4ab009f0e7
These logs are not generally useful and can be considered to be spam by some. Drop them to VERBOSE so that we can be selectively enabled when debugging logd. Test: these logs do not appears by default. Change-Id: Ic2bb12552d6f191478777c21f500794de29c8b0a
115 lines
3.7 KiB
C++
115 lines
3.7 KiB
C++
/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "SerializedLogChunk.h"
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#include <android-base/logging.h>
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#include "CompressionEngine.h"
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SerializedLogChunk::~SerializedLogChunk() {
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CHECK_EQ(reader_ref_count_, 0U);
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}
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void SerializedLogChunk::Compress() {
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CHECK_EQ(compressed_log_.size(), 0U);
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CompressionEngine::GetInstance().Compress(contents_, write_offset_, compressed_log_);
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LOG(VERBOSE) << "Compressed Log, buffer max size: " << contents_.size()
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<< " size used: " << write_offset_
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<< " compressed size: " << compressed_log_.size();
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}
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// TODO: Develop a better reference counting strategy to guard against the case where the writer is
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// much faster than the reader, and we needlessly compess / decompress the logs.
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void SerializedLogChunk::IncReaderRefCount() {
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if (++reader_ref_count_ != 1 || writer_active_) {
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return;
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}
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contents_.Resize(write_offset_);
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CompressionEngine::GetInstance().Decompress(compressed_log_, contents_);
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}
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void SerializedLogChunk::DecReaderRefCount() {
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CHECK_NE(reader_ref_count_, 0U);
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if (--reader_ref_count_ != 0) {
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return;
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}
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if (!writer_active_) {
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contents_.Resize(0);
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}
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}
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bool SerializedLogChunk::ClearUidLogs(uid_t uid, log_id_t log_id, LogStatistics* stats) {
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CHECK_EQ(reader_ref_count_, 0U);
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if (write_offset_ == 0) {
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return true;
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}
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IncReaderRefCount();
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int read_offset = 0;
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int new_write_offset = 0;
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while (read_offset < write_offset_) {
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const auto* entry = log_entry(read_offset);
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if (entry->uid() == uid) {
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read_offset += entry->total_len();
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if (stats != nullptr) {
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stats->Subtract(entry->ToLogStatisticsElement(log_id));
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}
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continue;
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}
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size_t entry_total_len = entry->total_len();
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if (read_offset != new_write_offset) {
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memmove(contents_.data() + new_write_offset, contents_.data() + read_offset,
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entry_total_len);
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}
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read_offset += entry_total_len;
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new_write_offset += entry_total_len;
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}
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if (new_write_offset == 0) {
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DecReaderRefCount();
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return true;
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}
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// Clear the old compressed logs and set write_offset_ appropriately to compress the new
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// partially cleared log.
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if (new_write_offset != write_offset_) {
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write_offset_ = new_write_offset;
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if (!writer_active_) {
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compressed_log_.Resize(0);
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Compress();
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}
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}
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DecReaderRefCount();
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return false;
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}
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bool SerializedLogChunk::CanLog(size_t len) {
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return write_offset_ + len <= contents_.size();
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}
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SerializedLogEntry* SerializedLogChunk::Log(uint64_t sequence, log_time realtime, uid_t uid,
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pid_t pid, pid_t tid, const char* msg, uint16_t len) {
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auto new_log_address = contents_.data() + write_offset_;
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auto* entry = new (new_log_address) SerializedLogEntry(uid, pid, tid, sequence, realtime, len);
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memcpy(entry->msg(), msg, len);
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write_offset_ += entry->total_len();
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highest_sequence_number_ = sequence;
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return entry;
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}
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