int lttng_add_vpid_to_ctx(struct lttng_ctx **ctx)
{
struct lttng_ctx_field *field;
field = lttng_append_context(ctx);
if (!field)
return -ENOMEM;
if (lttng_find_context(*ctx, "vpid")) {
lttng_remove_context_field(ctx, field);
return -EEXIST;
}
field->event_field.name = "vpid";
field->event_field.type.atype = atype_integer;
field->event_field.type.u.basic.integer.size = sizeof(pid_t) * CHAR_BIT;
field->event_field.type.u.basic.integer.alignment = lttng_alignof(pid_t) * CHAR_BIT;
field->event_field.type.u.basic.integer.signedness = lttng_is_signed_type(pid_t);
field->event_field.type.u.basic.integer.reverse_byte_order = 0;
field->event_field.type.u.basic.integer.base = 10;
field->event_field.type.u.basic.integer.encoding = lttng_encode_none;
field->get_size = vpid_get_size;
field->record = vpid_record;
field->get_value = vpid_get_value;
lttng_context_update(*ctx);
wrapper_vmalloc_sync_all();
return 0;
}
static
void vppid_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
struct task_struct *parent;
pid_t vppid;
/*
* current nsproxy can be NULL when scheduled out of exit. pid_vnr uses
* the current thread nsproxy to perform the lookup.
*/
/*
* TODO: when we eventually add RCU subsystem instrumentation,
* taking the rcu read lock here will trigger RCU tracing
* recursively. We should modify the kernel synchronization so
* it synchronizes both for RCU and RCU sched, and rely on
* rcu_read_lock_sched_notrace.
*/
rcu_read_lock();
parent = rcu_dereference(current->real_parent);
if (!current->nsproxy)
vppid = 0;
else
vppid = task_tgid_vnr(parent);
rcu_read_unlock();
lib_ring_buffer_align_ctx(ctx, lttng_alignof(vppid));
chan->ops->event_write(ctx, &vppid, sizeof(vppid));
}
static
size_t vpid_get_size(size_t offset)
{
size_t size = 0;
size += lib_ring_buffer_align(offset, lttng_alignof(pid_t));
size += sizeof(pid_t);
return size;
}
static
size_t interruptible_get_size(size_t offset)
{
size_t size = 0;
size += lib_ring_buffer_align(offset, lttng_alignof(int8_t));
size += sizeof(int8_t);
return size;
}
static
void vpid_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
pid_t vpid = wrapper_getvpid();
lib_ring_buffer_align_ctx(ctx, lttng_alignof(vpid));
chan->ops->event_write(ctx, &vpid, sizeof(vpid));
}
static
void pthread_id_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
unsigned long pthread_id;
pthread_id = (unsigned long) pthread_self();
lib_ring_buffer_align_ctx(ctx, lttng_alignof(pthread_id));
chan->ops->event_write(ctx, &pthread_id, sizeof(pthread_id));
}
static
void cpu_id_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
int cpu;
cpu = lttng_ust_get_cpu();
lib_ring_buffer_align_ctx(ctx, lttng_alignof(cpu));
chan->ops->event_write(ctx, &cpu, sizeof(cpu));
}
static
void ip_record(struct lttng_ctx_field *field,
struct lttng_ust_lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
void *ip;
ip = ctx->ip;
lib_ring_buffer_align_ctx(ctx, lttng_alignof(ip));
chan->ops->event_write(ctx, &ip, sizeof(ip));
}
static
void tid_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
pid_t tid;
tid = task_pid_nr(current);
lib_ring_buffer_align_ctx(ctx, lttng_alignof(tid));
chan->ops->event_write(ctx, &tid, sizeof(tid));
}
static
void prio_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
int prio;
prio = wrapper_task_prio_sym(current);
lib_ring_buffer_align_ctx(ctx, lttng_alignof(prio));
chan->ops->event_write(ctx, &prio, sizeof(prio));
}
static
void interruptible_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
struct lttng_probe_ctx *lttng_probe_ctx = ctx->priv;
int8_t interruptible = lttng_probe_ctx->interruptible;
lib_ring_buffer_align_ctx(ctx, lttng_alignof(interruptible));
chan->ops->event_write(ctx, &interruptible, sizeof(interruptible));
}
static
void nice_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
int nice;
nice = task_nice(current);
lib_ring_buffer_align_ctx(ctx, lttng_alignof(nice));
chan->ops->event_write(ctx, &nice, sizeof(nice));
}
static
void vpid_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
pid_t vpid;
/*
* nsproxy can be NULL when scheduled out of exit.
*/
if (!current->nsproxy)
vpid = 0;
else
vpid = task_tgid_vnr(current);
lib_ring_buffer_align_ctx(ctx, lttng_alignof(vpid));
chan->ops->event_write(ctx, &vpid, sizeof(vpid));
}
static
void ppid_record(struct lttng_ctx_field *field,
struct lib_ring_buffer_ctx *ctx,
struct lttng_channel *chan)
{
pid_t ppid;
/*
* TODO: when we eventually add RCU subsystem instrumentation,
* taking the rcu read lock here will trigger RCU tracing
* recursively. We should modify the kernel synchronization so
* it synchronizes both for RCU and RCU sched, and rely on
* rcu_read_lock_sched_notrace.
*/
rcu_read_lock();
ppid = task_tgid_nr(current->real_parent);
rcu_read_unlock();
lib_ring_buffer_align_ctx(ctx, lttng_alignof(ppid));
chan->ops->event_write(ctx, &ppid, sizeof(ppid));
}
