8267532: C2: Profile and prune untaken exception handlers #16416

JornVernee · 2023-10-30T14:10:33Z

The issue is essentially that for the Java try-with-resource construct, javac generates multiple calls to close() the resource. One of those calls is inside the hidden exception handler of the try block. The issue for us is that typically the exception handler is never entered (since no exception is thrown), however we don't profile exception handlers at the moment, so the block is not pruned. C2 doesn't inline the close() call in the handler due to low call site frequency. As a result, the receiver of that call escapes and can not be scalar replaced, which then leads to a loss in performance.

There has been some discussion on the JBS issue that this could be fixed by profiling catch blocks. And another suggestion that partial escape analysis could help here to prevent the object from escaping. But, I think there are other benefits to being able to prune dead catch blocks, such as general reduction in code size, and other optimizations being possible by dead code being eliminated. So, I've implemented catch block profiling + pruning in this patch.

The implementation is essentially very straightforward: we allocate an extra bit of profiling data for each
exception handler of a method in the MethodData for that method (which holds all the profiling
data). Then when looking up the exception handler after an exception is thrown, we mark the
exception handler as entered. When C2 parses the exception handler block, and it sees that it has
never been entered, we emit an uncommon trap instead.

I've also cleaned up the handling of profiling data sections a bit. After adding the extra section of data to MethodData, I was seeing several crashes when ciMethodData was used. The underlying issue seemed to be that the offset of the parameter data was computed based on the total data size - parameter data size (which doesn't work if we add an additional section for exception handler data). I've re-written the code around this a bit to try and prevent issues in the future. Both MethodData and ciMethodData now track offsets of parameter data and exception handler data, and the size of the each data section is derived from the offsets.

Finally, there was an assert firing in freeze_internal in continuationFreezeThaw.cpp:

assert(monitors_on_stack(current) == ((current->held_monitor_count() - current->jni_monitor_count()) > 0),
     "Held monitor count and locks on stack invariant: " INT64_FORMAT " JNI: " INT64_FORMAT, (int64_t)current->held_monitor_count(), (int64_t)current->jni_monitor_count());

This assert relies on has_monitors being set for a method, which in itself relies on monitorenter and monitorexit being parsed. However, if we prune untaken exception handlers, we might not see any monitorexit, which is a problem for OSR compilations since then we might also not see any monitorenter. After some investigation, it turns out that ciMethod already tracks whether monitor bytecodes are being used, so we can just piggyback on that instead of relying on monitorenter or monitorexit being parsed. We can follow the existing pattern for how has_reserved_stack_access is being tracked (which I've done). See a484206 a33a905 and d727df7

Benchmark with -XX:-PruneDeadExceptionHandlers:

Benchmark                                                      Mode  Cnt      Score     Error   Units
ResourceScopeCloseMin.confined_close                           avgt   30     10.458 ±   0.070   ns/op
ResourceScopeCloseMin.confined_close:gc.alloc.rate             avgt   30   9480.988 ±  63.335  MB/sec
ResourceScopeCloseMin.confined_close:gc.alloc.rate.norm        avgt   30    104.000 ±   0.001    B/op
ResourceScopeCloseMin.confined_close:gc.count                  avgt   30    119.000            counts
ResourceScopeCloseMin.confined_close:gc.time                   avgt   30     94.000                ms
ResourceScopeCloseMin.confined_close_notry                     avgt   30      4.691 ±   0.063   ns/op
ResourceScopeCloseMin.confined_close_notry:gc.alloc.rate       avgt   30  11383.693 ± 151.145  MB/sec
ResourceScopeCloseMin.confined_close_notry:gc.alloc.rate.norm  avgt   30     56.000 ±   0.001    B/op
ResourceScopeCloseMin.confined_close_notry:gc.count            avgt   30    120.000            counts
ResourceScopeCloseMin.confined_close_notry:gc.time             avgt   30    104.000                ms

with -XX:+PruneDeadExceptionHandlers:

