tp: allow the HTTP RPC accelerator to open more than 1 file by WangJialin547 · Pull Request #2615 · google/perfetto

WangJialin547 · 2025-08-19T03:36:44Z

Added a feature that solves the issue that at most one tab can be using the http + rpc accelerator.

Revised #2597 and made the change focused and minimal

LalitMaganti · 2025-08-19T09:13:53Z

So this is cool but definitely not sufficient for two reasons:

(big blocker) One important feature which works today is that if someone closes the laptop lid and then reopens, the websocket connection breaks but then the UI reconnects to the same TP instance transparently. That doesn't work anymore: if the lid is closed, you've forever lost the connection and this is a very poor user experience. It's actually a regression in the case of a single tab.
When the UI starts up it calls /status on trace processor to check whether the trace processor is being used and it pops up a dialog asking "trace processor is already being used, what do you want to do?". Right now, you've not changed any code on that path which means users will get a confusing dialog which no longer applies: you would need to change /status and the UI side to have some additional information about active connections

Landing this change requires with fixes for both 1) and 2).

LalitMaganti · 2025-08-20T09:27:03Z

I had a looked a the proposed fix and I'm reasonably sure it's not going to work if the lid is closed for a few hours (the laptop will wake up every now and again but likely will not connect within the timeout).

Sketching out how I expect a solution to work like:

when the websocket is created, the first message the UI sends is a new message indicating the UUID it wants to use for the trace processor associated with the websocket
rpc keeps a map from uuid -> trace processor and uses this to figure out what trace processor to use for connection. If no uuid is given (for back compat) it uses the "global" trace processor as it does today.
these trace processors are pruned after a long timeout (O(hours) without activity or number of messages etc). There should be an option to set the timeout from the command line
to solve problem 2, I said above, we need a new dialog in UI (with an expansion of the /status response) where the rpc provides all the trace processor instances in the UUID map and allows the user to pick which one they want to connect to (this handled both the case of timeouts, accidentally closing browser tab and also preloading the trace from command line and using that from the UI).

So TLDR the solution has to be significantly more complex than just changing the rpc layer: it will need changes to the UI as well: this is unavoidable.

@sashwinbalaji fyi.

WangJialin547 · 2025-08-27T05:37:29Z

@LalitMaganti @sashwinbalaji

both issues 1 and 2 have been addressed according to the instructions. this current modification allows the user to open multiple files using the trace processor as the backend establishes multiple trace processors according to the connections, and the "trace processor is already being used" modal is updated so the user can choose the desired file.

However there is a limitation that each trace processor remains limited to only one tab at a time. in order for a single trace processor to be accessible for multiple tabs i need to remove the rpc sequence mismatch check and update the restoreInitialTables so the TP doesn't clear tables when it restarts and both tabs can access their respctive tabes, but i'm not sure if that's allowed

LalitMaganti · 2025-08-27T08:35:45Z

However there is a limitation that each trace processor remains limited to only one tab at a time. in order for a single trace processor to be accessible for multiple tabs i need to remove the rpc sequence mismatch check and update the restoreInitialTables so the TP doesn't clear tables when it restarts and both tabs can access their respctive tabes, but i'm not sure if that's allowed

We definitely don't want to support that the same TP instance is accessible from multiple tabs at the same time. So we should keep the sequence checks and the restore initial state.

@sashwinbalaji will take care of reviewing this.

WangJialin547 · 2025-10-08T16:49:17Z

Hi @stevegolton , just checking in if you had the time to take a look at this PR. Appreciate it!

LalitMaganti · 2025-10-08T17:01:25Z

@sashwinbalaji can you PTAL at this?

LalitMaganti · 2025-10-08T17:03:27Z

@WangJialin547 @stevegolton is OOO this week. We'll follow up with him next week on this.

stevegolton · 2025-10-08T17:41:38Z

@sashwinbalaji I think Lalit just means can you just confirm the TP part - I'll look at the UI part.

I'm actually back tomorrow (returning early from vacation) so I can take a look at the UI part again either tomorrow or Friday.

Apologies for the late reply but there's a lot going on in the UI so unfortunately some things are taking precedence at the moment.

The unfortunate bit about this PR IIRC is that it touches and changes the logic of a core part of the UI codebase that was quite complex to begin with and it deserves more time than I've been able to give to it recently.

stevegolton

Thanks for making the changes - I added a few more comments.

