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// Copyright (C) 2021 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 {Plugin, PluginContextTrace, PluginDescriptor} from '../../public';
import {NUM, NUM_NULL} from '../../trace_processor/query_result';
import {
Config as ProcessSchedulingTrackConfig,
PROCESS_SCHEDULING_TRACK_KIND,
ProcessSchedulingTrack,
} from './process_scheduling_track';
import {
Config as ProcessSummaryTrackConfig,
PROCESS_SUMMARY_TRACK,
ProcessSummaryTrack,
} from './process_summary_track';
// This plugin now manages both process "scheduling" and "summary" tracks.
class ProcessSummaryPlugin implements Plugin {
async onTraceLoad(ctx: PluginContextTrace): Promise<void> {
await this.addProcessTrackGroups(ctx);
await this.addKernelThreadSummary(ctx);
}
private async addProcessTrackGroups(ctx: PluginContextTrace): Promise<void> {
const result = await ctx.engine.query(`
select *
from (
select
_process_available_info_summary.upid,
null as utid,
pid,
null as tid,
process.name as processName,
null as threadName,
sum_running_dur > 0 as hasSched,
android_process_metadata.debuggable as isDebuggable
from _process_available_info_summary
join process using(upid)
left join android_process_metadata using(upid)
)
union all
select *
from (
select
null,
utid,
null as pid,
tid,
null as processName,
thread.name threadName,
sum_running_dur > 0 as hasSched,
0 as isDebuggable
from _thread_available_info_summary
join thread using (utid)
where upid is null
)
`);
const it = result.iter({
upid: NUM_NULL,
utid: NUM_NULL,
pid: NUM_NULL,
tid: NUM_NULL,
hasSched: NUM_NULL,
isDebuggable: NUM_NULL,
});
for (; it.valid(); it.next()) {
const upid = it.upid;
const utid = it.utid;
const pid = it.pid;
const tid = it.tid;
const hasSched = Boolean(it.hasSched);
const isDebuggable = Boolean(it.isDebuggable);
// Group by upid if present else by utid.
const pidForColor = pid ?? tid ?? upid ?? utid ?? 0;
const type = hasSched ? 'schedule' : 'summary';
const uri = `perfetto.ProcessScheduling#${upid}.${utid}.${type}`;
if (hasSched) {
const config: ProcessSchedulingTrackConfig = {
pidForColor,
upid,
utid,
};
ctx.registerTrack({
uri,
displayName: `${upid === null ? tid : pid} schedule`,
kind: PROCESS_SCHEDULING_TRACK_KIND,
tags: {
isDebuggable,
},
trackFactory: () => {
return new ProcessSchedulingTrack(ctx.engine, config);
},
});
} else {
const config: ProcessSummaryTrackConfig = {
pidForColor,
upid,
utid,
};
ctx.registerTrack({
uri,
displayName: `${upid === null ? tid : pid} summary`,
kind: PROCESS_SUMMARY_TRACK,
tags: {
isDebuggable,
},
trackFactory: () => new ProcessSummaryTrack(ctx.engine, config),
});
}
}
}
private async addKernelThreadSummary(ctx: PluginContextTrace): Promise<void> {
const {engine} = ctx;
// Identify kernel threads if this is a linux system trace, and sufficient
// process information is available. Kernel threads are identified by being
// children of kthreadd (always pid 2).
// The query will return the kthreadd process row first, which must exist
// for any other kthreads to be returned by the query.
// TODO(rsavitski): figure out how to handle the idle process (swapper),
// which has pid 0 but appears as a distinct process (with its own comm) on
// each cpu. It'd make sense to exclude its thread state track, but still
// put process-scoped tracks in this group.
const result = await engine.query(`
select
t.utid, p.upid, (case p.pid when 2 then 1 else 0 end) isKthreadd
from
thread t
join process p using (upid)
left join process parent on (p.parent_upid = parent.upid)
join
(select true from metadata m
where (m.name = 'system_name' and m.str_value = 'Linux')
union
select 1 from (select true from sched limit 1))
where
p.pid = 2 or parent.pid = 2
order by isKthreadd desc
`);
const it = result.iter({
utid: NUM,
upid: NUM,
});
// Not applying kernel thread grouping.
if (!it.valid()) {
return;
}
const config: ProcessSummaryTrackConfig = {
pidForColor: 2,
upid: it.upid,
utid: it.utid,
};
ctx.registerTrack({
uri: 'perfetto.ProcessSummary#kernel',
displayName: `Kernel thread summary`,
kind: PROCESS_SUMMARY_TRACK,
trackFactory: () => new ProcessSummaryTrack(ctx.engine, config),
});
}
}
export const plugin: PluginDescriptor = {
pluginId: 'perfetto.ProcessSummary',
plugin: ProcessSummaryPlugin,
};
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