RFR (L): 8015774: Add support for multiple code heaps

[Volker Simonis]

Hi Tobias,

is this change intended for jdk8 or 9? In any case, I saw that your
webrev is based on the hsx repository which I thought should not be
used any more. Could you please rebase your patch on jdk9 and also
update the corresponding ppc64 files in the webrev (as far as I can
see, that's only src/cpu/ppc/vm/c2_globals_ppc.hpp). I'd like to test
this on Linux/PPC64 and AIX as well.

Thank you and best regards,
Volker



On Mon, Apr 14, 2014 at 1:56 PM, Tobias Hartmann
<Tobias.Hartmann at oracle.com> wrote:
> Hi,
>
> please review the new version of the following patch that adds support for
> multiple code heaps to the code cache.
>
> Bug: https://bugs.openjdk.java.net/browse/JDK-8015774
> Webrev: http://cr.openjdk.java.net/~anoll/8015774/webrev.04/
>
> Short description:
> This change implements support for multiple code heaps in the code cache.
> The interface of the code cache was changed accordingly and references from
> other components of the VM were adapted. This includes the indirect
> references from:
> - the Serviceability Agent: vmStructs and the Java code cache interface
> (sun.jvm.hotspot.code.CodeCache)
> - the dtrace ustack helper script (jhelper.d)
> - the pstack support library libjvm_db.c
>
> Currently the code cache contains the following three code heaps each of
> which contains CodeBlobs of a specific type:
> - Non-Profiled methods: nmethods that are not profiled and native methods
> - Profiled methods: nmethods that are profiled
> - Non-methods: Non-methods like buffers and adapters
>
> By default the non-method code heap uses 3 MB plus additional space for the
> compiler buffers that is dependent on the number of compiler threads (see
> CodeCache::initialize_heaps). The remaining code cache space is distributed
> equally among the non-profiled and the profiled code heaps.
>
> Tested:
> JPRT, SPECjvm2008, SPECjbb2005, SPECjbb2013, Octane + Nashorn
>
> Thanks,
> Tobias
>
>
> -------- Original Message --------
> Subject: Re: RFR (L): 8015774: Add support for multiple code heaps
> Date: Mon, 21 Oct 2013 17:47:48 +0200
> From: Albert Noll <albert.noll at oracle.com>
> To: Azeem Jiva <azeem.jiva at oracle.com>
>
>
> That is fine. As we realized the last two weeks, there is more work to be
> done to make multiple code heaps work effectively.
>
> Albert
>
> Von meinem iPhone gesendet
>
> Am 21.10.2013 um 17:36 schrieb Azeem Jiva <azeem.jiva at oracle.com>:
>
> I still think we should hold off for JDK8u20
>
> --
> Azeem Jiva
> @javawithjiva
>
> On Oct 21, 2013, at 8:33 AM, Albert Noll <albert.noll at oracle.com> wrote:
>
>
> Von meinem iPhone gesendet
>
> Anfang der weitergeleiteten E‑Mail:
>
> Von: Vladimir Kozlov <vladimir.kozlov at oracle.com>
> Datum: 11. Oktober 2013 19:38:07 MESZ
> An: hotspot-compiler-dev at openjdk.java.net
> Betreff: Re: RFR (L): 8015774: Add support for multiple code heaps
>
> This looks acceptable.
>
> Thanks,
> Vladimir