#include <linux/jhash.h>
#include <linux/uaccess.h>
#include <linux/vmalloc.h>
-#include <linux/uuid.h>
#include <linux/dmi.h>
-#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_all() */
+#include <wrapper/uuid.h>
+#include <wrapper/vmalloc.h> /* for wrapper_vmalloc_sync_mappings() */
#include <wrapper/random.h>
#include <wrapper/tracepoint.h>
#include <wrapper/list.h>
#include <lttng-string-utils.h>
#include <wrapper/ringbuffer/backend.h>
#include <wrapper/ringbuffer/frontend.h>
+#include <wrapper/time.h>
#define METADATA_CACHE_DEFAULT_SIZE 4096
goto err;
INIT_LIST_HEAD(&session->chan);
INIT_LIST_HEAD(&session->events);
- uuid_le_gen(&session->uuid);
+ lttng_guid_gen(&session->uuid);
metadata_cache = kzalloc(sizeof(struct lttng_metadata_cache),
GFP_KERNEL);
ret = -EINVAL;
break;
case LTTNG_KERNEL_KPROBE:
- case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
WRITE_ONCE(event->enabled, 1);
case LTTNG_KERNEL_KRETPROBE:
ret = lttng_kretprobes_event_enable_state(event, 1);
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
ret = -EINVAL;
break;
case LTTNG_KERNEL_KPROBE:
- case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_NOOP:
WRITE_ONCE(event->enabled, 0);
case LTTNG_KERNEL_KRETPROBE:
ret = lttng_kretprobes_event_enable_state(event, 0);
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_KRETPROBE:
- case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_SYSCALL:
event_name = event_param->name;
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through. */
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
list_add(&event_return->list, &chan->session->events);
break;
}
- case LTTNG_KERNEL_FUNCTION:
- /*
- * Needs to be explicitly enabled after creation, since
- * we may want to apply filters.
- */
- event->enabled = 0;
- event->registered = 1;
- /*
- * Populate lttng_event structure before event
- * registration.
- */
- smp_wmb();
- ret = lttng_ftrace_register(event_name,
- event_param->u.ftrace.symbol_name,
- event);
- if (ret) {
- goto register_error;
- }
- ret = try_module_get(event->desc->owner);
- WARN_ON_ONCE(!ret);
- break;
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_SYSCALL:
/*
ret = try_module_get(event->desc->owner);
WARN_ON_ONCE(!ret);
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through */
default:
WARN_ON_ONCE(1);
ret = -EINVAL;
case LTTNG_KERNEL_KPROBE:
case LTTNG_KERNEL_UPROBE:
case LTTNG_KERNEL_KRETPROBE:
- case LTTNG_KERNEL_FUNCTION:
case LTTNG_KERNEL_NOOP:
ret = 0;
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through */
default:
WARN_ON_ONCE(1);
}
lttng_kretprobes_unregister(event);
ret = 0;
break;
- case LTTNG_KERNEL_FUNCTION:
- lttng_ftrace_unregister(event);
- ret = 0;
- break;
case LTTNG_KERNEL_SYSCALL:
ret = lttng_syscall_filter_disable(event->chan,
desc->name);
lttng_uprobes_unregister(event);
ret = 0;
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through */
default:
WARN_ON_ONCE(1);
}
module_put(event->desc->owner);
lttng_kretprobes_destroy_private(event);
break;
- case LTTNG_KERNEL_FUNCTION:
- module_put(event->desc->owner);
- lttng_ftrace_destroy_private(event);
- break;
case LTTNG_KERNEL_NOOP:
case LTTNG_KERNEL_SYSCALL:
break;
module_put(event->desc->owner);
lttng_uprobes_destroy_private(event);
break;
+ case LTTNG_KERNEL_FUNCTION: /* Fall-through */
default:
WARN_ON_ONCE(1);
}
* was written and a negative value on error.
*/
int lttng_metadata_output_channel(struct lttng_metadata_stream *stream,
- struct channel *chan)
+ struct channel *chan, bool *coherent)
{
struct lib_ring_buffer_ctx ctx;
int ret = 0;
ret = stream->transport->ops.event_reserve(&ctx, 0);
if (ret != 0) {
printk(KERN_WARNING "LTTng: Metadata event reservation failed\n");
+ stream->coherent = false;
goto end;
}
stream->transport->ops.event_write(&ctx,
reserve_len);
stream->transport->ops.event_commit(&ctx);
stream->metadata_in += reserve_len;
+ if (reserve_len < len || stream->metadata_cache->producing != 0)
+ stream->coherent = false;
+ else
+ stream->coherent = true;
ret = reserve_len;
end:
+ if (coherent)
+ *coherent = stream->coherent;
mutex_unlock(&stream->metadata_cache->lock);
return ret;
}
+static
+void lttng_metadata_begin(struct lttng_session *session)
+{
+ mutex_lock(&session->metadata_cache->lock);
+ session->metadata_cache->producing++;
+ mutex_unlock(&session->metadata_cache->lock);
+}
+
+static
+void lttng_metadata_end(struct lttng_session *session)
+{
+ mutex_lock(&session->metadata_cache->lock);
+ WARN_ON_ONCE(!session->metadata_cache->producing);
+ session->metadata_cache->producing--;
+ mutex_unlock(&session->metadata_cache->lock);
+}
+
/*
* Write the metadata to the metadata cache.
