X-Git-Url: https://git.camperquake.de/gitweb.cgi?a=blobdiff_plain;f=module%2Fzfs%2Fdmu.c;h=7f17c736fd0030c35978e7431b4fa62d7e9514fa;hb=18a89ba43d3e5e8a31d50838c93ec26d1cb27429;hp=f2b3f2ba7f27d6d03cdb29d89075959aeeff489c;hpb=d6320ddb78fa89c4d0fc2af00ae53c7c70992f96;p=zfs.git

diff --git a/module/zfs/dmu.c b/module/zfs/dmu.c
index f2b3f2b..7f17c73 100644
--- a/module/zfs/dmu.c
+++ b/module/zfs/dmu.c
@@ -355,7 +355,7 @@ dmu_buf_hold_array_by_dnode(dnode_t *dn, uint64_t offset, uint64_t length,
 	uint32_t dbuf_flags;
 	int err;
 	zio_t *zio;
-	hrtime_t start;
+	hrtime_t start = 0;
 
 	ASSERT(length <= DMU_MAX_ACCESS);
 
@@ -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)
 {