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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.
import {Engine} from '../common/engine';
import {fromNs} from '../common/time';
import {SliceDetails} from '../frontend/globals';
import {Controller} from './controller';
import {globals} from './globals';
export interface SelectionControllerArgs {
engine: Engine;
}
// This class queries the TP for the details on a specific slice that has
// been clicked.
export class SelectionController extends Controller<'main'> {
private lastSelectedSlice?: number;
constructor(private args: SelectionControllerArgs) {
super('main');
}
run() {
const selection = globals.state.currentSelection;
if (selection === null ||
selection.kind !== 'SLICE' ||
selection.id === this.lastSelectedSlice) {
return;
}
const selectedSlice = selection.id;
this.lastSelectedSlice = selectedSlice;
if (selectedSlice !== undefined) {
const sqlQuery = `SELECT ts, dur, priority, end_state, utid FROM sched
WHERE row_id = ${selectedSlice}`;
this.args.engine.query(sqlQuery).then(result => {
// Check selection is still the same on completion of query.
const selection = globals.state.currentSelection;
if (result.numRecords === 1 &&
selection &&
selection.kind === 'SLICE' &&
selection.id === selectedSlice) {
const ts = result.columns[0].longValues![0] as number;
const timeFromStart = fromNs(ts) - globals.state.traceTime.startSec;
const dur = fromNs(result.columns[1].longValues![0] as number);
const priority = result.columns[2].longValues![0] as number;
const endState = result.columns[3].stringValues![0];
const selected:
SliceDetails = {ts: timeFromStart, dur, priority, endState};
const utid = result.columns[4].longValues![0];
this.schedulingDetails(ts, utid).then(wakeResult => {
Object.assign(selected, wakeResult);
globals.publish('SliceDetails', selected);
});
}
});
}
}
async schedulingDetails(ts: number, utid: number|Long) {
// Find the ts of the first sched_wakeup before the current slice.
const queryWakeupTs = `select ts from instants where name = 'sched_wakeup'
and ref = ${utid} and ts < ${ts} order by ts desc limit 1`;
const wakeupRow = await this.args.engine.queryOneRow(queryWakeupTs);
// Find the previous sched slice for the current utid.
const queryPrevSched = `select ts from sched where utid = ${utid}
and ts < ${ts} order by ts desc limit 1`;
const prevSchedRow = await this.args.engine.queryOneRow(queryPrevSched);
// If this is the first sched slice for this utid or if the wakeup found
// was after the previous slice then we know the wakeup was for this slice.
if (prevSchedRow[0] && wakeupRow[0] < prevSchedRow[0]) {
return undefined;
}
const wakeupTs = wakeupRow[0];
// Find the sched slice with the utid of the waker running when the
// sched wakeup occurred. This is the waker.
const queryWaker = `select utid, cpu from sched where utid =
(select utid from raw where name = 'sched_wakeup' and ts = ${wakeupTs})
and ts < ${wakeupTs} and ts + dur >= ${wakeupTs};`;
const wakerRow = await this.args.engine.queryOneRow(queryWaker);
if (wakerRow) {
return {
wakeupTs: fromNs(wakeupTs),
wakerUtid: wakerRow[0],
wakerCpu: wakerRow[1]
};
} else {
return undefined;
}
}
}
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