2e2e54f8fe
This measure is not affected by uid removals and is monotonic. That makes it a good fit for CPU telemetry in statsd. Bug: 174245730 Test: manually compare total with uid breakdown Change-Id: I0f04f2ff09d77a4c7d9fe1e2b492f983b61987f6
74 lines
2.4 KiB
C
74 lines
2.4 KiB
C
/*
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* Copyright (C) 2019 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 <inttypes.h>
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#include <sys/types.h>
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#define BPF_FS_PATH "/sys/fs/bpf/"
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// Number of frequencies tracked in the array with total time. If some CPUs have
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// more than 64 freqs
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// // available, the overflow is stored in the last entry.
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#define MAX_FREQS_FOR_TOTAL 64
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// Number of frequencies for which a UID's times can be tracked in a single map entry. If some CPUs
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// have more than 32 freqs available, a single UID is tracked using 2 or more entries.
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#define FREQS_PER_ENTRY 32
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// Number of distinct CPU counts for which a UID's concurrent time stats can be tracked in a single
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// map entry. On systems with more than 8 CPUs, a single UID is tracked using 2 or more entries.
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#define CPUS_PER_ENTRY 8
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typedef struct {
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uint32_t uid;
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uint32_t bucket;
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} time_key_t;
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typedef struct {
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uint64_t ar[FREQS_PER_ENTRY];
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} tis_val_t;
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typedef struct {
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uint64_t active[CPUS_PER_ENTRY];
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uint64_t policy[CPUS_PER_ENTRY];
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} concurrent_val_t;
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typedef struct {
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uint32_t policy;
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uint32_t freq;
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} freq_idx_key_t;
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// Maximum number of processes whose thread CPU time-in-state can be tracked simultaneously.
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#define MAX_TRACKED_PIDS 8
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// Indicates that the pid_tracked_map item is unused and further items in the array are also
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// unused
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#define TRACKED_PID_STATE_UNUSED 0
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// Indicates that the pid_tracked_map item contains a PID that is currently tracked
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#define TRACKED_PID_STATE_ACTIVE 1
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// Indicates that the pid_tracked_map item is vacant, but further items in the array may
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// contain tracked PIDs
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#define TRACKED_PID_STATE_EXITED 2
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typedef struct {
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pid_t pid;
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// TRACKED_PID_STATE_UNUSED, TRACKED_PID_STATE_ACTIVE or TRACKED_PID_STATE_EXITED
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uint8_t state;
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} tracked_pid_t;
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typedef struct {
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pid_t tgid;
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uint16_t aggregation_key;
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uint16_t bucket;
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} aggregated_task_tis_key_t;
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