c) 2017-2020 HUAWEI TECHNOLOGIES CO.,LTD.
+ *
+ * Authors:
+ *  Chuan Zheng <zhengchuan@huawei.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "crypto/hash.h"
+#include "crypto/random.h"
+#include "qemu/config-file.h"
+#include "exec/memory.h"
+#include "exec/ramblock.h"
+#include "exec/target_page.h"
+#include "qemu/rcu_queue.h"
+#include "qapi/qapi-commands-migration.h"
+#include "migration.h"
+#include "dirtyrate.h"
+
+CalculatingDirtyRateState CalculatingState = CAL_DIRTY_RATE_INIT;
+
+static int dirty_rate_set_state(int new_state)
+{
+    int old_state = CalculatingState;
+
+    if (new_state == old_state) {
+        return -1;
+    }
+
+    if (atomic_cmpxchg(&CalculatingState, old_state, new_state) != old_state) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static void calculate_dirtyrate(struct DirtyRateConfig config)
+{
+    /* todo */
+    return;
+}
+
+void *get_dirtyrate_thread(void *arg)
+{
+    struct DirtyRateConfig config = *(struct DirtyRateConfig *)arg;
+    int ret;
+
+    ret = dirty_rate_set_state(CAL_DIRTY_RATE_ACTIVE);
+    if (ret == -1) {
+        return NULL;
+    }
+
+    calculate_dirtyrate(config);
+
+    ret = dirty_rate_set_state(CAL_DIRTY_RATE_END);
+
+    return NULL;
+}
diff --git a/migration/dirtyrate.h b/migration/dirtyrate.h
new file mode 100644
index 0000000..914c363
--- /dev/null
+++ b/migration/dirtyrate.h
@@ -0,0 +1,44 @@
+/*
+ *  Dirtyrate common functions
+ *
+ *  Copyright (c) 2020 HUAWEI TECHNOLOGIES CO., LTD.
+ *
+ *  Authors:
+ *  Chuan Zheng <zhengchuan@huawei.com>
+ *
+ *  This work is licensed under the terms of the GNU GPL, version 2 or later.
+ *  See the COPYING file in the top-level directory.
+ */
+
+#ifndef QEMU_MIGRATION_DIRTYRATE_H
+#define QEMU_MIGRATION_DIRTYRATE_H
+
+/*
+ * Sample 256 pages per GB as default.
+ * TODO: Make it configurable.
+ */
+#define DIRTYRATE_DEFAULT_SAMPLE_PAGES            256
+
+/* Take 1s as default for calculation duration */
+#define DEFAULT_FETCH_DIRTYRATE_TIME_SEC          1
+
+struct DirtyRateConfig {
+    uint64_t sample_pages_per_gigabytes; /* sample pages per GB */
+    int64_t sample_period_seconds; /* time duration between two sampling */
+};
+
+/*
+ *  To record calculate dirty_rate status:
+ *  0: initial status, calculating thread is not be created here.
+ *  1: calculating thread is created.
+ *  2: calculating thread is end, we can get result.
+ */
+typedef enum {
+    CAL_DIRTY_RATE_INIT = 0,
+    CAL_DIRTY_RATE_ACTIVE,
+    CAL_DIRTY_RATE_END,
+} CalculatingDirtyRateState;
+
+void *get_dirtyrate_thread(void *arg);
+#endif
+
-- 
1.8.3.1