2 * Copyright (C) 2010-2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
4 * SPDX-License-Identifier: GPL-2.0-only
16 #include <common/common.hpp>
17 #include <common/time.hpp>
20 #include "ust-registry.hpp"
21 #include "ust-clock.hpp"
22 #include "ust-app.hpp"
24 #define NR_CLOCK_OFFSET_SAMPLES 10
26 struct offset_sample
{
27 int64_t offset
; /* correlation offset */
28 uint64_t measure_delta
; /* lower is better */
32 int _lttng_field_statedump(struct ust_registry_session
*session
,
33 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
34 size_t *iter_field
, size_t nesting
);
37 int get_count_order(unsigned int count
)
41 order
= lttng_fls(count
) - 1;
42 if (count
& (count
- 1)) {
45 LTTNG_ASSERT(order
>= 0);
50 * Returns offset where to write in metadata array, or negative error value on error.
53 ssize_t
metadata_reserve(struct ust_registry_session
*session
, size_t len
)
55 size_t new_len
= session
->metadata_len
+ len
;
56 size_t new_alloc_len
= new_len
;
57 size_t old_alloc_len
= session
->metadata_alloc_len
;
60 if (new_alloc_len
> (UINT32_MAX
>> 1))
62 if ((old_alloc_len
<< 1) > (UINT32_MAX
>> 1))
65 if (new_alloc_len
> old_alloc_len
) {
69 std::max
<size_t>(1U << get_count_order(new_alloc_len
), old_alloc_len
<< 1);
70 newptr
= (char *) realloc(session
->metadata
, new_alloc_len
);
73 session
->metadata
= newptr
;
74 /* We zero directly the memory from start of allocation. */
75 memset(&session
->metadata
[old_alloc_len
], 0, new_alloc_len
- old_alloc_len
);
76 session
->metadata_alloc_len
= new_alloc_len
;
78 ret
= session
->metadata_len
;
79 session
->metadata_len
+= len
;
84 int metadata_file_append(struct ust_registry_session
*session
,
85 const char *str
, size_t len
)
89 if (session
->metadata_fd
< 0) {
92 /* Write to metadata file */
93 written
= lttng_write(session
->metadata_fd
, str
, len
);
101 * We have exclusive access to our metadata buffer (protected by the
102 * ust_lock), so we can do racy operations such as looking for
103 * remaining space left in packet and write, since mutual exclusion
104 * protects us from concurrent writes.
106 static ATTR_FORMAT_PRINTF(2, 3)
107 int lttng_metadata_printf(struct ust_registry_session
*session
,
108 const char *fmt
, ...)
117 ret
= vasprintf(&str
, fmt
, ap
);
123 offset
= metadata_reserve(session
, len
);
128 memcpy(&session
->metadata
[offset
], str
, len
);
129 ret
= metadata_file_append(session
, str
, len
);
131 PERROR("Error appending to metadata file");
134 DBG3("Append to metadata: \"%s\"", str
);
143 int print_tabs(struct ust_registry_session
*session
, size_t nesting
)
147 for (i
= 0; i
< nesting
; i
++) {
150 ret
= lttng_metadata_printf(session
, " ");
159 void sanitize_ctf_identifier(char *out
, const char *in
)
163 for (i
= 0; i
< LTTNG_UST_ABI_SYM_NAME_LEN
; i
++) {
177 int print_escaped_ctf_string(struct ust_registry_session
*session
, const char *string
)
185 while (cur
!= '\0') {
188 ret
= lttng_metadata_printf(session
, "%s", "\\n");
192 ret
= lttng_metadata_printf(session
, "%c", '\\');
196 /* We still print the current char */
199 ret
= lttng_metadata_printf(session
, "%c", cur
);
213 /* Called with session registry mutex held. */
215 int ust_metadata_enum_statedump(struct ust_registry_session
*session
,
216 const char *enum_name
,
218 const struct lttng_ust_ctl_integer_type
*container_type
,
219 const char *field_name
, size_t *iter_field
, size_t nesting
)
221 struct ust_registry_enum
*reg_enum
;
222 const struct lttng_ust_ctl_enum_entry
*entries
;
226 char identifier
[LTTNG_UST_ABI_SYM_NAME_LEN
];
229 reg_enum
= ust_registry_lookup_enum_by_id(session
, enum_name
, enum_id
);
231 /* reg_enum can still be used because session registry mutex is held. */
236 entries
= reg_enum
->entries
;
237 nr_entries
= reg_enum
->nr_entries
;
239 ret
= print_tabs(session
, nesting
);
243 ret
= lttng_metadata_printf(session
,
244 "enum : integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u; } {\n",
245 container_type
