Struct perfetto_consumer_proto::perfetto::protos::trace_stats::BufferStats

pub struct BufferStats {

    pub buffer_size: Option<u64>,
    pub bytes_written: Option<u64>,
    pub bytes_overwritten: Option<u64>,
    pub bytes_read: Option<u64>,
    pub padding_bytes_written: Option<u64>,
    pub padding_bytes_cleared: Option<u64>,
    pub chunks_written: Option<u64>,
    pub chunks_rewritten: Option<u64>,
    pub chunks_overwritten: Option<u64>,
    pub chunks_discarded: Option<u64>,
    pub chunks_read: Option<u64>,
    pub chunks_committed_out_of_order: Option<u64>,
    pub write_wrap_count: Option<u64>,
    pub patches_succeeded: Option<u64>,
    pub patches_failed: Option<u64>,
    pub readaheads_succeeded: Option<u64>,
    pub readaheads_failed: Option<u64>,
    pub abi_violations: Option<u64>,
    pub trace_writer_packet_loss: Option<u64>,
}

From TraceBuffer::Stats.

Next id: 21.

Fields

buffer_size: Option<u64>

Size of the circular buffer in bytes.

bytes_written: Option<u64>

Num. bytes written into the circular buffer, including chunk headers.

bytes_overwritten: Option<u64>

Num. bytes overwritten before they have been read (i.e. loss of data).

bytes_read: Option<u64>

Total size of chunks that were fully read from the circular buffer by the consumer. This may not be equal to |bytes_written| either in the middle of tracing, or if |chunks_overwritten| is non-zero. Note that this is the size of the chunks read from the buffer, including chunk headers, which will be different from the total size of packets returned to the consumer.

The current utilization of the trace buffer (mid-tracing) can be obtained by subtracting |bytes_read| and |bytes_overwritten| from |bytes_written|, adding the difference of |padding_bytes_written| and |padding_bytes_cleared|, and comparing this sum to the |buffer_size|. Note that this represents the total size of buffered data in the buffer, yet this data may be spread non-contiguously through the buffer and may be overridden before the utilization reaches 100%.

padding_bytes_written: Option<u64>

Num. bytes that were allocated as padding between chunks in the circular buffer.

padding_bytes_cleared: Option<u64>

Num. of padding bytes that were removed from the circular buffer when they were overwritten.

The difference between |padding_bytes_written| and |padding_bytes_cleared| denotes the total size of padding currently present in the buffer.

chunks_written: Option<u64>

Num. chunks (!= packets) written into the buffer.

chunks_rewritten: Option<u64>

Num. chunks (!= packets) rewritten into the buffer. This means we rewrote the same chunk with additional packets appended to the end.

chunks_overwritten: Option<u64>

Num. chunks overwritten before they have been read (i.e. loss of data).

chunks_discarded: Option<u64>

Num. chunks discarded (i.e. loss of data). Can be > 0 only when a buffer is configured with FillPolicy == DISCARD.

chunks_read: Option<u64>

Num. chunks (!= packets) that were fully read from the circular buffer by the consumer. This may not be equal to |chunks_written| either in the middle of tracing, or if |chunks_overwritten| is non-zero.

chunks_committed_out_of_order: Option<u64>

Num. chunks that were committed out of order.

write_wrap_count: Option<u64>

Num. times the ring buffer wrapped around.

patches_succeeded: Option<u64>

Num. out-of-band (OOB) patches that succeeded.

patches_failed: Option<u64>

Num. OOB patches that failed (e.g., the chunk to patch was gone).

readaheads_succeeded: Option<u64>

Num. readaheads (for large multi-chunk packet reads) that ended up in a successful packet read.

readaheads_failed: Option<u64>

Num. readaheads aborted because of missing chunks in the sequence stream. Note that a small number > 0 is totally expected: occasionally, when issuing a read, the very last packet in a sequence might be incomplete (because the producer is still writing it while we read). The read will stop at that point, for that sequence, increasing this counter.

abi_violations: Option<u64>

Num. of violations of the SharedMemoryABI found while writing or reading the buffer. This is an indication of either a bug in the producer(s) or malicious producer(s).

trace_writer_packet_loss: Option<u64>

Num. of times the service detected packet loss on a trace writer sequence. This is usually caused by exhaustion of available chunks in the writer process’s SMB. Note that this relies on the client’s TraceWriter indicating this loss to the service – packets lost for other reasons are not reflected in this stat.