In general I'm not super convinced about the way the rpc engine now needs a whole bunch more logic to obtain the traceProcessorId when requesting a new instance. It feels like the REST interface you have to look up the trace processor instances would be the ideal place where clients can request new instances - as it already acts as a higher level meta / management API on top of the low-level RPC websocket streaming API. Could we not add a POST endpoint here that allows us to create a new trace processor, returning the instance id, then we can just connect straight to it from the engine?

stevegolton · 2025-10-13T08:37:14Z

+  if (traceTitle) {
+    engine.sendTraceTitle(traceTitle);
+  }
+  return;


Nit: Unnecessary return

stevegolton · 2025-10-13T08:38:55Z

+      break;
+    case 'HTTP_RPC':
+      break;
+    default:


Nit: Can you add an assertUnreachable() here in the default statement please? That'll make sure at the typescript level that we cover all bases in the switch/case

E.g.

default: assertUnreachable(traceSource);

stevegolton · 2025-10-13T08:39:35Z

+  switch (traceSource.type) {
+    case 'FILE':
+      // Split on both \ and / (because C:\Windows\paths\are\like\this).
+      traceTitle = traceSource.file.name.split(/[/\\]/).pop()!;


Nit: It would be nice to dedupe this logic with above, but I'm not going to block on this.

stevegolton · 2025-10-13T08:43:36Z

@@ -220,6 +220,10 @@ async function loadTraceIntoEngine(
    engine,
  );

+  if (engine instanceof HttpRpcEngine) {


Using instanceof in a runtime conditional feels like a bit of a code smell. Can't we just set the trace title for all engines regardless?

Also what happens if we set the trace title for an HttpRpcEngine where a trace was already loaded by the user from the command line - i.e. when traceStream is undefined

stevegolton · 2025-10-13T09:05:08Z

@@ -34,43 +35,64 @@ export class HttpRpcEngine extends EngineBase {
  private disposed = false;
  private queue: Blob[] = [];
  private isProcessingQueue = false;
+  private traceProcessorId = 0;


Nit: This is always set in the constructor so there's no point in initializing it here as well.

stevegolton · 2025-10-13T09:06:11Z

    } else {
      this.requestQueue.push(data); // onWebsocketConnected() will flush this.
    }
  }

-  private onWebsocketConnected() {
+  onWebsocketConnected() {


Does this need to be public?

stevegolton · 2025-10-13T09:07:56Z

+    // again once the instance ID arrives.
+    if (this.isWaitingForid) return;
+
+    this.connected = true;


Did this line need to be moved?

stevegolton · 2025-10-13T09:10:46Z

+          this.fail(`${rpc.fatalError}`);
+        }
+        if (rpc.response !== TPM.TPM_GET_STATUS) {
+          this.fail(`Initial message missing instance ID: ${rpc}`);


Since this.fail throws, you could omit the else if logic below and just put everything in its own if condition. I was initially confused as the importance of the use of else but it doesn't look like it does anything.

WangJialin547 · 2025-10-20T19:52:20Z

Hi @stevegolton , thank for the feedback!

I am currently working on it but I wanted to make sure what is expected here before proceeding:

The Websocket implementation follows the design document sent by @primiano in this writeup which specifies to implement 2 different "/websocket" endpoints depending on whether you want to create or attach to a TP instance.

If the team has decided to change that to a POST endpoint I am happy to implement that change but I just like to confirm this is what the team wants to prevent another round of back and forth here.

stevegolton · 2025-10-22T08:23:52Z

Hi @stevegolton , thank for the feedback!

I am currently working on it but I wanted to make sure what is expected here before proceeding:

The Websocket implementation follows the design document sent by @primiano in this writeup which specifies to implement 2 different "/websocket" endpoints depending on whether you want to create or attach to a TP instance.

If the team has decided to change that to a POST endpoint I am happy to implement that change but I just like to confirm this is what the team wants to prevent another round of back and forth here.

Hey @WangJialin547, sorry for the inconsistency. We will discuss internally (today hopefully) and get back to you.

sashwinbalaji · 2025-10-22T18:53:14Z

First of all, huge apologies from our end for the delay and multiple back and forth. We did a post-mortem on how to avoid these kinds of issues on external contributions and have come up with a process to handle them (will share soon in a separate discussion).

So, coming to this CL, we concluded that the rpc_engine should not handle any logic. The UI dialog you have built is great.

For the backend, we'd like to go with a different approach, somewhat similar to your previous implementation change.

Keep /status and its updated protos (RpcStatus & StatusResult).
TP Selection:
- If a new one is requested, the UI should create a new UUID and connect to /websocket/<new_uuid>
- If an active TP is selected the UI should connect to its uuid as /websocket/<old_uuid>.
The RPC layer should then keep a map from the UUID to the trace processor and use this to figure out which trace processor to use for the connection and if it’s an unknown one create a new TP instance.
If no uuid is given (for back compat) it uses the "global" trace processor as it does today.

