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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __MEMTRACK_H__
#define __MEMTRACK_H__
#include <sys/types.h>
#include <map>
#include <string>
#include <vector>
#define DEFAULT_SLEEP_DELAY_SECONDS 5
#define NS_PER_SEC 1000000000LL
class FileData {
public:
FileData(char *filename, char *buffer, size_t buffer_len);
~FileData();
// Get the PSS information from the file data. If there are no more
// PSS values to be found, return false.
bool getPss(size_t *pss);
// Check if there is at least bytes available in the file data.
bool isAvail(size_t bytes);
private:
int fd_;
char *data_;
size_t max_;
size_t cur_idx_;
size_t len_;
bool read_complete_;
};
typedef struct {
std::string name;
size_t max_num_pids;
size_t num_samples;
double avg_pss_kb;
size_t min_pss_kb;
size_t max_pss_kb;
size_t last_pss_kb;
std::vector<int> pids;
} process_info_t;
typedef std::map<std::string, process_info_t> processes_t;
typedef struct {
size_t pss_kb;
std::vector<int> pids;
} cur_process_info_t;
typedef std::map<std::string, cur_process_info_t> cur_processes_t;
class ProcessInfo {
public:
ProcessInfo();
~ProcessInfo();
// Get the information about a single process.
bool getInformation(int pid, char *pid_str, size_t pid_str_len);
// Scan all of the running processes.
void scan();
// Dump the information about all of the processes in the system to the log.
void dumpToLog();
private:
static const size_t kBufferLen = 4096;
static const size_t kCmdNameLen = 1024;
static const char *kProc;
static const size_t kProcLen = 6;
static const char *kCmdline;
static const size_t kCmdlineLen = 9; // Includes \0 at end of string.
static const char *kSmaps;
static const size_t kSmapsLen = 7; // Includes \0 at end of string.
static const char *kStatus;
static const size_t kStatusLen = 8; // Includes \0 at end of string.
static const size_t kInitialEntries = 1000;
char proc_file_[PATH_MAX];
char buffer_[kBufferLen];
char cmd_name_[kCmdNameLen];
// Minimize a need for a lot of allocations by keeping our maps and
// lists in this object.
processes_t all_;
cur_processes_t cur_;
std::vector<const process_info_t *> list_;
// Compute a running average.
static inline void computeAvg(double *running_avg, size_t cur_avg,
size_t num_samples) {
*running_avg = (*running_avg/(num_samples+1))*num_samples
+ (double)cur_avg/(num_samples+1);
}
};
#endif // __MEMTRACK_H__
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