1/*
2 *  Copyright 2018 Google, Inc
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#ifndef _STATSLOG_H_
18#define _STATSLOG_H_
19
20#include <assert.h>
21#include <stats_event_list.h>
22#include <stdbool.h>
23#include <sys/cdefs.h>
24
25#include <cutils/properties.h>
26
27__BEGIN_DECLS
28
29/*
30 * These are defined in
31 * http://cs/android/frameworks/base/cmds/statsd/src/atoms.proto
32 */
33#define LMK_KILL_OCCURRED 51
34#define LMK_STATE_CHANGED 54
35#define LMK_STATE_CHANGE_START 1
36#define LMK_STATE_CHANGE_STOP 2
37
38/*
39 * The single event tag id for all stats logs.
40 * Keep this in sync with system/core/logcat/event.logtags
41 */
42const static int kStatsEventTag = 1937006964;
43
44static inline void statslog_init(android_log_context* log_ctx, bool* enable_stats_log) {
45    assert(log_ctx != NULL);
46    assert(enable_stats_log != NULL);
47    *enable_stats_log = property_get_bool("ro.lmk.log_stats", false);
48
49    if (*enable_stats_log) {
50        *log_ctx = create_android_logger(kStatsEventTag);
51    }
52}
53
54static inline void statslog_destroy(android_log_context* log_ctx) {
55    assert(log_ctx != NULL);
56    if (*log_ctx) {
57        android_log_destroy(log_ctx);
58    }
59}
60
61struct memory_stat {
62    int64_t pgfault;
63    int64_t pgmajfault;
64    int64_t rss_in_bytes;
65    int64_t cache_in_bytes;
66    int64_t swap_in_bytes;
67};
68
69#define MEMCG_PROCESS_MEMORY_STAT_PATH "/dev/memcg/apps/uid_%u/pid_%u/memory.stat"
70
71/**
72 * Logs the change in LMKD state which is used as start/stop boundaries for logging
73 * LMK_KILL_OCCURRED event.
74 * Code: LMK_STATE_CHANGED = 54
75 */
76int
77stats_write_lmk_state_changed(android_log_context ctx, int32_t code, int32_t state);
78
79/**
80 * Logs the event when LMKD kills a process to reduce memory pressure.
81 * Code: LMK_KILL_OCCURRED = 51
82 */
83int
84stats_write_lmk_kill_occurred(android_log_context ctx, int32_t code, int32_t uid,
85                              char const* process_name, int32_t oom_score, int64_t pgfault,
86                              int64_t pgmajfault, int64_t rss_in_bytes, int64_t cache_in_bytes,
87                              int64_t swap_in_bytes);
88
89__END_DECLS
90
91#endif /* _STATSLOG_H_ */
92