[Qemu-devel] [PATCH 1/3] block: include flush requests in info blockstats

[Christoph Hellwig <hch@lst.de>]

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: qemu/block.c
===================================================================
--- qemu.orig/block.c	2011-08-11 12:32:35.842658196 +0200
+++ qemu/block.c	2011-08-11 16:04:48.302061893 +0200
@@ -1888,11 +1888,13 @@ static void bdrv_stats_iter(QObject *dat
                         " wr_bytes=%" PRId64
                         " rd_operations=%" PRId64
                         " wr_operations=%" PRId64
+                        " flush_operations=%" PRId64
                         "\n",
                         qdict_get_int(qdict, "rd_bytes"),
                         qdict_get_int(qdict, "wr_bytes"),
                         qdict_get_int(qdict, "rd_operations"),
-                        qdict_get_int(qdict, "wr_operations"));
+                        qdict_get_int(qdict, "wr_operations"),
+                        qdict_get_int(qdict, "flush_operations"));
 }
 
 void bdrv_stats_print(Monitor *mon, const QObject *data)
@@ -1910,12 +1912,16 @@ static QObject* bdrv_info_stats_bs(Block
                              "'wr_bytes': %" PRId64 ","
                              "'rd_operations': %" PRId64 ","
                              "'wr_operations': %" PRId64 ","
-                             "'wr_highest_offset': %" PRId64
+                             "'wr_highest_offset': %" PRId64 ","
+                             "'flush_operations': %" PRId64
                              "} }",
-                             bs->rd_bytes, bs->wr_bytes,
-                             bs->rd_ops, bs->wr_ops,
+                             bs->rd_bytes,
+                             bs->wr_bytes,
+                             bs->rd_ops,
+                             bs->wr_ops,
                              bs->wr_highest_sector *
-                             (uint64_t)BDRV_SECTOR_SIZE);
+                             (uint64_t)BDRV_SECTOR_SIZE,
+                             bs->flush_ops);
     dict  = qobject_to_qdict(res);
 
     if (*bs->device_name) {
@@ -2579,6 +2585,8 @@ BlockDriverAIOCB *bdrv_aio_flush(BlockDr
 
     trace_bdrv_aio_flush(bs, opaque);
 
+    bs->flush_ops++;
+
     if (bs->open_flags & BDRV_O_NO_FLUSH) {
         return bdrv_aio_noop_em(bs, cb, opaque);
     }
Index: qemu/block_int.h
===================================================================
--- qemu.orig/block_int.h	2011-08-11 12:32:35.852658142 +0200
+++ qemu/block_int.h	2011-08-11 16:04:48.302061893 +0200
@@ -188,6 +188,7 @@ struct BlockDriverState {
     uint64_t wr_bytes;
     uint64_t rd_ops;
     uint64_t wr_ops;
+    uint64_t flush_ops;
     uint64_t wr_highest_sector;
 
     /* Whether the disk can expand beyond total_sectors */
Index: qemu/qmp-commands.hx
===================================================================
--- qemu.orig/qmp-commands.hx	2011-08-11 12:32:36.062657004 +0200
+++ qemu/qmp-commands.hx	2011-08-11 16:04:48.305395208 +0200
@@ -1201,6 +1201,7 @@ Each json-object contain the following:
     - "wr_bytes": bytes written (json-int)
     - "rd_operations": read operations (json-int)
     - "wr_operations": write operations (json-int)
+    - "flush_operations": cache flush operations (json-int)
     - "wr_highest_offset": Highest offset of a sector written since the
                            BlockDriverState has been opened (json-int)
 - "parent": Contains recursively the statistics of the underlying
@@ -1222,6 +1223,7 @@ Example:
                   "wr_operations":751,
                   "rd_bytes":122567168,
                   "rd_operations":36772
+                  "flush_operations":61,
                }
             },
             "stats":{
@@ -1230,6 +1232,7 @@ Example:
                "wr_operations":692,
                "rd_bytes":122739200,
                "rd_operations":36604
+               "flush_operations":51,
             }
          },
          {
@@ -1240,6 +1243,7 @@ Example:
                "wr_operations":0,
                "rd_bytes":0,
                "rd_operations":0
+               "flush_operations":0,
             }
          },
          {
@@ -1250,6 +1254,7 @@ Example:
                "wr_operations":0,
                "rd_bytes":0,
                "rd_operations":0
+               "flush_operations":0,
             }
          },
          {
@@ -1260,6 +1265,7 @@ Example:
                "wr_operations":0,
                "rd_bytes":0,
                "rd_operations":0
+               "flush_operations":0,
             }
          }
       ]