->size
,
246 container_type
->alignment
,
247 container_type
->signedness
,
248 (container_type
->encoding
== lttng_ust_ctl_encode_none
)
250 : (container_type
->encoding
== lttng_ust_ctl_encode_UTF8
)
253 container_type
->base
);
258 /* Dump all entries */
259 for (i
= 0; i
< nr_entries
; i
++) {
260 const struct lttng_ust_ctl_enum_entry
*entry
= &entries
[i
];
263 ret
= print_tabs(session
, nesting
);
267 ret
= lttng_metadata_printf(session
,
272 len
= strlen(entry
->string
);
273 /* Escape the character '"' */
274 for (j
= 0; j
< len
; j
++) {
275 char c
= entry
->string
[j
];
279 ret
= lttng_metadata_printf(session
,
283 ret
= lttng_metadata_printf(session
,
287 ret
= lttng_metadata_printf(session
,
295 ret
= lttng_metadata_printf(session
, "\"");
300 if (entry
->u
.extra
.options
&
301 LTTNG_UST_CTL_UST_ENUM_ENTRY_OPTION_IS_AUTO
) {
302 ret
= lttng_metadata_printf(session
, ",\n");
307 ret
= lttng_metadata_printf(session
,
313 if (entry
->start
.signedness
) {
314 ret
= lttng_metadata_printf(session
,
315 "%" PRId64
, entry
->start
.value
);
317 ret
= lttng_metadata_printf(session
,
318 "%" PRIu64
, entry
->start
.value
);
324 if (entry
->start
.signedness
== entry
->end
.signedness
&&
325 entry
->start
.value
==
327 ret
= lttng_metadata_printf(session
, ",\n");
329 if (entry
->end
.signedness
) {
330 ret
= lttng_metadata_printf(session
,
331 " ... %" PRId64
",\n",
334 ret
= lttng_metadata_printf(session
,
335 " ... %" PRIu64
",\n",
345 sanitize_ctf_identifier(identifier
, field_name
);
346 ret
= print_tabs(session
, nesting
);
350 ret
= lttng_metadata_printf(session
, "} _%s;\n",
358 int _lttng_variant_statedump(struct ust_registry_session
*session
,
359 uint32_t nr_choices
, const char *tag_name
,
361 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
362 size_t *iter_field
, size_t nesting
)
364 const struct lttng_ust_ctl_field
*variant
= &fields
[*iter_field
];
367 char identifier
[LTTNG_UST_ABI_SYM_NAME_LEN
];
370 sanitize_ctf_identifier(identifier
, tag_name
);
372 ret
= print_tabs(session
, nesting
);
376 ret
= lttng_metadata_printf(session
,
377 "struct { } align(%u) _%s_padding;\n",
378 alignment
* CHAR_BIT
,
384 ret
= print_tabs(session
, nesting
);
388 ret
= lttng_metadata_printf(session
,
395 for (i
= 0; i
< nr_choices
; i
++) {
396 if (*iter_field
>= nr_fields
) {
400 ret
= _lttng_field_statedump(session
,
402 iter_field
, nesting
+ 1);
407 sanitize_ctf_identifier(identifier
, variant
->name
);
408 ret
= print_tabs(session
, nesting
);
412 ret
= lttng_metadata_printf(session
,
423 int _lttng_field_statedump(struct ust_registry_session
*session
,
424 const struct lttng_ust_ctl_field
*fields
, size_t nr_fields
,
425 size_t *iter_field
, size_t nesting
)
428 const char *bo_be
= " byte_order = be;";
429 const char *bo_le
= " byte_order = le;";
430 const char *bo_native
= "";
431 const char *bo_reverse
;
432 const struct lttng_ust_ctl_field
*field
;
434 if (*iter_field
>= nr_fields
) {
438 field
= &fields
[*iter_field
];
440 if (session
->byte_order
== BIG_ENDIAN
) {
446 switch (field
->type
.atype
) {
447 case lttng_ust_ctl_atype_integer
:
448 ret
= print_tabs(session
, nesting
);
452 ret
= lttng_metadata_printf(session
,
453 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s;\n",
454 field
->type
.u
.integer
.size
,
455 field
->type
.u
.integer
.alignment
,
456 field
->type
.u
.integer
.signedness
,
457 (field
->type
.u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
459 : (field
->type
.u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
462 field
->type
.u
.integer
.base
,
463 field
->type
.u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
467 case lttng_ust_ctl_atype_enum
:
468 ret
= ust_metadata_enum_statedump(session
,
469 field
->type
.u
.legacy
.basic
.enumeration
.name
,
470 field
->type
.u
.legacy
.basic
.enumeration
.id
,
471 &field
->type
.u
.legacy
.basic
.enumeration
.container_type
,
472 field
->name
, iter_field
, nesting
);
