1 /*
2 * Copyright (C) 2019 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
17 #include "src/trace_processor/read_trace_internal.h"
18
19 #include "perfetto/base/logging.h"
20 #include "perfetto/ext/base/file_utils.h"
21 #include "perfetto/ext/base/scoped_file.h"
22 #include "perfetto/ext/base/scoped_mmap.h"
23 #include "perfetto/ext/base/utils.h"
24 #include "perfetto/protozero/proto_utils.h"
25 #include "perfetto/trace_processor/trace_processor.h"
26
27 #include "perfetto/trace_processor/trace_blob.h"
28 #include "perfetto/trace_processor/trace_blob_view.h"
29 #include "src/trace_processor/forwarding_trace_parser.h"
30 #include "src/trace_processor/importers/proto/proto_trace_tokenizer.h"
31 #include "src/trace_processor/util/gzip_utils.h"
32 #include "src/trace_processor/util/status_macros.h"
33
34 #include "protos/perfetto/trace/trace.pbzero.h"
35 #include "protos/perfetto/trace/trace_packet.pbzero.h"
36
37 namespace perfetto {
38 namespace trace_processor {
39 namespace {
40
41 // 1MB chunk size seems the best tradeoff on a MacBook Pro 2013 - i7 2.8 GHz.
42 constexpr size_t kChunkSize = 1024 * 1024;
43
ReadTraceUsingRead(TraceProcessor * tp,int fd,uint64_t * file_size,const std::function<void (uint64_t parsed_size)> & progress_callback)44 util::Status ReadTraceUsingRead(
45 TraceProcessor* tp,
46 int fd,
47 uint64_t* file_size,
48 const std::function<void(uint64_t parsed_size)>& progress_callback) {
49 // Load the trace in chunks using ordinary read().
50 for (int i = 0;; i++) {
51 if (progress_callback && i % 128 == 0)
52 progress_callback(*file_size);
53
54 TraceBlob blob = TraceBlob::Allocate(kChunkSize);
55 auto rsize = base::Read(fd, blob.data(), blob.size());
56 if (rsize == 0)
57 break;
58
59 if (rsize < 0) {
60 return util::ErrStatus("Reading trace file failed (errno: %d, %s)", errno,
61 strerror(errno));
62 }
63
64 *file_size += static_cast<uint64_t>(rsize);
65 TraceBlobView blob_view(std::move(blob), 0, static_cast<size_t>(rsize));
66 RETURN_IF_ERROR(tp->Parse(std::move(blob_view)));
67 }
68 return util::OkStatus();
69 }
70 } // namespace
71
ReadTraceUnfinalized(TraceProcessor * tp,const char * filename,const std::function<void (uint64_t parsed_size)> & progress_callback)72 util::Status ReadTraceUnfinalized(
73 TraceProcessor* tp,
74 const char* filename,
75 const std::function<void(uint64_t parsed_size)>& progress_callback) {
76 uint64_t bytes_read = 0;
77
78 #if PERFETTO_HAS_MMAP()
79 char* no_mmap = getenv("TRACE_PROCESSOR_NO_MMAP");
80 bool use_mmap = !no_mmap || *no_mmap != '1';
81
82 if (use_mmap) {
83 base::ScopedMmap mapped = base::ReadMmapWholeFile(filename);
84 if (mapped.IsValid()) {
85 size_t length = mapped.length();
86 TraceBlobView whole_mmap(TraceBlob::FromMmap(std::move(mapped)));
87 // Parse the file in chunks so we get some status update on stdio.
88 static constexpr size_t kMmapChunkSize = 128ul * 1024 * 1024;
89 while (bytes_read < length) {
90 progress_callback(bytes_read);
91 const size_t bytes_read_z = static_cast<size_t>(bytes_read);
92 size_t slice_size = std::min(length - bytes_read_z, kMmapChunkSize);
93 TraceBlobView slice = whole_mmap.slice_off(bytes_read_z, slice_size);
94 RETURN_IF_ERROR(tp->Parse(std::move(slice)));
95 bytes_read += slice_size;
96 } // while (slices)
97 } // if (mapped.IsValid())
98 } // if (use_mmap)
99 if (bytes_read == 0)
100 PERFETTO_LOG("Cannot use mmap on this system. Falling back on read()");
101 #endif // PERFETTO_HAS_MMAP()
102 if (bytes_read == 0) {
103 base::ScopedFile fd(base::OpenFile(filename, O_RDONLY));
104 if (!fd)
105 return util::ErrStatus("Could not open trace file (path: %s)", filename);
106 RETURN_IF_ERROR(
107 ReadTraceUsingRead(tp, *fd, &bytes_read, progress_callback));
108 }
109 tp->SetCurrentTraceName(filename);
110
111 if (progress_callback)
112 progress_callback(bytes_read);
113 return util::OkStatus();
114 }
115 } // namespace trace_processor
116 } // namespace perfetto
117