[Qemu-devel] [PATCH v3 4/7] hmp interface for dirty bitmap dump

[Sanidhya Kashyap <sanidhya.iiith@gmail.com>]

Signed-off-by: Sanidhya Kashyap <sanidhya.iiith@gmail.com>
---
 hmp-commands.hx | 16 ++++++++++++++++
 hmp.c           | 16 ++++++++++++++++
 hmp.h           |  1 +
 3 files changed, 33 insertions(+)

diff --git a/hmp-commands.hx b/hmp-commands.hx
index 5f1a677..cccd53e 100644
--- a/hmp-commands.hx
+++ b/hmp-commands.hx
@@ -1788,6 +1788,22 @@ STEXI
 show available trace events and their state
 ETEXI
 
+     {
+        .name       = "ldb|log-dirty-bitmap",
+        .args_type  = "filename:s,epochs:i?,frequency:i?",
+        .params     = "filename epochs frequency",
+        .help       = "dumps the memory's dirty bitmap to file\n\t\t\t"
+                     "filename: name of the file in which the bitmap will be saved\n\t\t\t"
+                      "epochs: number of times, the memory will be logged\n\t\t\t"
+                      "frequency: time difference in milliseconds between each epoch",
+        .mhandler.cmd = hmp_log_dirty_bitmap,
+    },
+STEXI
+@item ldb or log-dirty-bitmap @var{filename}
+@findex log-dirty-bitmap
+dumps the writable working set of a VM's memory to a file
+ETEXI
+
 STEXI
 @end table
 ETEXI
diff --git a/hmp.c b/hmp.c
index ccc35d4..a400825 100644
--- a/hmp.c
+++ b/hmp.c
@@ -1314,6 +1314,22 @@ void hmp_device_del(Monitor *mon, const QDict *qdict)
     hmp_handle_error(mon, &err);
 }
 
+void hmp_log_dirty_bitmap(Monitor *mon, const QDict *qdict)
+{
+    const char *filename = qdict_get_str(qdict, "filename");
+    int64_t epochs = qdict_get_try_int(qdict, "epochs", 3);
+    int64_t frequency = qdict_get_try_int(qdict, "frequency", 10);
+    Error *err = NULL;
+
+    qmp_log_dirty_bitmap(filename, !!epochs, epochs, !!frequency,
+                         frequency, &err);
+    if (err) {
+        monitor_printf(mon, "log-dirty-bitmap: %s\n", error_get_pretty(err));
+        error_free(err);
+        return;
+    }
+}
+
 void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict)
 {
     Error *err = NULL;
diff --git a/hmp.h b/hmp.h
index 2d9b0a2..fbb08c5 100644
--- a/hmp.h
+++ b/hmp.h
@@ -93,6 +93,7 @@ void hmp_qemu_io(Monitor *mon, const QDict *qdict);
 void hmp_cpu_add(Monitor *mon, const QDict *qdict);
 void hmp_object_add(Monitor *mon, const QDict *qdict);
 void hmp_object_del(Monitor *mon, const QDict *qdict);
+void hmp_log_dirty_bitmap(Monitor *mon, const QDict *qdict);
 void object_add_completion(ReadLineState *rs, int nb_args, const char *str);
 void object_del_completion(ReadLineState *rs, int nb_args, const char *str);
 void device_add_completion(ReadLineState *rs, int nb_args, const char *str);
-- 
1.9.3