Please keep the deletion/cleanup logic.

Once again, thank you for your responsiveness and your contribution.

sashwinbalaji · 2025-11-14T16:46:25Z

Hi @WangJialin547,

Are you still actively working on this? As you know this is a critical core feature, we are very eager to land it soon.

If you're busy, we're happy to take this over the finish line, making sure you get full credit for your significant contributions in the commit history.

Please let us know your preference. Thanks again for all your hard work on this PR.

WangJialin547 · 2025-11-15T00:25:52Z

@sashwinbalaji

Hi there, thanks for checking in. I indeed am still actively working on this and my preference is that I still want to finish this PR myself.

Right now I’m in the middle of an unusually heavy academic period in college, with two major exams and multiple important deadlines next week (11/17 - 11/23), but I will be able to start making meaningful commits after that.

If the project’s timeline can accommodate the delay, I’d really appreciate the chance to complete the remaining changes myself. If waiting causes issues, I understand, but my strong preference is to continue owning the PR.

Thank you again for your patience and understanding, and I will start working on this as soon as time allows.

sashwinbalaji · 2025-11-17T13:29:12Z

Sure, take your time and please ensure it aligns with #2615 (comment). We are always happy to have external contributions.

WangJialin547 · 2025-11-27T07:05:31Z

Hi @sashwinbalaji ,

Here's what I have made so far. I have addressed the issues stated in #2615 (comment) , including replacing the integer instaceID to UUID and moved the UUID generation logic from the backend to the UI.

I have 2 questions regarding how to move forward:

trace_processor_shell.cc allows the user to load a trace file in the command line; should I load it into the global rpc, or load it into a separate thread instead?

In my current implementation, for backward comp I loaded it into the "global" rpc as requested in the comment since it doesn't have an associated UUID. However, due to the strcture of /status protos, this means that it can't:
a. display when it's last accessed;
b. stop the user from opening it again in another tab if it's attached to an active tab already, which causes the old multitab sequence ID broken issue;
c. be closed via the /close HTTP endpoint like the tps running on an RpcThread.

Should I leave it like this or implement some modifications?

I was away for a few weeks due to college and after I returned, I pulled everything new from the upstream branch, I resolved merge conflicts and updated neccessary things accordingly but met some presubmit errors regarding some modifications in Chromium while I didn't change anything. what should I do to resolve this?

--- Presubmit Errors Found ---

Files under src/trace_processor/perfetto_sql/stdlib/chrome/, test/data/chrome/, test/trace_processor/diff_tests/stdlib/chrome/ are rolled from the Chromium repository by a Copybara service.
You should not modify these in the Perfetto repository, please make your changes in Chromium instead.
Affected files:
- src/trace_processor/perfetto_sql/stdlib/chrome/OWNERS.github
- src/trace_processor/perfetto_sql/stdlib/chrome/chrome_scrolls.sql
- src/trace_processor/perfetto_sql/stdlib/chrome/event_latency.sql
- src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/scroll_jank_intervals.sql
- src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/scroll_jank_v3.sql
- src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/utils.sql
- src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank_tagging.sql
- test/trace_processor/diff_tests/stdlib/chrome/OWNERS.github
  If you want to do a manual roll, you must specify CHROME_STDLIB_MANUAL_ROLL= in the CL description/commit message.

Thank you again for your time. (I know there are still some undeleted comments in the source files, I will take care of them ASAP once I know the directions to resolve these issues)

sashwinbalaji · 2025-12-02T10:26:03Z

Thanks for picking up the task back.

trace_processor_shell.cc allows the user to load a trace file in the command line; should I load it into the global rpc, or load it into a separate thread instead?
In my current implementation, for backward comp I loaded it into the "global" rpc as requested in the comment since it doesn't have an associated UUID. However, due to the strcture of /status protos, this means that it can't:
a. display when it's last accessed;
b. stop the user from opening it again in another tab if it's attached to an active tab already, which causes the old multitab sequence ID broken issue;
c. be closed via the /close HTTP endpoint like the tps running on an RpcThread.
Should I leave it like this or implement some modifications?

Please load it into a separate thread. You can update RunHttpRPCServer to take a preloaded tp instance and plumb it to RpcThread. RunHttpRPCServer can also handle the uuid creation and updating the map as needed.

