* you ever add/remove a field from this header. Packed attribute is not used
* because gcc generates poor code on at least powerpc and mips. Don't ever
* let gcc add padding between the structure elements.
+ *
+ * The guarantee we have with timestamps is that all the events in a
+ * packet are included (inclusive) within the begin/end timestamps of
+ * the packet. Another guarantee we have is that the "timestamp begin",
+ * as well as the event timestamps, are monotonically increasing (never
+ * decrease) when moving forward in a stream (physically). But this
+ * guarantee does not apply to "timestamp end", because it is sampled at
+ * commit time, which is not ordered with respect to space reservation.
*/
struct packet_header {
ctx_record(ctx, ltt_chan, ltt_chan->ctx);
ctx_record(ctx, ltt_chan, event->ctx);
+ lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
return;
}
ctx_record(ctx, ltt_chan, ltt_chan->ctx);
ctx_record(ctx, ltt_chan, event->ctx);
+ lib_ring_buffer_align_ctx(ctx, ctx->largest_align);
}
static const struct lib_ring_buffer_config client_config;
}
static
-wait_queue_head_t *ltt_get_reader_wait_queue(struct channel *chan)
+void ltt_event_write_from_user(struct lib_ring_buffer_ctx *ctx,
+ const void __user *src, size_t len)
+{
+ lib_ring_buffer_copy_from_user(&client_config, ctx, src, len);
+}
+
+static
+void ltt_event_memset(struct lib_ring_buffer_ctx *ctx,
+ int c, size_t len)
+{
+ lib_ring_buffer_memset(&client_config, ctx, c, len);
+}
+
+static
+wait_queue_head_t *ltt_get_writer_buf_wait_queue(struct channel *chan, int cpu)
{
- return &chan->read_wait;
+ struct lib_ring_buffer *buf = channel_get_ring_buffer(&client_config,
+ chan, cpu);
+ return &buf->write_wait;
}
static
.event_reserve = ltt_event_reserve,
.event_commit = ltt_event_commit,
.event_write = ltt_event_write,
+ .event_write_from_user = ltt_event_write_from_user,
+ .event_memset = ltt_event_memset,
.packet_avail_size = NULL, /* Would be racy anyway */
- .get_reader_wait_queue = ltt_get_reader_wait_queue,
+ .get_writer_buf_wait_queue = ltt_get_writer_buf_wait_queue,
.get_hp_wait_queue = ltt_get_hp_wait_queue,
.is_finalized = ltt_is_finalized,
.is_disabled = ltt_is_disabled,