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// Copyright (C) 2018 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.
import {assertTrue} from '../../base/logging';
import {slowlyCountRows} from '../../common/query_iterator';
import {fromNs, toNs} from '../../common/time';
import {
TrackController,
trackControllerRegistry
} from '../../controller/track_controller';
import {Config, CPU_SLICE_TRACK_KIND, Data} from './common';
class CpuSliceTrackController extends TrackController<Config, Data> {
static readonly kind = CPU_SLICE_TRACK_KIND;
private cachedBucketNs = Number.MAX_SAFE_INTEGER;
private maxDurNs = 0;
async onSetup() {
await this.query(`
create view ${this.tableName('sched')} as
select
ts,
dur,
utid,
id
from sched
where cpu = ${this.config.cpu} and utid != 0
`);
const rawResult = await this.query(`
select max(dur), count(1)
from ${this.tableName('sched')}
`);
this.maxDurNs = rawResult.columns[0].longValues![0];
const rowCount = rawResult.columns[1].longValues![0];
const bucketNs = this.cachedBucketSizeNs(rowCount);
if (bucketNs === undefined) {
return;
}
await this.query(`
create table ${this.tableName('sched_cached')} as
select
(ts + ${bucketNs / 2}) / ${bucketNs} * ${bucketNs} as cached_tsq,
ts,
max(dur) as dur,
utid,
id
from ${this.tableName('sched')}
group by cached_tsq
order by cached_tsq
`);
this.cachedBucketNs = bucketNs;
}
async onBoundsChange(start: number, end: number, resolution: number):
Promise<Data> {
const resolutionNs = toNs(resolution);
// The resolution should always be a power of two for the logic of this
// function to make sense.
assertTrue(Math.log2(resolutionNs) % 1 === 0);
const startNs = toNs(start);
const endNs = toNs(end);
// ns per quantization bucket (i.e. ns per pixel). /2 * 2 is to force it to
// be an even number, so we can snap in the middle.
const bucketNs =
Math.max(Math.round(resolutionNs * this.pxSize() / 2) * 2, 1);
const isCached = this.cachedBucketNs <= bucketNs;
const queryTsq = isCached ?
`cached_tsq / ${bucketNs} * ${bucketNs}` :
`(ts + ${bucketNs / 2}) / ${bucketNs} * ${bucketNs}`;
const queryTable =
isCached ? this.tableName('sched_cached') : this.tableName('sched');
const constainColumn = isCached ? 'cached_tsq' : 'ts';
const rawResult = await this.query(`
select
${queryTsq} as tsq,
ts,
max(dur) as dur,
utid,
id
from ${queryTable}
where
${constainColumn} >= ${startNs - this.maxDurNs} and
${constainColumn} <= ${endNs}
group by tsq
order by tsq
`);
const numRows = slowlyCountRows(rawResult);
const slices: Data = {
start,
end,
resolution,
length: numRows,
ids: new Float64Array(numRows),
starts: new Float64Array(numRows),
ends: new Float64Array(numRows),
utids: new Uint32Array(numRows),
};
const cols = rawResult.columns;
for (let row = 0; row < numRows; row++) {
const startNsQ = +cols[0].longValues![row];
const startNs = +cols[1].longValues![row];
const durNs = +cols[2].longValues![row];
const endNs = startNs + durNs;
let endNsQ = Math.floor((endNs + bucketNs / 2 - 1) / bucketNs) * bucketNs;
endNsQ = Math.max(endNsQ, startNsQ + bucketNs);
if (startNsQ === endNsQ) {
throw new Error('Should never happen');
}
slices.starts[row] = fromNs(startNsQ);
slices.ends[row] = fromNs(endNsQ);
slices.utids[row] = +cols[3].longValues![row];
slices.ids[row] = +cols[4].longValues![row];
}
return slices;
}
async onDestroy() {
await this.query(`drop table if exists ${this.tableName('sched_cached')}`);
}
}
trackControllerRegistry.register(CpuSliceTrackController);
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