I was away for a few weeks due to college and after I returned, I pulled everything new from the upstream branch, I resolved merge conflicts and updated neccessary things accordingly but met some presubmit errors regarding some modifications in Chromium while I didn't change anything. what should I do to resolve this?
--- Presubmit Errors Found ---

Files under src/trace_processor/perfetto_sql/stdlib/chrome/, test/data/chrome/, test/trace_processor/diff_tests/stdlib/chrome/ are rolled from the Chromium repository by a Copybara service.
You should not modify these in the Perfetto repository, please make your changes in Chromium instead.
Affected files:
src/trace_processor/perfetto_sql/stdlib/chrome/OWNERS.github
src/trace_processor/perfetto_sql/stdlib/chrome/chrome_scrolls.sql
src/trace_processor/perfetto_sql/stdlib/chrome/event_latency.sql
src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/scroll_jank_intervals.sql
src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/scroll_jank_v3.sql
src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank/utils.sql
src/trace_processor/perfetto_sql/stdlib/chrome/scroll_jank_tagging.sql
test/trace_processor/diff_tests/stdlib/chrome/OWNERS.github
If you want to do a manual roll, you must specify CHROME_STDLIB_MANUAL_ROLL= in the CL description/commit message.

try to manually revert these changes by running : git checkout origin/main -- file...

Do ping us when the CL is in a state for review, thanks.

…tions

WangJialin547 · 2025-12-17T22:32:17Z

@sashwinbalaji

Hi, I have addressed the comments and incorporated the requested changes. Some explanations to specific design choices:

(main concern) As requested, the preloaded TP from trace_processor_shell.cc is loaded in a separate thread now. One earlier comment requests /websocket connections without any uuid to be mapped to the global rpc in the main thread. I realized that doing so will cause back comp issues as now the global rpc will be empty and the older ui does not know how access the preloaded trace in another thread. To avoid such issue I changed the legacy /websocket a bit to use the thread with the prealoaded trace instead. Please let me know you prefer a different approach.
I realized that the new /websocket endpoints design does not distinguish disconnection due to closing laptop lid or intentional disonnection via the /close HTTP endpoint. As such I added a set that contains the uuids of all the intentionally closed TPs. When the ui attempts to reconnect such connection, the backend will refuse to reconnect with a 410 Gone.

Also, apologies for the slow update, it was finals week at my college so I didn't have the time to update this PR. I am back to normal now because school is over and I'm open to any further revisions.

LalitMaganti · 2025-12-23T00:27:38Z

@WangJialin547 thank you for getting back to this patch. Most of the team (including @sashwinbalaji) have left for the Chrismas break so we will get back to reviewing this patch in the new year. Thanks again for your continued contribution and patience.

sashwinbalaji

Thanks for your continued work on this.

Added some initial comments for now. To test it more please rebase your change and resolve the conflicts can be verified further.

sashwinbalaji · 2026-01-07T10:57:35Z

-  // trace_processor_shell -D trace_file.pftrace .
+  // If present and not empty, a trace is already loaded already in one or more
+  // trace processors. This happens when using the HTTP+RPC mode and passing a
+  // trace file to the shell, via trace_processor_shell -D trace_file.pftrace .


nit: remove the .

sashwinbalaji · 2026-01-07T10:58:37Z

+  optional uint32 instance_id = 5;
+  optional uint64 inactivity_ns = 6;
+  optional bool is_attached = 7;
+  optional string instance_uuid = 8;


please add some description comments.

sashwinbalaji · 2026-01-07T11:05:19Z

  std::string metric_v1_names;
  std::string metric_v1_output;
  std::vector<std::string> raw_metric_v1_extensions;
+  size_t tp_timeout_mins = 24 * 60;  // 24 hours


please use uint32_t

sashwinbalaji · 2026-01-07T11:12:19Z

    RunHttpRPCServer(
-        /*rpc=*/rpc,
+        /*preloaded_tp=*/rpc.TakeTraceProcessor(),
+        /*is_preloaded_eof-*/ !options.trace_file_path.empty(),


instead of 2 separate params (preloading tp and is_preloaded_eof) how about just continuing with passing rpc and exposing a getter in rpc to get eof_ ?

sashwinbalaji · 2026-01-07T11:20:03Z


  // New endpoint, returns data in batches using chunked transfer encoding.
-  // The batch size is determined by |cells_per_batch_| and
+  // The batch size is determined by |cells_per_batch_|


add it back ?

sashwinbalaji · 2026-01-07T13:13:12Z

+      closed_conn_ids_;  // if you don't keep a list of the UUIDs of closed
+                         // connections, the frontend will confuse it with
+                         // closing the laptop lid and try to reopen them,
+                         // causing a new thread to be reopened immediately.
+                         // when you make a new websocket handshake, check this
+                         // set to see if it was previously closed, and if so,
+                         // refuse to reopen it.


comment styling refer to others in the file.

