[11u] RFR: 8059241: C2: Excessive RemoveUseless passes during incremental inlining

[Hohensee, Paul]

It's also been in Corretto (our public distro) since 11.0.9.

-----Original Message-----
From: jdk-updates-dev <jdk-updates-dev-retn at openjdk.java.net> on behalf of "Hohensee, Paul" <hohensee at amazon.com>
Date: Tuesday, April 6, 2021 at 11:31 AM
To: Andrew Haley <aph at redhat.com>, Roland Westrelin <rwestrel at redhat.com>, "jdk-updates-dev at openjdk.java.net" <jdk-updates-dev at openjdk.java.net>
Subject: RE: [11u] RFR: 8059241: C2: Excessive RemoveUseless passes during incremental inlining

Hi, Andrew,

We backported this patch because we noticed increased compilation overhead after we increased MaxInlineDepth to 15. We've been running with it (and the follow-on patches) in production starting with 11.0.9 (last October) with no issues. At our scale, even relatively small improvements help reduce fleet costs.

Thanks,
Paul

-----Original Message-----
From: jdk-updates-dev <jdk-updates-dev-retn at openjdk.java.net> on behalf of Andrew Haley <aph at redhat.com>
Date: Monday, March 29, 2021 at 7:46 AM
To: Roland Westrelin <rwestrel at redhat.com>, "jdk-updates-dev at openjdk.java.net" <jdk-updates-dev at openjdk.java.net>
Subject: RE: [11u] RFR: 8059241: C2: Excessive RemoveUseless passes during incremental inlining

On 3/29/21 12:03 PM, Roland Westrelin wrote:
>
>> Okay. Will you review this, please? And please consider the likely
>> performance gain v.s churn and risk.
>
> I reviewed it. I think we would need to know what motivates the
> backport to make a judgement.

OK, thanks. Over to you, Dan.

--
Andrew Haley  (he/him)
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
https://keybase.io/andrewhaley
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