X-Git-Url: http://git.liburcu.org/?a=blobdiff_plain;f=lttng-events.c;h=246540e2f730222a831ed0cc82c6a4784020d8a0;hb=refs%2Fheads%2Fstable-2.2;hp=0ef87a8c992a9224b613b218ac1e324b95440a43;hpb=a90917c3f8c4ed79117f1caa333b29a2108084ec;p=lttng-modules.git diff --git a/lttng-events.c b/lttng-events.c index 0ef87a8c..246540e2 100644 --- a/lttng-events.c +++ b/lttng-events.c @@ -1,11 +1,23 @@ /* * lttng-events.c * - * Copyright 2010-2011 (c) - Mathieu Desnoyers - * * Holds LTTng per-session event registry. * - * Dual LGPL v2.1/GPL v2 license. + * Copyright (C) 2010-2012 Mathieu Desnoyers + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; only + * version 2.1 of the License. + * + * This library is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with this library; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #include @@ -14,10 +26,15 @@ #include #include #include +#include #include "wrapper/uuid.h" #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ +#include "wrapper/random.h" +#include "wrapper/tracepoint.h" +#include "lttng-kernel-version.h" #include "lttng-events.h" #include "lttng-tracer.h" +#include "lttng-abi-old.h" static LIST_HEAD(sessions); static LIST_HEAD(lttng_transport_list); @@ -37,9 +54,15 @@ int _lttng_session_metadata_statedump(struct lttng_session *session); void synchronize_trace(void) { synchronize_sched(); +#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) +#ifdef CONFIG_PREEMPT_RT_FULL + synchronize_rcu(); +#endif +#else /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ #ifdef CONFIG_PREEMPT_RT synchronize_rcu(); #endif +#endif /* (LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,0)) */ } struct lttng_session *lttng_session_create(void) @@ -111,6 +134,11 @@ int lttng_session_enable(struct lttng_session *session) ACCESS_ONCE(session->active) = 1; ACCESS_ONCE(session->been_active) = 1; ret = _lttng_session_metadata_statedump(session); + if (ret) { + ACCESS_ONCE(session->active) = 0; + goto end; + } + ret = lttng_statedump_start(session); if (ret) ACCESS_ONCE(session->active) = 0; end: @@ -225,9 +253,9 @@ struct lttng_channel *lttng_channel_create(struct lttng_session *session, * headers. Therefore the "chan" information used as input * should be already accessible. */ - chan->chan = transport->ops.channel_create("[lttng]", chan, buf_addr, - subbuf_size, num_subbuf, switch_timer_interval, - read_timer_interval); + chan->chan = transport->ops.channel_create(transport_name, + chan, buf_addr, subbuf_size, num_subbuf, + switch_timer_interval, read_timer_interval); if (!chan->chan) goto create_error; chan->enabled = 1; @@ -273,7 +301,7 @@ struct lttng_event *lttng_event_create(struct lttng_channel *chan, int ret; mutex_lock(&sessions_mutex); - if (chan->free_event_id == -1UL) + if (chan->free_event_id == -1U) goto full; /* * This is O(n^2) (for each event, the loop is called at event @@ -297,7 +325,7 @@ struct lttng_event *lttng_event_create(struct lttng_channel *chan, event->desc = lttng_event_get(event_param->name); if (!event->desc) goto register_error; - ret = tracepoint_probe_register(event_param->name, + ret = kabi_2635_tracepoint_probe_register(event->desc->kname, event->desc->probe_callback, event); if (ret) @@ -373,6 +401,7 @@ struct lttng_event *lttng_event_create(struct lttng_channel *chan, break; default: WARN_ON_ONCE(1); + goto register_error; } ret = _lttng_event_metadata_statedump(chan->session, chan, event); if (ret) @@ -401,7 +430,7 @@ int _lttng_event_unregister(struct lttng_event *event) switch (event->instrumentation) { case LTTNG_KERNEL_TRACEPOINT: - ret = tracepoint_probe_unregister(event->desc->name, + ret = kabi_2635_tracepoint_probe_unregister(event->desc->kname, event->desc->probe_callback, event); if (ret) @@ -691,7 +720,7 @@ int _lttng_event_metadata_statedump(struct lttng_session *session, ret = lttng_metadata_printf(session, "event {\n" - " name = %s;\n" + " name = \"%s\";\n" " id = %u;\n" " stream_id = %u;\n", event->desc->name, @@ -794,11 +823,11 @@ int _lttng_stream_packet_context_declare(struct lttng_session *session) { return lttng_metadata_printf(session, "struct packet_context {\n" - " uint64_t timestamp_begin;\n" - " uint64_t timestamp_end;\n" - " uint32_t events_discarded;\n" - " uint32_t content_size;\n" - " uint32_t packet_size;\n" + " uint64_clock_monotonic_t timestamp_begin;\n" + " uint64_clock_monotonic_t timestamp_end;\n" + " uint64_t content_size;\n" + " uint64_t packet_size;\n" + " unsigned long events_discarded;\n" " uint32_t cpu_id;\n" "};\n\n" ); @@ -821,11 +850,11 @@ int _lttng_event_header_declare(struct lttng_session *session) " enum : uint5_t { compact = 0 ... 