sashwinbalaji · 2026-01-07T13:14:07Z

+        if (closed_conn_ids_.find(instance_uuid) != closed_conn_ids_.end()) {
+          PERFETTO_ILOG("Refusing to reopen previously closed TP instance %s",
+                        instance_uuid.c_str());
+          return conn.SendResponseAndClose("410 Gone", {});


better response msg.

sashwinbalaji · 2026-01-07T13:15:55Z

+void Httpd::OnHttpConnectionClosed(base::HttpServerConnection* conn) {
+  std::lock_guard<std::mutex> lock(websocket_rpc_mutex_);
+  auto conn_to_id_it = conn_to_id_map.find(conn);
+  if (conn_to_id_it != conn_to_id_map.end()) {


use early returns to reduce some nesting

sashwinbalaji · 2026-01-07T13:26:15Z

  // without warning.
  optional string version_code = 4;
+
+  optional uint32 instance_id = 5;


instance_id is not used, i prefer keeping it rather than introducing a string instance_uuid

sashwinbalaji · 2026-01-07T13:32:31Z

+        std::string tp_uuid = entry.first;
+        const auto& tp_rpc = entry.second;


can we name the variable tp_rpc better please, maybe tp_rpc_thread as tp_rpc->rpc_ is confusing and also you can use structure bindings to fetch them both

LalitMaganti · 2026-02-12T20:23:01Z

@WangJialin547 how is it going? What's the status of this PR? Are you still interested in completing it?

sashwinbalaji · 2026-04-28T10:43:17Z

Hi @WangJialin547

Catching up to see, if you are working on this PR ? If not, I can take it over and ensure you get the authorship for the change.

WangJialin547 · 2026-05-07T03:48:52Z

Hi @sashwinbalaji , thanks for checking in.

I’ve spent quite a bit of time working on this PR, but I’m currently too busy to finish it properly, so I think it would be the best if you take over.

I really appreciate you offering to preserve my authorship for the change. I’m happy to share any notes to ensure smoother handoff, if needed. Thanks again!

feat: allow multiple tabs to use the HTTP RPC accelerator

3b0ad6a

WangJialin547 requested a review from a team as a code owner August 19, 2025 03:36

WangJialin547 changed the title ~~feat: allow multiple tabs to use the HTTP RPC accelerator~~ tp: allow multiple tabs to use the HTTP RPC accelerator Aug 19, 2025

attempt to solve problem 1

7fc623c

WangJialin547 force-pushed the main branch from cd79cdf to 7fc623c Compare August 20, 2025 04:16

WangJialin547 added 3 commits August 23, 2025 12:30

attempt to solve problem 1

b8b0964

added thread pruning mechanic

2847b92

Merge branch 'problem1'

589f7fd

LalitMaganti requested a review from sashwinbalaji August 23, 2025 11:39

WangJialin547 added 10 commits August 25, 2025 12:05

temp save

ce0ae70

changed proto, added modal

55511f0

temp save

4c6ad28

format code

c63b538

fix modal 2

c455bb4

solved problem 2

2a30a36

format files

f91b34e

fixed missing file name bug

b14364f

added missing message handling

9d19600

fixed segfault issue

13bfbdf

update comments

d7ba3d5

WangJialin547 changed the title ~~tp: allow multiple tabs to use the HTTP RPC accelerator~~ tp: allow the HTTP RPC accelerator to open more than 1 file Aug 27, 2025

sashwinbalaji requested changes Aug 27, 2025

View reviewed changes

WangJialin547 added 4 commits August 28, 2025 20:09

fix typo

38a32b5

remove unneccessary timeout_mins parameter

e822bda

changed UuidRpcThread to a class

f479da7

renamed IsUuidHandshake function to PascalCase

fab1acc

WangJialin547 requested a review from stevegolton October 8, 2025 16:49

stevegolton requested changes Oct 13, 2025

View reviewed changes

WangJialin547 added 7 commits November 26, 2025 14:57

changed integer instance IDs to string UUIDs

8313745

format code

057a2be

attempt to address back comp issues

e6b97ed

Merge remote-tracking branch 'upstream/main'

e52992e

pulled recent additions and made changes accordingly

cce0452

bug fix

3336585

fix presubmit issues

f7623b2

WangJialin547 added 3 commits December 17, 2025 00:02

loaded the trace_processor_shell instance onto a separate thread

a70bf6e

solved autoreconnection issue by keep track of uuids of closed connec…

711fa11

…tions

fixed backcomp issues

d885b99

sashwinbalaji requested changes Jan 7, 2026

View reviewed changes

		std::string tp_uuid = entry.first;
		const auto& tp_rpc = entry.second;

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