OpenZFS 6531 - Provide mechanism to artificially limit disk performance

Reviewed by: Paul Dagnelie <[email protected]>
Reviewed by: Matthew Ahrens <[email protected]>
Reviewed by: George Wilson <[email protected]>
Approved by: Dan McDonald <[email protected]>
Ported by: Tony Hutter <[email protected]>
Signed-off-by: Brian Behlendorf <[email protected]>

OpenZFS-issue: https://www.illumos.org/issues/6531
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/97e8130

Porting notes:
- Added new IO delay tracepoints, and moved common ZIO tracepoint macros
  to a new trace_common.h file.
- Used zio_delay_taskq() in place of OpenZFS's timeout_generic() function.
- Updated zinject man page
- Updated zpool_scrub test files

1 files changed, 87 insertions, 0 deletions

diff --git a/include/sys/trace_zio.h b/include/sys/trace_zio.h
new file mode 100644
index 000000000..6db6cefe2
--- /dev/null
+++ b/include/sys/trace_zio.h
@@ -0,0 +1,87 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+
+#include <sys/list.h>
+
+#if defined(_KERNEL) && defined(HAVE_DECLARE_EVENT_CLASS)
+
+#undef TRACE_SYSTEM
+#define	TRACE_SYSTEM zfs
+
+#undef TRACE_SYSTEM_VAR
+#define	TRACE_SYSTEM_VAR zfs_zio
+
+#if !defined(_TRACE_ZIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define	_TRACE_ZIO_H
+
+#include <linux/tracepoint.h>
+#include <sys/types.h>
+#include <sys/trace_common.h> /* For ZIO macros */
+
+TRACE_EVENT(zfs_zio__delay__miss,
+	TP_PROTO(zio_t *zio, hrtime_t now),
+	TP_ARGS(zio, now),
+	TP_STRUCT__entry(
+	    ZIO_TP_STRUCT_ENTRY
+	    __field(hrtime_t, now)
+	),
+	TP_fast_assign(
+	    ZIO_TP_FAST_ASSIGN
+	    __entry->now = now;
+	),
+	TP_printk("now %llu " ZIO_TP_PRINTK_FMT, __entry->now,
+	    ZIO_TP_PRINTK_ARGS)
+);
+
+TRACE_EVENT(zfs_zio__delay__hit,
+	TP_PROTO(zio_t *zio, hrtime_t now, hrtime_t diff),
+	TP_ARGS(zio, now, diff),
+	TP_STRUCT__entry(
+	    ZIO_TP_STRUCT_ENTRY
+	    __field(hrtime_t, now)
+	    __field(hrtime_t, diff)
+	),
+	TP_fast_assign(
+	    ZIO_TP_FAST_ASSIGN
+	    __entry->now = now;
+	    __entry->diff = diff;
+	),
+	TP_printk("now %llu diff %llu " ZIO_TP_PRINTK_FMT, __entry->now,
+	    __entry->diff, ZIO_TP_PRINTK_ARGS)
+);
+
+TRACE_EVENT(zfs_zio__delay__skip,
+	TP_PROTO(zio_t *zio),
+	TP_ARGS(zio),
+	TP_STRUCT__entry(ZIO_TP_STRUCT_ENTRY),
+	TP_fast_assign(ZIO_TP_FAST_ASSIGN),
+	TP_printk(ZIO_TP_PRINTK_FMT, ZIO_TP_PRINTK_ARGS)
+);
+
+#endif /* _TRACE_ZIO_H */
+
+#undef TRACE_INCLUDE_PATH
+#undef TRACE_INCLUDE_FILE
+#define	TRACE_INCLUDE_PATH sys
+#define	TRACE_INCLUDE_FILE trace_zio
+#include <trace/define_trace.h>
+
+#endif /* _KERNEL && HAVE_DECLARE_EVENT_CLASS */