Benchmark                                                      Mode  Cnt      Score     Error   Units
ResourceScopeCloseMin.confined_close                           avgt   30      4.563 ±   0.043   ns/op
ResourceScopeCloseMin.confined_close:gc.alloc.rate             avgt   30  11702.868 ± 108.816  MB/sec
ResourceScopeCloseMin.confined_close:gc.alloc.rate.norm        avgt   30     56.000 ±   0.001    B/op
ResourceScopeCloseMin.confined_close:gc.count                  avgt   30    121.000            counts
ResourceScopeCloseMin.confined_close:gc.time                   avgt   30     93.000                ms
ResourceScopeCloseMin.confined_close_notry                     avgt   30      4.601 ±   0.054   ns/op
ResourceScopeCloseMin.confined_close_notry:gc.alloc.rate       avgt   30  11605.391 ± 134.000  MB/sec
ResourceScopeCloseMin.confined_close_notry:gc.alloc.rate.norm  avgt   30     56.000 ±   0.001    B/op
ResourceScopeCloseMin.confined_close_notry:gc.count            avgt   30    121.000            counts
ResourceScopeCloseMin.confined_close_notry:gc.time             avgt   30    101.000                ms

Note that with the optimization turned on, timing and gc.alloc.rate.norm is ~equal.

I also noticed through other experiments that C2's ability to inline improves, due to inline_instructions_size being reduced for methods with untaken exception handlers, which might bring the size under InlineSmallCode, and allow the method to be inlined again.

Finally, I've changed all the foreign benchmarks to use try-with-resources where they were working around this issue, and verified that allocations go down when turning on the optimization.

Testing : tier 1-6. Local run of hotspot_compiler suite with -XX:+DeoptimizeALot and with -XX:+StressPrunedExceptionHandlers.

Special thanks to Tobias Hartmann, and Vladimir Ivanov for the discussion during the design process of this patch.

Progress

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Issues

JDK-8267532: C2: Profile and prune untaken exception handlers (Enhancement - P3)
JDK-8310011: Arena with try-with-resources is slower than it should be (Bug - P3)

Reviewers

Tobias Hartmann (@TobiHartmann - Reviewer) ⚠️ Review applies to 3ad93fdd
Vladimir Ivanov (@iwanowww - Reviewer) ⚠️ Review applies to 46c94342

Reviewing

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bridgekeeper · 2023-10-30T14:12:00Z

👋 Welcome back jvernee! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2023-10-30T14:12:48Z

@JornVernee The following labels will be automatically applied to this pull request:

core-libs
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When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing lists. If you would like to change these labels, use the /label pull request command.

JornVernee · 2023-10-30T15:31:41Z

/label remove core-libs

openjdk · 2023-10-30T15:33:14Z

@JornVernee
The core-libs label was successfully removed.

…l/stress/PinALot.java#id1 fails

This reverts commit e223d95.

iwanowww · 2023-11-15T18:03:02Z

The issue occurs for OSR compilations where the monitorenter is before the loop (outside of the compiled code) ...

Thanks for the clarifications.

Spotted another inconsistency: C1 doesn't set has_monitor on monitorexit while C2 does. So, seems like C1 is also affected (even without branch pruning).

Please, file a separate bug for it. The code in question is used in verification code and available only in debug VM. If the failures block this patch, you can comment out relevant asserts. They'll be re-enabled as part of the proper fix.

dean-long · 2023-11-15T21:08:23Z

Spotted another inconsistency: C1 doesn't set has_monitor on monitorexit while C2 does. So, seems like C1 is also affected (even without branch pruning).

Is it possible for C1 to see a monitorexit but not the earlier monitorenter?

iwanowww · 2023-11-15T22:25:42Z

Is it possible for C1 to see a monitorexit but not the earlier monitorenter?

Hm, good question, Dean. I was under impression that there are no guarantees C1 visits all reachable bytecodes of a method during parsing, so monitorenter can be missed. But after reexamining GraphBuilder implementation I don't think it is possible.

dean-long · 2023-11-15T22:43:19Z

I had a similar concern and also convinced myself it's not a problem for C1. If it was, we should have seen an assert in the loom code that depends on has_monitor().

JornVernee · 2023-11-16T20:53:39Z

Please, file an RFE to explore pruning of unreached call sites.

Filed: https://bugs.openjdk.org/browse/JDK-8320271

JornVernee · 2023-11-17T12:15:57Z

I've removed the fix for the has_monitors issue 1 and filed: https://bugs.openjdk.org/browse/JDK-8320310

I've also added checks using too_many_traps as suggested 2

P.S. it looks like the too_many_traps check was too strong, as it will return true if there are too many traps with the same deopt reason anywhere in the compiled nmethod. I've removed it again for now.