Implementations

impl BufferStats

pub fn bytes_written(&self) -> u64

Returns the value of bytes_written, or the default value if bytes_written is unset.

pub fn chunks_written(&self) -> u64

Returns the value of chunks_written, or the default value if chunks_written is unset.

pub fn chunks_overwritten(&self) -> u64

Returns the value of chunks_overwritten, or the default value if chunks_overwritten is unset.

pub fn write_wrap_count(&self) -> u64

Returns the value of write_wrap_count, or the default value if write_wrap_count is unset.

pub fn patches_succeeded(&self) -> u64

Returns the value of patches_succeeded, or the default value if patches_succeeded is unset.

pub fn patches_failed(&self) -> u64

Returns the value of patches_failed, or the default value if patches_failed is unset.

pub fn readaheads_succeeded(&self) -> u64

Returns the value of readaheads_succeeded, or the default value if readaheads_succeeded is unset.

pub fn readaheads_failed(&self) -> u64

Returns the value of readaheads_failed, or the default value if readaheads_failed is unset.

pub fn abi_violations(&self) -> u64

Returns the value of abi_violations, or the default value if abi_violations is unset.

pub fn chunks_rewritten(&self) -> u64

Returns the value of chunks_rewritten, or the default value if chunks_rewritten is unset.

pub fn chunks_committed_out_of_order(&self) -> u64

Returns the value of chunks_committed_out_of_order, or the default value if chunks_committed_out_of_order is unset.

pub fn buffer_size(&self) -> u64

Returns the value of buffer_size, or the default value if buffer_size is unset.

pub fn bytes_overwritten(&self) -> u64

Returns the value of bytes_overwritten, or the default value if bytes_overwritten is unset.

pub fn bytes_read(&self) -> u64

Returns the value of bytes_read, or the default value if bytes_read is unset.

pub fn padding_bytes_written(&self) -> u64

Returns the value of padding_bytes_written, or the default value if padding_bytes_written is unset.

pub fn padding_bytes_cleared(&self) -> u64

Returns the value of padding_bytes_cleared, or the default value if padding_bytes_cleared is unset.

pub fn chunks_read(&self) -> u64

Returns the value of chunks_read, or the default value if chunks_read is unset.

pub fn chunks_discarded(&self) -> u64

Returns the value of chunks_discarded, or the default value if chunks_discarded is unset.

pub fn trace_writer_packet_loss(&self) -> u64

Returns the value of trace_writer_packet_loss, or the default value if trace_writer_packet_loss is unset.

Trait Implementations

impl Clone for BufferStats

fn clone(&self) -> BufferStats

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for BufferStats

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for BufferStats

fn default() -> Self

Returns the “default value” for a type.

impl Message for BufferStats

fn encoded_len(&self) -> usize

Returns the encoded length of the message without a length delimiter.

fn clear(&mut self)

Clears the message, resetting all fields to their default.

fn encode<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message to a buffer.

fn encode_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message to a newly allocated buffer.

fn encode_length_delimited<B>(&self, buf: &mut B) -> Result<(), EncodeError>

where B: BufMut, Self: Sized,

Encodes the message with a length-delimiter to a buffer.

fn encode_length_delimited_to_vec(&self) -> Vec<u8>

where Self: Sized,

Encodes the message with a length-delimiter to a newly allocated buffer.

fn decode<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes an instance of the message from a buffer.

fn decode_length_delimited<B>(buf: B) -> Result<Self, DecodeError>

where B: Buf, Self: Default,

Decodes a length-delimited instance of the message from the buffer.

fn merge<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes an instance of the message from a buffer, and merges it into self.

fn merge_length_delimited<B>(&mut self, buf: B) -> Result<(), DecodeError>

where B: Buf, Self: Sized,

Decodes a length-delimited instance of the message from buffer, and merges it into self.

impl PartialEq for BufferStats

fn eq(&self, other: &BufferStats) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for BufferStats