1/* 2 * Copyright (C) 2018 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17syntax = "proto2"; 18 19package perfetto.protos; 20 21// Per-CPU stats for the ftrace data source gathered from the kernel from 22// /sys/kernel/debug/tracing/per_cpu/cpuX/stats. 23message FtraceCpuStats { 24 // CPU index. 25 optional uint64 cpu = 1; 26 27 // Number of entries still in the kernel buffer. Ideally this should be close 28 // to zero, as events are consumed regularly and moved into the userspace 29 // buffers (or file). 30 optional uint64 entries = 2; 31 32 // Number of events lost in kernel buffers due to overwriting of old events 33 // before userspace had a chance to drain them. 34 optional uint64 overrun = 3; 35 36 // This should always be zero. If not the buffer size is way too small or 37 // something went wrong with the tracer. 38 optional uint64 commit_overrun = 4; 39 40 // Bytes actually read (not overwritten). 41 optional uint64 bytes_read = 5; 42 43 // The timestamp for the oldest event still in the ring buffer. 44 optional double oldest_event_ts = 6; 45 46 // The current timestamp. 47 optional double now_ts = 7; 48 49 // If the kernel buffer has overwrite mode disabled, this will show the number 50 // of new events that were lost because the buffer was full. This is similar 51 // to |overrun| but only for the overwrite=false case. 52 optional uint64 dropped_events = 8; 53 54 // The number of events read. 55 optional uint64 read_events = 9; 56} 57 58// Ftrace stats for all CPUs. 59message FtraceStats { 60 enum Phase { 61 UNSPECIFIED = 0; 62 START_OF_TRACE = 1; 63 END_OF_TRACE = 2; 64 } 65 66 // Tells when stats were sampled. There should be one sample at the beginning 67 // of the trace and one sample at the end. 68 optional Phase phase = 1; 69 70 // Per-CPU stats (one entry for each CPU). 71 repeated FtraceCpuStats cpu_stats = 2; 72 73 // When FtraceConfig.symbolize_ksyms = true, this records the number of 74 // symbols parsed from /proc/kallsyms, whether they have been seen in the 75 // trace or not. It can be used to debug kptr_restrict or security-related 76 // errors. 77 // Note: this will be valid only when phase = END_OF_TRACE. The symbolizer is 78 // initialized. When START_OF_TRACE is emitted it is not ready yet. 79 optional uint32 kernel_symbols_parsed = 3; 80 81 // The memory used by the kernel symbolizer (KernelSymbolMap.size_bytes()). 82 optional uint32 kernel_symbols_mem_kb = 4; 83} 84