This reverts commit bee0553.

JornVernee · 2023-11-17T15:43:39Z

Missing profiling would be bad, as in that case we'd always try to prune the exception handler. i.e. it's not just a missed optimization.

Yes, pathological recompilation is another scenario to consider. You can sprinkle Compile::too_many_traps checks (both as asserts and product checks) to ensure profiling information is up-to-date.

I also realize that what I said here is not quite true, as we mark the handler as entered in the deopt code. So, if we deopt once, we won't get an uncommon trap again. (there's a test case for that as well).

iwanowww

Overall, looks very good.

I have been thinking about the following choices made in this PR:

amount of profiling data: binary (seen vs not seen) vs integral (branch count)
deoptimization action: reinterpret vs made_not_entrant
place where uncommon trap is inserted (Parse vs ciTypeFlow)

I haven't come with strong arguments to change any of these choices, so I'm the patch as it is now. We can adjust them later as follow-up enhancements if we decide to do so.

On naming: ex_handler is used only once - GraphKit::has_ex_handler(). Everywhere else in the code base exception_handler is used. Please, align the naming. Feel free to adjust GraphKit::has_ex_handler().

The tests are very nice! Can you, please, point me to the test case which covers profiling in interpreter?

JornVernee · 2023-11-23T15:28:03Z

On naming: ex_handler is used only once - GraphKit::has_ex_handler(). Everywhere else in the code base exception_handler is used. Please, align the naming. Feel free to adjust GraphKit::has_ex_handler().

Done.

The tests are very nice! Can you, please, point me to the test case which covers profiling in interpreter?

I've added 2 more test cases that target interpreter profiling specifically. See: dfd5da1

JornVernee · 2023-11-27T10:01:25Z

Another round of tier 1 - 8 testing came back clean. I'm planning to integrate the patch tomorrow.

JornVernee · 2023-11-28T10:16:44Z

/integrate

openjdk · 2023-11-28T10:18:02Z

Going to push as commit a5ccd3b.
Since your change was applied there have been 120 commits pushed to the master branch:

464dc3d: 8319633: runtime/posixSig/TestPosixSig.java intermittent timeouts on UNIX
efc3922: 8319048: Monitor deflation unlink phase prolongs time to safepoint
debf0ec: 8313355: javax/management/remote/mandatory/notif/ListenerScaleTest.java failed with "Exception: Failed: ratio=792.2791601423487"
20aae3c: 8320533: Adjust capstone integration for v6 changes
0678253: 8320602: Lock contention in SchemaDVFactory.getInstance()
f1a24f6: 8318599: HttpURLConnection cache issues leading to crashes in JGSS w/ native GSS introduced by 8303809
7848ed7: 8301856: Generated .spec file for RPM installers uninstalls desktop launcher on update
726f854: 8320706: RuntimePackageTest.testUsrInstallDir test fails on Linux
1bb250c: 8261837: SIGSEGV in ciVirtualCallTypeData::translate_from
5f7f2c4: 8320249: tools/jpackage/share/AddLauncherTest.java#id1 fails intermittently on Windows in verifyDescription
... and 110 more: https://git.openjdk.org/jdk/compare/8ec6b8de3bb3d7aeebdcb45d761b18cce3bab75e...master

Your commit was automatically rebased without conflicts.

openjdk · 2023-11-28T10:18:11Z

@JornVernee Pushed as commit a5ccd3b.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

mlbridge · 2023-12-01T04:21:55Z

Mailing list message from Vitaly Provodin on hotspot-dev:

Hi all,

With the latest changes I got the following error

=======================8<----------------------
./src/hotspot/share/ci/ciMethodData.cpp:477:1: error: non-void function does not return a value in all control paths [-Werror,-Wreturn-type]
}
^
1 error generated.
make[3]: *** [/opt/teamcity-agent/work/602288ed8ca22f30/build/macosx-aarch64-server-release/hotspot/variant-server/libjvm/objs/ciMethodData.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [hotspot-server-libs] Error 2
make[2]: *** Waiting for unfinished jobs?.
=======================8<???????????