474 case lttng_ust_ctl_atype_float
:
475 ret
= print_tabs(session
, nesting
);
479 ret
= lttng_metadata_printf(session
,
480 "floating_point { exp_dig = %u; mant_dig = %u; align = %u;%s } _%s;\n",
481 field
->type
.u
._float
.exp_dig
,
482 field
->type
.u
._float
.mant_dig
,
483 field
->type
.u
._float
.alignment
,
484 field
->type
.u
._float
.reverse_byte_order
? bo_reverse
: bo_native
,
488 case lttng_ust_ctl_atype_array
:
490 const struct lttng_ust_ctl_basic_type
*elem_type
;
492 ret
= print_tabs(session
, nesting
);
496 elem_type
= &field
->type
.u
.legacy
.array
.elem_type
;
497 /* Only integers are currently supported in arrays. */
498 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
502 ret
= lttng_metadata_printf(session
,
503 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
504 elem_type
->u
.basic
.integer
.size
,
505 elem_type
->u
.basic
.integer
.alignment
,
506 elem_type
->u
.basic
.integer
.signedness
,
507 (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
509 : (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
512 elem_type
->u
.basic
.integer
.base
,
513 elem_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
514 field
->name
, field
->type
.u
.legacy
.array
.length
);
518 case lttng_ust_ctl_atype_array_nestable
:
520 uint32_t array_length
;
521 const struct lttng_ust_ctl_field
*array_nestable
;
522 const struct lttng_ust_ctl_type
*elem_type
;
524 array_length
= field
->type
.u
.array_nestable
.length
;
527 if (*iter_field
>= nr_fields
) {
531 array_nestable
= &fields
[*iter_field
];
532 elem_type
= &array_nestable
->type
;
534 /* Only integers are currently supported in arrays. */
535 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
540 if (field
->type
.u
.array_nestable
.alignment
) {
541 ret
= print_tabs(session
, nesting
);
545 ret
= lttng_metadata_printf(session
,
546 "struct { } align(%u) _%s_padding;\n",
547 field
->type
.u
.array_nestable
.alignment
* CHAR_BIT
,
554 ret
= print_tabs(session
, nesting
);
558 ret
= lttng_metadata_printf(session
,
559 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[%u];\n",
560 elem_type
->u
.integer
.size
,
561 elem_type
->u
.integer
.alignment
,
562 elem_type
->u
.integer
.signedness
,
563 (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
565 : (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
568 elem_type
->u
.integer
.base
,
569 elem_type
->u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
570 field
->name
, array_length
);
574 case lttng_ust_ctl_atype_sequence
:
576 const struct lttng_ust_ctl_basic_type
*elem_type
;
577 const struct lttng_ust_ctl_basic_type
*length_type
;
579 elem_type
= &field
->type
.u
.legacy
.sequence
.elem_type
;
580 length_type
= &field
->type
.u
.legacy
.sequence
.length_type
;
581 ret
= print_tabs(session
, nesting
);
586 /* Only integers are currently supported in sequences. */
587 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
592 ret
= lttng_metadata_printf(session
,
593 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } __%s_length;\n",
594 length_type
->u
.basic
.integer
.size
,
595 (unsigned int) length_type
->u
.basic
.integer
.alignment
,
596 length_type
->u
.basic
.integer
.signedness
,
597 (length_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
599 : ((length_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
602 length_type
->u
.basic
.integer
.base
,
603 length_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
609 ret
= print_tabs(session
, nesting
);
613 ret
= lttng_metadata_printf(session
,
614 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ __%s_length ];\n",
615 elem_type
->u
.basic
.integer
.size
,
616 (unsigned int) elem_type
->u
.basic
.integer
.alignment
,
617 elem_type
->u
.basic
.integer
.signedness
,
618 (elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_none
)
620 : ((elem_type
->u
.basic
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
623 elem_type
->u
.basic
.integer
.base
,
624 elem_type
->u
.basic
