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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 {fromNs} from '../../common/time';
import {
TrackController,
trackControllerRegistry
} from '../../controller/track_controller';
import {
Config,
Data,
groupBusyStates,
THREAD_STATE_TRACK_KIND,
} from './common';
class ThreadStateTrackController extends TrackController<Config, Data> {
static readonly kind = THREAD_STATE_TRACK_KIND;
private busy = false;
private setup = false;
onBoundsChange(start: number, end: number, resolution: number): void {
this.update(start, end, resolution);
}
private async update(start: number, end: number, resolution: number):
Promise<void> {
if (this.busy) return;
this.busy = true;
const startNs = Math.round(start * 1e9);
const endNs = Math.round(end * 1e9);
let minNs = 0;
if (groupBusyStates(resolution)) {
// Ns for 20px (the smallest state to display)
minNs = Math.round(resolution * 20 * 1e9);
}
if (this.setup === false) {
await this.query(`create view ${this.tableName('sched_wakeup')} AS
select
ts,
lead(ts, 1, (select end_ts from trace_bounds))
OVER(order by ts) - ts as dur,
ref as utid
from instants
where name = 'sched_wakeup'
and utid = ${this.config.utid}`);
await this.query(
`create virtual table ${this.tableName('window')} using window;`);
// Get the first ts for this utid - whether a sched wakeup
// or sched event.
await this.query(`create view ${this.tableName('start')} as
select min(ts) as ts from
(select ts from ${this.tableName('sched_wakeup')} UNION
select ts from sched where utid = ${this.config.utid})`);
// Create an entry from first ts to either the first sched_wakeup
// or to the end if there are no sched wakeups. This means
// we will show all information we have even with no sched_wakeup events.
await this.query(`create view ${this.tableName('fill')} AS
select
(select ts from ${this.tableName('start')}),
(select coalesce(
(select min(ts) from ${this.tableName('sched_wakeup')}),
(select end_ts from trace_bounds)
)) - (select ts from ${this.tableName('start')}) as dur,
${this.config.utid} as utid
`);
await this.query(`create view ${this.tableName('full_sched_wakeup')} as
select * from ${this.tableName('sched_wakeup')} UNION
select * from ${this.tableName('fill')}`);
await this.query(`create virtual table ${this.tableName('span')}
using span_left_join(
${this.tableName('full_sched_wakeup')} partitioned utid,
sched partitioned utid)`);
// Need to compute the lag(end_state) before joining with the window
// table to avoid the first visible slice always having a null prev
// end state.
await this.query(`create view ${this.tableName('span_view')} as
select ts, dur, utid,
case
when end_state is not null
then 'Running'
when lag(end_state) over ${this.tableName('ordered')} is not null
then lag(end_state) over ${this.tableName('ordered')}
else 'Runnable'
end as state
from ${this.tableName('span')}
where utid = ${this.config.utid}
window ${this.tableName('ordered')} as (order by ts)`);
await this.query(`create view ${this.tableName('long_states')} as
select * from ${this.tableName('span_view')} where dur >= ${minNs}`);
// Create a slice from the first ts to the end of the trace. To
// be span joined with the long states - This effectively combines all
// of the short states into a single 'Busy' state.
await this.query(`create view ${this.tableName('fill_gaps')} as select
(select min(ts) from ${this.tableName('span_view')}) as ts,
(select end_ts from trace_bounds) -
(select min(ts) from ${this.tableName('span_view')}) as dur,
${this.config.utid} as utid`);
await this.query(`create virtual table ${this.tableName('summarized')}
using span_left_join(${this.tableName('fill_gaps')} partitioned utid,
${this.tableName('long_states')} partitioned utid)`);
await this.query(`create virtual table ${this.tableName('current')}
using span_join(
${this.tableName('window')},
${this.tableName('summarized')} partitioned utid)`);
this.setup = true;
}
const windowDurNs = Math.max(1, endNs - startNs);
this.query(`update ${this.tableName('window')} set
window_start=${startNs},
window_dur=${windowDurNs},
quantum=0`);
this.query(`drop view if exists ${this.tableName('long_states')}`);
this.query(`drop view if exists ${this.tableName('fill_gaps')}`);
await this.query(`create view ${this.tableName('long_states')} as
select * from ${this.tableName('span_view')} where dur > ${minNs}`);
await this.query(`create view ${this.tableName('fill_gaps')} as select
(select min(ts) from ${this.tableName('span_view')}) as ts,
(select end_ts from trace_bounds) - (select min(ts) from ${
this.tableName(
'span_view')
}) as dur,
${this.config.utid} as utid`);
const query = `select ts, cast(dur as double), utid,
case when state is not null then state else 'Busy' end as state
from ${this.tableName('current')}`;
const result = await this.query(query);
const numRows = +result.numRecords;
const summary: Data = {
start,
end,
resolution,
starts: new Float64Array(numRows),
ends: new Float64Array(numRows),
strings: [],
state: new Uint16Array(numRows)
};
const stringIndexes = new Map<string, number>();
function internString(str: string) {
let idx = stringIndexes.get(str);
if (idx !== undefined) return idx;
idx = summary.strings.length;
summary.strings.push(str);
stringIndexes.set(str, idx);
return idx;
}
for (let row = 0; row < numRows; row++) {
const cols = result.columns;
const start = fromNs(+cols[0].longValues![row]);
summary.starts[row] = start;
summary.ends[row] = start + fromNs(+cols[1].doubleValues![row]);
summary.state[row] = internString(cols[3].stringValues![row]);
}
this.publish(summary);
this.busy = false;
}
private async query(query: string) {
const result = await this.engine.query(query);
if (result.error) {
console.error(`Query error "${query}": ${result.error}`);
throw new Error(`Query error "${query}": ${result.error}`);
}
return result;
}
onDestroy(): void {
if (this.setup) {
this.query(`drop table ${this.tableName('window')}`);
this.query(`drop table ${this.tableName('span')}`);
this.query(`drop table ${this.tableName('current')}`);
this.query(`drop table ${this.tableName('summarized')}`);
this.query(`drop view ${this.tableName('sched_wakeup')}`);
this.query(`drop view ${this.tableName('fill')}`);
this.query(`drop view ${this.tableName('full_sched_wakeup')}`);
this.query(`drop view ${this.tableName('span_view')}`);
this.query(`drop view ${this.tableName('long_states')}`);
this.query(`drop view ${this.tableName('fill_gaps')}`);
this.setup = false;
}
}
}
trackControllerRegistry.register(ThreadStateTrackController);
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