Here is my build environment

Configuration summary:
* Name: macosx-aarch64-server-release
* Debug level: release
* HS debug level: product
* JVM variants: server
* JVM features: server: 'cds compiler1 compiler2 dtrace epsilongc g1gc jfr jni-check jvmci jvmti management parallelgc serialgc services shenandoahgc vm-structs zgc'
* OpenJDK target: OS: macosx, CPU architecture: aarch64, address length: 64
* Version string: 22+9-b1917 (22)
* Source date: 1701334649 (2023-11-30T08:57:29Z)

Tools summary:
* Boot JDK: openjdk version "22" 2024-03-19 OpenJDK Runtime Environment JBR-22+9-1795-nomod (build 22+9-b1795) OpenJDK 64-Bit Server VM JBR-22+9-1795-nomod (build 22+9-b1795, mixed mode)
* Toolchain: clang (clang/LLVM from Xcode 12.2)
* Sysroot: /Applications/Xcode_12.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk
* C Compiler: Version 12.0.0 (at /usr/bin/clang)
* C++ Compiler: Version 12.0.0 (at /usr/bin/clang++)

Could you please clarify how to overcome this issue?

Thanks,
Vitaly

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mlbridge · 2023-12-01T04:21:57Z

Mailing list message from Vladimir Kozlov on hotspot-dev:

I hit is too on my Mac, I filed following bug and assigned to Jorn.

https://bugs.openjdk.org/browse/JDK-8321141

Note, I checked and all testing passed when 8267532 was reviewed.
May be something to do with old Xcode I used to compile or something else.

Thanks,
Vladimir K

On 11/30/23 4:47 AM, Vitaly Provodin wrote:

Hi all,

With the latest changes I got the following error

=======================8<----------------------
./src/hotspot/share/ci/ciMethodData.cpp:477:1: error: non-void function does not return a value in all control paths
[-Werror,-Wreturn-type]
}
^
1 error generated.
make[3]: ***
[/opt/teamcity-agent/work/602288ed8ca22f30/build/macosx-aarch64-server-release/hotspot/variant-server/libjvm/objs/ciMethodData.o] Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [hotspot-server-libs] Error 2
make[2]: *** Waiting for unfinished jobs?.
=======================8<???????????

Here is my build environment

Configuration summary:
* Name: macosx-aarch64-server-release
* Debug level: release
* HS debug level: product
* JVM variants: server
* JVM features: server: 'cds compiler1 compiler2 dtrace epsilongc g1gc jfr jni-check jvmci jvmti management parallelgc
serialgc services shenandoahgc vm-structs zgc'
* OpenJDK target: OS: macosx, CPU architecture: aarch64, address length: 64
* Version string: 22+9-b1917 (22)
* Source date: 1701334649 (2023-11-30T08:57:29Z)

Tools summary:
* Boot JDK: openjdk version "22" 2024-03-19 OpenJDK Runtime Environment JBR-22+9-1795-nomod (build 22+9-b1795) OpenJDK
64-Bit Server VM JBR-22+9-1795-nomod (build 22+9-b1795, mixed mode)
* Toolchain: clang (clang/LLVM from Xcode 12.2)
* Sysroot: /Applications/Xcode_12.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk
* C Compiler: Version 12.0.0 (at /usr/bin/clang)
* C++ Compiler: Version 12.0.0 (at /usr/bin/clang++)

Could you please clarify how to overcome this issue?

Thanks,
Vitaly

mlbridge · 2023-12-01T04:21:59Z

Mailing list message from Jorn Vernee on hotspot-dev:

Hello,

It seems to be an issue with XCode 12.2 not supporting the [[noreturn]]
attribute. Note that the build guide recommends at least XCode 14 [1],
so you may want to upgrade XCode to see if that helps.

Jorn

[1]: https://github.com/openjdk/jdk/blob/master/doc/building.md#macos

On 30/11/2023 19:48, Vladimir Kozlov wrote:

I hit is too on my Mac, I filed following bug and assigned to Jorn.

https://bugs.openjdk.org/browse/JDK-8321141

Note, I checked and all testing passed when 8267532 was reviewed.
May be something to do with old Xcode I used to compile or something
else.

Thanks,
Vladimir K

On 11/30/23 4:47 AM, Vitaly Provodin wrote:

Hi all,

With the latest changes I got the following error

=======================8<----------------------
./src/hotspot/share/ci/ciMethodData.cpp:477:1: error: non-void
function does not return a value in all control paths
[-Werror,-Wreturn-type]
}
^
1 error generated.
make[3]: ***
[/opt/teamcity-agent/work/602288ed8ca22f30/build/macosx-aarch64-server-release/hotspot/variant-server/libjvm/objs/ciMethodData.o]
Error 1
make[3]: *** Waiting for unfinished jobs....
make[2]: *** [hotspot-server-libs] Error 2
make[2]: *** Waiting for unfinished jobs?.
=======================8<???????????