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
630 case lttng_ust_ctl_atype_sequence_nestable
:
632 const struct lttng_ust_ctl_field
*sequence_nestable
;
633 const struct lttng_ust_ctl_type
*elem_type
;
636 if (*iter_field
>= nr_fields
) {
640 sequence_nestable
= &fields
[*iter_field
];
641 elem_type
= &sequence_nestable
->type
;
643 /* Only integers are currently supported in sequences. */
644 if (elem_type
->atype
!= lttng_ust_ctl_atype_integer
) {
649 if (field
->type
.u
.sequence_nestable
.alignment
) {
650 ret
= print_tabs(session
, nesting
);
654 ret
= lttng_metadata_printf(session
,
655 "struct { } align(%u) _%s_padding;\n",
656 field
->type
.u
.sequence_nestable
.alignment
* CHAR_BIT
,
663 ret
= print_tabs(session
, nesting
);
667 ret
= lttng_metadata_printf(session
,
668 "integer { size = %u; align = %u; signed = %u; encoding = %s; base = %u;%s } _%s[ _%s ];\n",
669 elem_type
->u
.integer
.size
,
670 (unsigned int) elem_type
->u
.integer
.alignment
,
671 elem_type
->u
.integer
.signedness
,
672 (elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_none
)
674 : ((elem_type
->u
.integer
.encoding
== lttng_ust_ctl_encode_UTF8
)
677 elem_type
->u
.integer
.base
,
678 elem_type
->u
.integer
.reverse_byte_order
? bo_reverse
: bo_native
,
680 field
->type
.u
.sequence_nestable
.length_name
);
684 case lttng_ust_ctl_atype_string
:
685 /* Default encoding is UTF8 */
686 ret
= print_tabs(session
, nesting
);
690 ret
= lttng_metadata_printf(session
,
692 field
->type
.u
.string
.encoding
== lttng_ust_ctl_encode_ASCII
?
693 " { encoding = ASCII; }" : "",
697 case lttng_ust_ctl_atype_variant
:
698 ret
= _lttng_variant_statedump(session
,
699 field
->type
.u
.legacy
.variant
.nr_choices
,
700 field
->type
.u
.legacy
.variant
.tag_name
,
702 fields
, nr_fields
, iter_field
, nesting
);
707 case lttng_ust_ctl_atype_variant_nestable
:
708 ret
= _lttng_variant_statedump(session
,
709 field
->type
.u
.variant_nestable
.nr_choices
,
710 field
->type
.u
.variant_nestable
.tag_name
,
711 field
->type
.u
.variant_nestable
.alignment
,
712 fields
, nr_fields
, iter_field
, nesting
);
717 case lttng_ust_ctl_atype_struct
:
718 if (field
->type
.u
.legacy
._struct
.nr_fields
!= 0) {
719 /* Currently only 0-length structures are supported. */
723 ret
= print_tabs(session
, nesting
);
727 ret
= lttng_metadata_printf(session
,
732 case lttng_ust_ctl_atype_struct_nestable
:
733 if (field
->type
.u
.struct_nestable
.nr_fields
!= 0) {
734 /* Currently only 0-length structures are supported. */
738 ret
= print_tabs(session
, nesting
);
742 if (field
->type
.u
.struct_nestable
.alignment
) {
743 ret
= lttng_metadata_printf(session
,
744 "struct {} align(%u) _%s;\n",
745 field
->type
.u
.struct_nestable
.alignment
* CHAR_BIT
,
751 ret
= lttng_metadata_printf(session
,
757 case lttng_ust_ctl_atype_enum_nestable
:
759 const struct lttng_ust_ctl_field
*container_field
;
760 const struct lttng_ust_ctl_type
*container_type
;
763 if (*iter_field
>= nr_fields
) {
767 container_field
= &fields
[*iter_field
];
768 container_type
= &container_field
->type
;
770 /* Only integers are supported as container types. */
771 if (container_type
->atype
!= lttng_ust_ctl_atype_integer
) {
775 ret
= ust_metadata_enum_statedump(session
,
776 field
->type
.u
.enum_nestable
.name
,
777 field
->type
.u
.enum_nestable
.id
,
778 &container_type
->u
.integer
,
779 field
->name
, iter_field
, nesting
);
790 int _lttng_context_metadata_statedump(struct ust_registry_session
*session
,
791 size_t nr_ctx_fields
,
792 struct lttng_ust_ctl_field
*ctx
)
800 if (i
>= nr_ctx_fields
) {
803 ret
= _lttng_field_statedump(session
, ctx
,
804 nr_ctx_fields
, &i
, 2);
813 int _lttng_fields_metadata_statedump(struct ust_registry_session
*session
,
814 struct ust_registry_event
*event
)
820 if (i
>= event
->nr_fields
) {
823 ret
= _lttng_field_statedump(session
, event
->fields
,
824 event
->nr_fields
, &i
, 2);
833 * Should be called with session registry mutex held.