* Must be called with sessions_mutex held.
* The metadata cache lock protects us from concurrent read access from
* thread outputting metadata content to ring buffer.
+ * The content of the printf is printed as a single atomic metadata
+ * transaction.
*/
int lttng_metadata_printf(struct lttng_session *session,
const char *fmt, ...)
len = strlen(str);
mutex_lock(&session->metadata_cache->lock);
+ session->metadata_cache->producing++;
if (session->metadata_cache->metadata_written + len >
session->metadata_cache->cache_alloc) {
char *tmp_cache_realloc;
session->metadata_cache->metadata_written,
str, len);
session->metadata_cache->metadata_written += len;
+ session->metadata_cache->producing--;
mutex_unlock(&session->metadata_cache->lock);
kfree(str);
return 0;
err:
+ session->metadata_cache->producing--;
mutex_unlock(&session->metadata_cache->lock);
kfree(str);
return -ENOMEM;
/*
* Must be called with sessions_mutex held.
+ * The entire event metadata is printed as a single atomic metadata
+ * transaction.
*/
static
int _lttng_event_metadata_statedump(struct lttng_session *session,
if (chan->channel_type == METADATA_CHANNEL)
return 0;
+ lttng_metadata_begin(session);
+
ret = lttng_metadata_printf(session,
"event {\n"
" name = \"%s\";\n"
event->metadata_dumped = 1;
end:
+ lttng_metadata_end(session);
return ret;
}
/*
* Must be called with sessions_mutex held.
+ * The entire channel metadata is printed as a single atomic metadata
+ * transaction.
*/
static
int _lttng_channel_metadata_statedump(struct lttng_session *session,
if (chan->channel_type == METADATA_CHANNEL)
return 0;
+ lttng_metadata_begin(session);
+
WARN_ON_ONCE(!chan->header_type);
ret = lttng_metadata_printf(session,
"stream {\n"
chan->metadata_dumped = 1;
end:
+ lttng_metadata_end(session);
return ret;
}
* in future versions.
* This function may return a negative offset. It may happen if the
* system sets the REALTIME clock to 0 after boot.
+ *
+ * Use 64bit timespec on kernels that have it, this makes 32bit arch
+ * y2038 compliant.
*/
static
int64_t measure_clock_offset(void)
uint64_t monotonic_avg, monotonic[2], realtime;
uint64_t tcf = trace_clock_freq();
int64_t offset;
- struct timespec rts = { 0, 0 };
unsigned long flags;
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+ struct timespec64 rts = { 0, 0 };
+#else
+ struct timespec rts = { 0, 0 };
+#endif
/* Disable interrupts to increase correlation precision. */
local_irq_save(flags);
monotonic[0] = trace_clock_read64();
+#ifdef LTTNG_KERNEL_HAS_TIMESPEC64
+ ktime_get_real_ts64(&rts);
+#else
getnstimeofday(&rts);
+#endif
monotonic[1] = trace_clock_read64();
local_irq_restore(flags);
static
int print_escaped_ctf_string(struct lttng_session *session, const char *string)
{
- int ret;
+ int ret = 0;
size_t i;
char cur;
if (!READ_ONCE(session->active))
return 0;
+
+ lttng_metadata_begin(session);
+
if (session->metadata_dumped)
goto skip_session;
}
session->metadata_dumped = 1;
end:
+ lttng_metadata_end(session);
return ret;
}
* Registers a transport which can be used as output to extract the data out of
* LTTng. The module calling this registration function must ensure that no
* trap-inducing code will be executed by the transport functions. E.g.
- * vmalloc_sync_all() must be called between a vmalloc and the moment the memory
+ * vmalloc_sync_mappings() must be called between a vmalloc and the moment the memory
* is made visible to the transport function. This registration acts as a
- * vmalloc_sync_all. Therefore, only if the module allocates virtual memory
+ * vmalloc_sync_mappings. Therefore, only if the module allocates virtual memory
* after its registration must it synchronize the TLBs.
*/
void lttng_transport_register(struct lttng_transport *transport)
/*
* Make sure no page fault can be triggered by the module about to be
* registered. We deal with this here so we don't have to call
- * vmalloc_sync_all() in each module's init.
+ * vmalloc_sync_mappings() in each module's init.
*/
- wrapper_vmalloc_sync_all();
+ wrapper_vmalloc_sync_mappings();
mutex_lock(&sessions_mutex);
list_add_tail(&transport->node, <tng_transport_list);
projects / lttng-modules.git / blobdiff