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INACTIVE: ZOS Xlp Codecache and ObjectHeap Changes #412

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INACTIVE: ZOS Xlp Codecache and ObjectHeap Changes #412

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ZOS Xlp Codecache and ObjectHeap Changes
Oct 24, 2019
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Dec 3, 2019
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8 changes: 2 additions & 6 deletions docs/xlpcodecache.md
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Expand Up @@ -32,14 +32,10 @@ To find out the large page sizes available and the current setting, use the `-ve

## Syntax

AIX®, Linux®, macOS®, and Windows™:
AIX®, Linux®, macOS®, Windows™ and Z/OS®:
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This is all platforms now, so we don't need to give a platform list.


-Xlp:codecache:pagesize=<size>

z/OS&reg;:

-Xlp:codecache:pagesize=<size>,pageable
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This still needs to be a valid option on z/OS, and shouldn't be removed from the docs.


See [Using -X command-line options](x_jvm_commands.md) for more information about the `<size>` parameter.

## Default values
Expand Down Expand Up @@ -67,7 +63,7 @@ See [Using -X command-line options](x_jvm_commands.md) for more information abou

: 1 MB pageable pages, when available, are the default size for the code cache.

The `-Xlp:codecache:pagesize=<size>,pageable` option supports only a large page size of 1 MB pageable large pages. The use of 1 MB pageable large pages for the JIT code cache can improve the runtime performance of some Java&trade; applications. A page size of 4 KB can also be used.
The `-Xlp:codecache:pagesize=<size>` option supports only a large page size of 1 MB pageable large pages. The use of 1 MB pageable large pages for the JIT code cache can improve the runtime performance of some Java&trade; applications. A page size of 4 KB can also be used.
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Both variants should be explicit, i.e. The -Xlp:codecache:pagesize=<size> and -Xlp:codecache:pagesize=<size>,pageable options ...


## See also

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8 changes: 3 additions & 5 deletions docs/xlpobjectheap.md
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Expand Up @@ -31,14 +31,10 @@ To find out the large page sizes available and the current setting, use the `-ve

## Syntax

AIX&reg;, Linux&reg;, macOS&reg;, and Windows&trade;:
AIX&reg;, Linux&reg;, macOS&reg;, Windows&trade; and Z/OS&reg;:
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This is all platforms now, so we don't need to give a platform list.


-Xlp:objectheap:pagesize=<size>[,strict|warn]

z/OS&reg;:

-Xlp:objectheap:pagesize=<size>[,strict|warn][,pageable|nonpageable]
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This still needs to be a valid option on z/OS, and shouldn't be removed from the docs.

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@pshipton pshipton Oct 24, 2019 •
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I note this option specification is incorrect until eclipse-openj9/openj9#7585 is merged, as pageable|nonpageable is not optional


See [Using -X command-line options](x_jvm_commands.md) for more information about the `<size>` parameter.

## Parameters
Expand All @@ -61,6 +57,8 @@ See [Using -X command-line options](x_jvm_commands.md) for more information abou

: On macOS, the default page size is 4 KB.

: On Z/OS&reg If both 1M pageable, and nonpageable large pages are available then 1M pageable large pages will be used by default if [non]pageable is not specified.
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When the pageable|nonpageable option isn't specified ...


### `strict` | `warn`

-Xlp:objectheap:strict
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