835 int ust_metadata_event_statedump(struct ust_registry_session
*session
,
836 struct ust_registry_channel
*chan
,
837 struct ust_registry_event
*event
)
841 /* Don't dump metadata events */
842 if (chan
->chan_id
== -1U)
846 * We don't want to output an event's metadata before its parent
847 * stream's metadata. If the stream's metadata hasn't been output yet,
848 * skip this event. Its metadata will be output when we output the
851 if (!chan
->metadata_dumped
|| event
->metadata_dumped
) {
855 ret
= lttng_metadata_printf(session
,
859 " stream_id = %u;\n",
867 ret
= lttng_metadata_printf(session
,
869 event
->loglevel_value
);
874 if (event
->model_emf_uri
) {
875 ret
= lttng_metadata_printf(session
,
876 " model.emf.uri = \"%s\";\n",
877 event
->model_emf_uri
);
883 ret
= lttng_metadata_printf(session
,
884 " fields := struct {\n"
890 ret
= _lttng_fields_metadata_statedump(session
, event
);
895 ret
= lttng_metadata_printf(session
,
901 event
->metadata_dumped
= 1;
908 * Should be called with session registry mutex held.
910 int ust_metadata_channel_statedump(struct ust_registry_session
*session
,
911 struct ust_registry_channel
*chan
)
915 /* Don't dump metadata events */
916 if (chan
->chan_id
== -1U)
919 if (!chan
->header_type
)
922 ret
= lttng_metadata_printf(session
,
925 " event.header := %s;\n"
926 " packet.context := struct packet_context;\n",
928 chan
->header_type
== LTTNG_UST_CTL_CHANNEL_HEADER_COMPACT
?
929 "struct event_header_compact" :
930 "struct event_header_large");
935 if (chan
->ctx_fields
) {
936 ret
= lttng_metadata_printf(session
,
937 " event.context := struct {\n");
942 ret
= _lttng_context_metadata_statedump(session
,
948 if (chan
->ctx_fields
) {
949 ret
= lttng_metadata_printf(session
,
956 ret
= lttng_metadata_printf(session
,
962 /* Flag success of metadata dump. */
963 chan
->metadata_dumped
= 1;
966 * Output the metadata of any existing event.
968 * Sort the events by id. This is not necessary, but it's nice to have
969 * a more predictable order in the metadata file.
971 std::vector
<ust_registry_event
*> events
;
973 cds_lfht_iter event_iter
;
974 ust_registry_event
*event
;
975 cds_lfht_for_each_entry(chan
->events
->ht
, &event_iter
, event
,
977 events
.push_back(event
);
981 std::sort(events
.begin(), events
.end(),
982 [] (ust_registry_event
*a
, ust_registry_event
*b
) {
983 return a
->id
< b
->id
;
986 for (ust_registry_event
*event
: events
) {
987 ust_metadata_event_statedump(session
, chan
, event
);
994 int _lttng_stream_packet_context_declare(struct ust_registry_session
*session
)
996 return lttng_metadata_printf(session
,
997 "struct packet_context {\n"
998 " uint64_clock_monotonic_t timestamp_begin;\n"
999 " uint64_clock_monotonic_t timestamp_end;\n"
1000 " uint64_t content_size;\n"
1001 " uint64_t packet_size;\n"
1002 " uint64_t packet_seq_num;\n"
1003 " unsigned long events_discarded;\n"
1004 " uint32_t cpu_id;\n"
1011 * id: range: 0 - 30.
