### Features
We can now write tailing memory to a utrace file. Snapshotting while tracing to a file or socket is supported.
This change introduces a new console command: Trace.SnapshotFile. It writes the profiling data from memory into an optionally specified a utrace file.
### Testing
Run Editor with -tracefile
Run Editor with -trace, connect live with insights
Run Editor without -trace (this does generate a very small utrace since there is memory and data in the tail even though default channels are not enabled)
#rb johan.berg
#jira UE-150302,UE-150292
#preflight 6272a3213e1f2a9d3a88ee3d
#ROBOMERGE-OWNER: geoff.evans
#ROBOMERGE-AUTHOR: geoff.evans
#ROBOMERGE-SOURCE: CL 20124258 via CL 20125717 via CL 20126082
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v943-19904690)
[CL 20129506 by geoff evans in ue5-main branch]
### Features
This change enables the StallDetector watchdog in Editor to submit reports to crashreporter about threads violating instrumented deadlines in the source code. This feature was available prior on Windows, and this change adds Linux support.
### Notes
New APIs:
ReportStall()
CaptureThreadPortableCallStack()
Many APIs are updated from purely "Ensure" naming to more general naming. Stalls are more like Ensures than crashes, and so the appropriate renames to make the code readable and clear have been made. In some places Ensure is replaced with the clearer: Continuable Event nomenclature.
### Testing
I synthesized an ensure on Linux, and did the same for a stall. I then compared crash report XML file to make sure they contain accurate data in the callstack, portable callstack, and other fields in the report. I also noted that the stall information was showing as expected in the crash reporter.
#rb brandon.schaefer, francis.hurteau
#jira UETOOL-3336
#preflight 625e20d2804460ab0fea3277
[CL 19911608 by geoff evans in ue5-main branch]
First one because due to RTC in EOS not having frame pointers causing a crash when walking down the stack. Limiting callstack tracing with a scope.
The second one because of limited stack size (4k) in a Curl Helper thread, causing a crash when walking down the stack because the callstack walker was allocating 4k on the stack. Doing it inplace to allocate only 2k.
[REVIEW] [at]johan.berg
[FYI] pavel.punsky
#rnx
#ROBOMERGE-OWNER: john.huelin
#ROBOMERGE-AUTHOR: john.huelin
#ROBOMERGE-SOURCE: CL 19739450 via CL 19739526 via CL 19739543 via CL 19739742 via CL 19739765
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v938-19570697)
[CL 19741582 by john huelin in ue5-main branch]
Manual memory tracking in LLM has a feature for defining a "fallback tag" for the allocation if no tag is currently set. This change adds a new scope type which allows us to express this behaviour in memory tracing as well.
#jira UE-142692
#rb ionut.matasaru
#preflight 624ed4e9bd5b36eec338a937
[CL 19667413 by Johan Berg in ue5-main branch]
Clear caches and update a canary value across the fork boundary to avoid touching pages that were allocated pre-fork to minimize unnecessary duplication of shared pages.
Savings depend on pre-fork fragmentation/slack and number of concurrent child processes.
#rb louisphilippe.seguin, johan.torp, arciel.rekman
#ROBOMERGE-OWNER: robert.millar
#ROBOMERGE-AUTHOR: robert.millar
#ROBOMERGE-SOURCE: CL 19057122 via CL 19057644 via CL 19057693 via CL 19057718 via CL 19057737 via CL 19059617
#ROBOMERGE-BOT: UE5 (Release-Engine-Staging -> Main) (v918-19018356)
[CL 19066314 by robert millar in ue5-main branch]
Details: removes duplicate checks on CpuChannel by resolving SpecIds inside the scope event structure and avoiding passing in CpuChannel as the fine-grained channel when we always check CpuChannel at least.
#rb jordan.cristiano
#ROBOMERGE-AUTHOR: evgenii.babinets
#ROBOMERGE-SOURCE: CL 19003995 via CL 19004354 via CL 19005197 via CL 19008129 via CL 19008734
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v917-18934589)
[CL 19008810 by evgenii babinets in ue5-main branch]
* An extra '&' token was removed on the type alias in the no logging case.
* In the case where trace is enabled, but logging is disabled, made a identical solution in TraceAuxImpl.
#rb ionut.matasaru
#jira UE-139439, UE-139433, UE-139444
#preflight 61e80742843acf1b2429961b
#ROBOMERGE-AUTHOR: johan.berg
#ROBOMERGE-SOURCE: CL 18657057 in //UE5/Release-5.0/... via CL 18657068 via CL 18657070
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v900-18638592)
[CL 18657072 by johan berg in ue5-main branch]
In order to be able to output detailed error and status messages to both core log or console feedback log depending on situation, add argument to set the target category. Also removed now redundant logs in console commands, since more detailed information is now emitted on the console feedback.
#preflight 61e56f34873f2ea48f23d007
#ROBOMERGE-OWNER: johan.berg
#ROBOMERGE-AUTHOR: johan.berg
#ROBOMERGE-SOURCE: CL 18632544 in //UE5/Release-5.0/... via CL 18633016 via CL 18633031
#ROBOMERGE-BOT: UE5 (Release-Engine-Test -> Main) (v899-18417669)
#ROBOMERGE-CONFLICT from-shelf
[CL 18637343 by johan berg in ue5-main branch]
We need to set this define in other platform build files, and since some of them are included on windows (editor) builds as well, we can end up with warnings of redefinition of variable.
#preflight 61e025e11e7c2075bb218b0f
#ROBOMERGE-AUTHOR: johan.berg
#ROBOMERGE-SOURCE: CL 18595866 in //UE5/Release-5.0/... via CL 18595880 via CL 18595890
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Test -> Main) (v899-18417669)
[CL 18596773 by johan berg in ue5-main branch]
#preflight 61e01e2e1e7c2075bb207de7
#ROBOMERGE-AUTHOR: johan.berg
#ROBOMERGE-SOURCE: CL 18595647 in //UE5/Release-5.0/... via CL 18595651 via CL 18595655
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Test -> Main) (v899-18417669)
[CL 18596721 by johan berg in ue5-main branch]
Refactor csvExecCmds to move the initialization logic into the CSV profiler itself. The execution still needs to happen in the engine, but this is now done during normal frame processing.
Fix a bug when processing csv execcmds with colons, e.g file paths
#ROBOMERGE-OWNER: ben.woodhouse
#ROBOMERGE-AUTHOR: ben.woodhouse
#ROBOMERGE-SOURCE: CL 18442929 via CL 18442943 via CL 18442951 via CL 18445402 via CL 18445577 via CL 18445604
#ROBOMERGE-BOT: STARSHIP (Release-Engine-Test -> Main) (v897-18405271)
[CL 18447887 by ben woodhouse in ue5-main branch]
