Illumos 5174 - add sdt probe for blocked read in dbuf_read()

5174 add sdt probe for blocked read in dbuf_read() Reviewed by: Basil Crow <[email protected]> Reviewed by: Matthew Ahrens <[email protected]> Reviewed by: Steven Hartland <[email protected]> Reviewed by: Richard Elling <[email protected]> Reviewed by: Boris Protopopov <[email protected]> Reviewed by: Steven Hartland <[email protected]> Reviewed by: Garrett D'Amore <[email protected]> Approved by: Robert Mustacchi <[email protected]> References: https://www.illumos.org/issues/5174 illumos/illumos-gate@f6164ad Ported by: Turbo Fredriksson <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #2710
openzfs · Sep 22, 2014 · 64dbba3 · 64dbba3
1 parent cfd3549
commit 64dbba3
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/module/zfs/dbuf.c b/module/zfs/dbuf.c
@@ -726,6 +726,8 @@ dbuf_read(dmu_buf_impl_t *db, zio_t *zio, uint32_t flags)
 			    db->db_state == DB_FILL) {
 				ASSERT(db->db_state == DB_READ ||
 				    (flags & DB_RF_HAVESTRUCT) == 0);
+				DTRACE_PROBE2(blocked__read, dmu_buf_impl_t *,
+				    db, zio_t *, zio);
 				cv_wait(&db->db_changed, &db->db_mtx);
 			}
 			if (db->db_state == DB_UNCACHED)