1012 * id 31 is reserved to indicate an extended header.
1015 * id: range: 0 - 65534.
1016 * id 65535 is reserved to indicate an extended header.
1019 int _lttng_event_header_declare(struct ust_registry_session
*session
)
1021 return lttng_metadata_printf(session
,
1022 "struct event_header_compact {\n"
1023 " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n"
1026 " uint27_clock_monotonic_t timestamp;\n"
1030 " uint64_clock_monotonic_t timestamp;\n"
1035 "struct event_header_large {\n"
1036 " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n"
1039 " uint32_clock_monotonic_t timestamp;\n"
1043 " uint64_clock_monotonic_t timestamp;\n"
1047 session
->uint32_t_alignment
,
1048 session
->uint16_t_alignment
1053 * The offset between monotonic and realtime clock can be negative if
1054 * the system sets the REALTIME clock to 0 after boot.
1057 int measure_single_clock_offset(struct offset_sample
*sample
)
1059 uint64_t monotonic_avg
, monotonic
[2], measure_delta
, realtime
;
1060 uint64_t tcf
= trace_clock_freq();
1061 struct timespec rts
= { 0, 0 };
1064 monotonic
[0] = trace_clock_read64();
1065 ret
= lttng_clock_gettime(CLOCK_REALTIME
, &rts
);
1069 monotonic
[1] = trace_clock_read64();
1070 measure_delta
= monotonic
[1] - monotonic
[0];
1071 if (measure_delta
> sample
->measure_delta
) {
1073 * Discard value if it took longer to read than the best
1078 monotonic_avg
= (monotonic
[0] + monotonic
[1]) >> 1;
1079 realtime
= (uint64_t) rts
.tv_sec
* tcf
;
1080 if (tcf
== NSEC_PER_SEC
) {
1081 realtime
+= rts
.tv_nsec
;
1083 realtime
+= (uint64_t) rts
.tv_nsec
* tcf
/ NSEC_PER_SEC
;
1085 sample
->offset
= (int64_t) realtime
- monotonic_avg
;
1086 sample
->measure_delta
= measure_delta
;
1091 * Approximation of NTP time of day to clock monotonic correlation,
1092 * taken at start of trace. Keep the measurement that took the less time
1093 * to complete, thus removing imprecision caused by preemption.
1094 * May return a negative offset.
1097 int64_t measure_clock_offset(void)
1100 struct offset_sample offset_best_sample
= {
1102 .measure_delta
= UINT64_MAX
,
1105 for (i
= 0; i
< NR_CLOCK_OFFSET_SAMPLES
; i
++) {
1106 if (measure_single_clock_offset(&offset_best_sample
)) {
1110 return offset_best_sample
.offset
;
1114 int print_metadata_session_information(struct ust_registry_session
*registry
)
1117 struct ltt_session
*session
= NULL
;
1118 char creation_datetime
[ISO8601_STR_LEN
];
1121 session
= session_find_by_id(registry
->tracing_id
);
1127 /* Print the trace name */
1128 ret
= lttng_metadata_printf(registry
, " trace_name = \"");
1134 * This is necessary since the creation time is present in the session
1135 * name when it is generated.
1137 if (session
->has_auto_generated_name
) {
1138 ret
= print_escaped_ctf_string(registry
, DEFAULT_SESSION_NAME
);
1140 ret
= print_escaped_ctf_string(registry
, session
->name
);
1146 ret
= lttng_metadata_printf(registry
, "\";\n");
1151 /* Prepare creation time */
1152 ret
= time_to_iso8601_str(session
->creation_time
, creation_datetime
,
1153 sizeof(creation_datetime
));
1158 /* Output the reste of the information */
1159 ret
= lttng_metadata_printf(registry
,
1160 " trace_creation_datetime = \"%s\";\n"
1161 " hostname = \"%s\";\n",
1162 creation_datetime
, session
->hostname
);
1169 session_put(session
);
1176 int print_metadata_app_information(struct ust_registry_session
*registry
,
1177 struct ust_app
*app
)
1180 char datetime
[ISO8601_STR_LEN
];
1187 ret
= time_to_iso8601_str(
1188 app
->registration_time
, datetime
, sizeof(datetime
));
1193 ret
= lttng_metadata_printf(registry
,
1194 " tracer_patchlevel = %u;\n"
1196 " procname = \"%s\";\n"
1197 " vpid_datetime = \"%s\";\n",
1198 app
->version
.patchlevel
, (int) app
->pid
, app
->name
,
1206 * Should be called with session registry mutex held.
