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bpf: move time in state struct definitions into a single shared header

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Key and value formats for time in state related BPF maps currently
have to be kept in sync between the BPF prog and
libtimeinstate. Add a new bpf_timeinstate.h header file in a directory
that already gets added to the include path for BPF progs, and add
this file to a cc_library_headers module so it can be used from
libtimeinstate as well.

Test: build libtimeinstate and time_in_state.o
Bug: 138317993
Change-Id: Ic56b2b64746f2211f3c802e074339750f26303c0
Signed-off-by: Connor O'Brien <connoro@google.com>
This commit is contained in:
Connor O'Brien 2019-09-03 14:53:51 -07:00
parent fa9d2adf1f
commit badb20f528
2 changed files with 65 additions and 0 deletions
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20
progs/Android.bp Normal file
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//
// Copyright (C) 2019 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.
//
cc_library_headers {
name: "bpf_prog_headers",
export_include_dirs: ["include"],
}

45
progs/include/bpf_timeinstate.h Normal file
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/*
* Copyright (C) 2019 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.
*/
#include <inttypes.h>
#define BPF_FS_PATH "/sys/fs/bpf/"
// Number of frequencies for which a UID's times can be tracked in a single map entry. If some CPUs
// have more than 32 freqs available, a single UID is tracked using 2 or more entries.
#define FREQS_PER_ENTRY 32
// Number of distinct CPU counts for which a UID's concurrent time stats can be tracked in a single
// map entry. On systems with more than 8 CPUs, a single UID is tracked using 2 or more entries.
#define CPUS_PER_ENTRY 8
typedef struct {
uint32_t uid;
uint32_t bucket;
} time_key_t;
typedef struct {
uint64_t ar[FREQS_PER_ENTRY];
} tis_val_t;
typedef struct {
uint64_t active[CPUS_PER_ENTRY];
uint64_t policy[CPUS_PER_ENTRY];
} concurrent_val_t;
typedef struct {
uint32_t policy;
uint32_t freq;
} freq_idx_key_t;