30, extended = 31 } id;\n" " variant {\n" " struct {\n" - " uint27_t timestamp;\n" + " uint27_clock_monotonic_t timestamp;\n" " } compact;\n" " struct {\n" " uint32_t id;\n" - " uint64_t timestamp;\n" + " uint64_clock_monotonic_t timestamp;\n" " } extended;\n" " } v;\n" "} align(%u);\n" @@ -834,11 +863,11 @@ int _lttng_event_header_declare(struct lttng_session *session) " enum : uint16_t { compact = 0 ... 65534, extended = 65535 } id;\n" " variant {\n" " struct {\n" - " uint32_t timestamp;\n" + " uint32_clock_monotonic_t timestamp;\n" " } compact;\n" " struct {\n" " uint32_t id;\n" - " uint64_t timestamp;\n" + " uint64_clock_monotonic_t timestamp;\n" " } extended;\n" " } v;\n" "} align(%u);\n\n", @@ -847,6 +876,33 @@ int _lttng_event_header_declare(struct lttng_session *session) ); } + /* + * Approximation of NTP time of day to clock monotonic correlation, + * taken at start of trace. + * Yes, this is only an approximation. Yes, we can (and will) do better + * in future versions. + */ +static +uint64_t measure_clock_offset(void) +{ + uint64_t offset, monotonic[2], realtime; + struct timespec rts = { 0, 0 }; + unsigned long flags; + + /* Disable interrupts to increase correlation precision. */ + local_irq_save(flags); + monotonic[0] = trace_clock_read64(); + getnstimeofday(&rts); + monotonic[1] = trace_clock_read64(); + local_irq_restore(flags); + + offset = (monotonic[0] + monotonic[1]) >> 1; + realtime = (uint64_t) rts.tv_sec * NSEC_PER_SEC; + realtime += rts.tv_nsec; + offset = realtime - offset; + return offset; +} + /* * Output metadata into this session's metadata buffers. */ @@ -854,7 +910,7 @@ static int _lttng_session_metadata_statedump(struct lttng_session *session) { unsigned char *uuid_c = session->uuid.b; - unsigned char uuid_s[37]; + unsigned char uuid_s[37], clock_uuid_s[BOOT_ID_LEN]; struct lttng_channel *chan; struct lttng_event *event; int ret = 0; @@ -880,6 +936,7 @@ int _lttng_session_metadata_statedump(struct lttng_session *session) "typealias integer { size = 16; align = %u; signed = false; } := uint16_t;\n" "typealias integer { size = 32; align = %u; signed = false; } := uint32_t;\n" "typealias integer { size = 64; align = %u; signed = false; } := uint64_t;\n" + "typealias integer { size = %u; align = %u; signed = false; } := unsigned long;\n" "typealias integer { size = 5; align = 1; signed = false; } := uint5_t;\n" "typealias integer { size = 27; align = 1; signed = false; } := uint27_t;\n" "\n" @@ -898,8 +955,10 @@ int _lttng_session_metadata_statedump(struct lttng_session *session) lttng_alignof(uint16_t) * CHAR_BIT, lttng_alignof(uint32_t) * CHAR_BIT, lttng_alignof(uint64_t) * CHAR_BIT, - CTF_VERSION_MAJOR, - CTF_VERSION_MINOR, + sizeof(unsigned long) * CHAR_BIT, + lttng_alignof(unsigned long) * CHAR_BIT, + CTF_SPEC_MAJOR, + CTF_SPEC_MINOR, uuid_s, #ifdef __BIG_ENDIAN "be" @@ -910,6 +969,79 @@ int _lttng_session_metadata_statedump(struct lttng_session *session) if (ret) goto end; + ret = lttng_metadata_printf(session, + "env {\n" + " hostname = \"%s\";\n" + " domain = \"kernel\";\n" + " sysname = \"%s\";\n" + " kernel_release = \"%s\";\n" + " kernel_version = \"%s\";\n" + " tracer_name = \"lttng-modules\";\n" + " tracer_major = %d;\n" + " tracer_minor = %d;\n" + " tracer_patchlevel = %d;\n" + "};\n\n", + current->nsproxy->uts_ns->name.nodename, + utsname()->sysname, + utsname()->release, + utsname()->version, + LTTNG_MODULES_MAJOR_VERSION, + LTTNG_MODULES_MINOR_VERSION, + LTTNG_MODULES_PATCHLEVEL_VERSION + ); + if (ret) + goto end; + + ret = lttng_metadata_printf(session, + "clock {\n" + " name = %s;\n", + "monotonic" + ); + if (ret) + goto end; + + if (!trace_clock_uuid(clock_uuid_s)) { + ret = lttng_metadata_printf(session, + " uuid = \"%s\";\n", + clock_uuid_s + ); + if (ret) + goto end; + } + + ret = lttng_metadata_printf(session, + " description = \"Monotonic Clock\";\n" + " freq = %llu; /* Frequency, in Hz */\n" + " /* clock value offset from Epoch is: offset * (1/freq) */\n" + " offset = %llu;\n" + "};\n\n", + (unsigned long long) trace_clock_freq(), + (unsigned long long) measure_clock_offset() + ); + if (ret) + goto end; + + ret = lttng_metadata_printf(session, + "typealias integer {\n" + " size = 27; align = 1; signed = false;\n" + " map = clock.monotonic.value;\n" + "} := uint27_clock_monotonic_t;\n" + "\n" + "typealias integer {\n" + " size = 32; align = %u; signed = false;\n" + " map = clock.monotonic.value;\n" + "} := uint32_clock_monotonic_t;\n" + "\n" + "typealias integer {\n" + " size = 64; align = %u; signed = false;\n" + " map = clock.monotonic.value;\n" + "} := uint64_clock_monotonic_t;\n\n", + lttng_alignof(uint32_t) * CHAR_BIT, + lttng_alignof(uint64_t) * CHAR_BIT + ); + if (ret) + goto end; + ret = _lttng_stream_packet_context_declare(session); if (ret) goto end;