core/proto/android/os/pagetypeinfo.proto

/*
 * Copyright (C) 2017 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.
 */
syntax = "proto2";

option java_multiple_files = true;
option java_outer_classname = "PageTypeInfoProto";

package android.os;

/*
 *  /proc/pagetypeinfo exports free memory distributions.
 *
 *  For example, the order of a page ranges form 0 to 10.
 *  An order-0 page is 4 KB in size and 4 KB aligned.
 *  An order-1 page is 8 KB in size and 8 KB aligned.
 *  An order-10 page is 4096 KB in size and 4096 aligned.
 *  The memory has multiple zones, e.g. DMA zone, Normal zone
 *  Each zone has 11 free area. Each free area corresponds to pages of the same order.
 *  Each free area has 6 free list. Each corresponds to one migration type.
 *  The six migration types are Unmovable, Reclaimable, Movable, Reserve, CMA, and Isolate.
 *  Each zone has 11 * 6 = 66 free list.
 *
 *  Next tag: 5
 */
message PageTypeInfo {

    optional int32 page_block_order = 1;

    optional int32 pages_per_block = 2;

    repeated MigrateTypeProto migrate_types = 3;

    repeated BlockProto blocks = 4;
}

// Next tag: 5
message MigrateTypeProto {

    optional int32 node = 1;

    optional string zone = 2;

    optional string type = 3;

    // order level starts from 0 for 4KB to page_block_order defined above, e.g. 10 for 4096KB
    repeated int32 free_pages_count = 4;
}

// Next tag: 9
message BlockProto {

    optional int32 node = 1;

    optional string zone = 2;

    optional int32 unmovable = 3;

    optional int32 reclaimable = 4;

    optional int32 movable = 5;

    optional int32 cma = 6;

    optional int32 reserve = 7;

    optional int32 isolate = 8;
}