Here is my build environment

Configuration summary:
* Name: macosx-aarch64-server-release
* Debug level: release
* HS debug level: product
* JVM variants: server
* JVM features: server: 'cds compiler1 compiler2 dtrace epsilongc
g1gc jfr jni-check jvmci jvmti management parallelgc serialgc
services shenandoahgc vm-structs zgc'
* OpenJDK target: OS: macosx, CPU architecture: aarch64, address
length: 64
* Version string: 22+9-b1917 (22)
* Source date: 1701334649 (2023-11-30T08:57:29Z)

Tools summary:
* Boot JDK: openjdk version "22" 2024-03-19 OpenJDK Runtime
Environment JBR-22+9-1795-nomod (build 22+9-b1795) OpenJDK 64-Bit
Server VM JBR-22+9-1795-nomod (build 22+9-b1795, mixed mode)
* Toolchain: clang (clang/LLVM from Xcode 12.2)
* Sysroot:
/Applications/Xcode_12.2.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk
* C Compiler: Version 12.0.0 (at /usr/bin/clang)
* C++ Compiler: Version 12.0.0 (at /usr/bin/clang++)

Could you please clarify how to overcome this issue?

Thanks,
Vitaly

JornVernee added 13 commits October 26, 2023 01:43

WIP prune dead catch blocks

e695e9d

add BM

0579dfe

avoid allocation when looking up handler data

4d9a7d3

implement profiling for C2. JVMCI still to od

ed7f38d

fix no handler in NMethod case

a754ecc

ad IR test

de8e155

add tail to deopt test

eeca508

fix parameter profiling crasah

bed0e90

fix failing compiler tests

4f657bf

polish handling of MethodData sections

3bd0325

Remove redundant ciMethodData::_parameters field

301365c

snapshort ex handler data

6caa6c5

fix copyright header

f9899d3

openjdk bot added hotspot hotspot-dev@openjdk.org core-libs core-libs-dev@openjdk.org labels Oct 30, 2023

JornVernee added 2 commits October 30, 2023 15:18

fix initialization order

1912332

separate flags for profiling and pruning

e763e69

openjdk bot removed the core-libs core-libs-dev@openjdk.org label Oct 30, 2023

JornVernee added 3 commits October 30, 2023 17:32

Explicitly enable tiered compilation in TestPrunedExHandler

93287cb

disable pruning for OSR compilations. Because java/lang/Thread/virtua…

12a3a83

…l/stress/PinALot.java#id1 fails

look for monitorexit in pruned blocks

78837c4

JornVernee force-pushed the PruneDeadCatchBlocks branch from 2744204 to 78837c4 Compare October 31, 2023 13:54

JornVernee added 4 commits October 31, 2023 16:24

add exception handler pruning stress flags

e223d95

use ciMethod::has_monitor_bytecodes

a484206

use has_monitor_bytecodes() in c1 as well

a33a905

Revert "add exception handler pruning stress flags"

8d3a9aa

This reverts commit e223d95.

JornVernee added 3 commits November 17, 2023 11:27

Merge branch 'master' into PruneDeadCatchBlocks

19d0215

Remove has_monitors fix

0a5e247

add too_many_traps check

bee0553

JornVernee added 2 commits November 17, 2023 14:33

Revert "add too_many_traps check"

595bdaa

This reverts commit bee0553.

fix linux compile

46c9434

iwanowww approved these changes Nov 23, 2023

View reviewed changes

openjdk bot added the ready Pull request is ready to be integrated label Nov 23, 2023

JornVernee added 2 commits November 23, 2023 16:08

rename ex_handler -> exception_handler

46a74db

add interpreter profiling specific test cases

dfd5da1

openjdk bot mentioned this pull request Nov 23, 2023

8320310: CompiledMethod::has_monitors flag can be incorrect #16799

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openjdk bot closed this Nov 28, 2023

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8267532: C2: Profile and prune untaken exception handlers #16416

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8267532: C2: Profile and prune untaken exception handlers #16416

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