Fix kstat xuio

[zfs.git] / module / zfs / dmu.c

diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index 732742f..7f17c73 100644 (file)
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -831,6 +831,31 @@ dmu_prealloc(objset_t *os, uint64_t object, uint64_t offset, uint64_t size,
  */
 kstat_t *xuio_ksp = NULL;
 
+typedef struct xuio_stats {
+       /* loaned yet not returned arc_buf */
+       kstat_named_t xuiostat_onloan_rbuf;
+       kstat_named_t xuiostat_onloan_wbuf;
+       /* whether a copy is made when loaning out a read buffer */
+       kstat_named_t xuiostat_rbuf_copied;
+       kstat_named_t xuiostat_rbuf_nocopy;
+       /* whether a copy is made when assigning a write buffer */
+       kstat_named_t xuiostat_wbuf_copied;
+       kstat_named_t xuiostat_wbuf_nocopy;
+} xuio_stats_t;
+
+static xuio_stats_t xuio_stats = {
+       { "onloan_read_buf",    KSTAT_DATA_UINT64 },
+       { "onloan_write_buf",   KSTAT_DATA_UINT64 },
+       { "read_buf_copied",    KSTAT_DATA_UINT64 },
+       { "read_buf_nocopy",    KSTAT_DATA_UINT64 },
+       { "write_buf_copied",   KSTAT_DATA_UINT64 },
+       { "write_buf_nocopy",   KSTAT_DATA_UINT64 }
+};
+
+#define XUIOSTAT_INCR(stat, val)        \
+        atomic_add_64(&xuio_stats.stat.value.ui64, (val))
+#define XUIOSTAT_BUMP(stat)     XUIOSTAT_INCR(stat, 1)
+
 int
 dmu_xuio_init(xuio_t *xuio, int nblk)
 {