1208 int ust_metadata_session_statedump(struct ust_registry_session
*session
,
1209 struct ust_app
*app
,
1213 char uuid_s
[LTTNG_UUID_STR_LEN
],
1214 clock_uuid_s
[LTTNG_UUID_STR_LEN
];
1217 LTTNG_ASSERT(session
);
1219 lttng_uuid_to_str(session
->uuid
, uuid_s
);
1222 ret
= lttng_metadata_printf(session
,
1223 "/* CTF %u.%u */\n\n",
1230 ret
= lttng_metadata_printf(session
,
1231 "typealias integer { size = 8; align = %u; signed = false; } := uint8_t;\n"
1232 "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n"
1233 "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n"
1234 "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n"
1235 "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n"
1236 "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n"
1237 "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n"
1243 " byte_order = %s;\n"
1244 " packet.header := struct {\n"
1245 " uint32_t magic;\n"
1246 " uint8_t uuid[16];\n"
1247 " uint32_t stream_id;\n"
1248 " uint64_t stream_instance_id;\n"
1251 session
->uint8_t_alignment
,
1252 session
->uint16_t_alignment
,
1253 session
->uint32_t_alignment
,
1254 session
->uint64_t_alignment
,
1255 session
->bits_per_long
,
1256 session
->long_alignment
,
1260 session
->byte_order
== BIG_ENDIAN
? "be" : "le"
1266 ret
= lttng_metadata_printf(session
,
1268 " domain = \"ust\";\n"
1269 " tracer_name = \"lttng-ust\";\n"
1270 " tracer_major = %u;\n"
1271 " tracer_minor = %u;\n"
1272 " tracer_buffering_scheme = \"%s\";\n"
1273 " tracer_buffering_id = %u;\n"
1274 " architecture_bit_width = %u;\n",
1277 app
? "pid" : "uid",
1278 app
? (int) app
->pid
: (int) session
->tracing_uid
,
1279 session
->bits_per_long
);
1284 ret
= print_metadata_session_information(session
);
1290 * If per-application registry, we can output extra information
1291 * about the application.
1293 ret
= print_metadata_app_information(session
, app
);
1298 ret
= lttng_metadata_printf(session
,
1305 ret
= lttng_metadata_printf(session
,
1307 " name = \"%s\";\n",
1314 if (!trace_clock_uuid(clock_uuid_s
)) {
1315 ret
= lttng_metadata_printf(session
,
1316 " uuid = \"%s\";\n",
1324 ret
= lttng_metadata_printf(session
,
1325 " description = \"%s\";\n"
1326 " freq = %" PRIu64
"; /* Frequency, in Hz */\n"
1327 " /* clock value offset from Epoch is: offset * (1/freq) */\n"
1328 " offset = %" PRId64
";\n"
1330 trace_clock_description(),
1332 measure_clock_offset()
1338 ret
= lttng_metadata_printf(session
,
1339 "typealias integer {\n"
1340 " size = 27; align = 1; signed = false;\n"
1341 " map = clock.%s.value;\n"
1342 "} := uint27_clock_monotonic_t;\n"
1344 "typealias integer {\n"
1345 " size = 32; align = %u; signed = false;\n"
1346 " map = clock.%s.value;\n"
1347 "} := uint32_clock_monotonic_t;\n"
1349 "typealias integer {\n"
1350 " size = 64; align = %u; signed = false;\n"
1351 " map = clock.%s.value;\n"
1352 "} := uint64_clock_monotonic_t;\n\n",
1354 session
->uint32_t_alignment
,
1356 session
->uint64_t_alignment
,
1363 ret
= _lttng_stream_packet_context_declare(session
);
1368 ret
= _lttng_event_header_declare(session
);