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8254699: Suboptimal PreTouchParallelChunkSize defaults and limits

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Reviewed-by: tschatzl, sjohanss
This commit is contained in:
Amit Pawar 2020-12-03 19:05:04 +00:00 committed by Thomas Schatzl
parent e29ee5b8a5
commit 805d05812c
5 changed files with 6 additions and 2 deletions
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1
src/hotspot/os/aix/globals_aix.hpp
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@ -86,6 +86,7 @@
// UseLargePages means nothing, for now, on AIX.
// Use Use64KPages or Use16MPages instead.
define_pd_global(size_t, PreTouchParallelChunkSize, 1 * G);
define_pd_global(bool, UseLargePages, false);
define_pd_global(bool, UseLargePagesIndividualAllocation, false);
define_pd_global(bool, UseThreadPriorities, true) ;

1
src/hotspot/os/bsd/globals_bsd.hpp
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@ -42,6 +42,7 @@
// Defines Bsd-specific default values. The flags are available on all
// platforms, but they may have different default values on other platforms.
//
define_pd_global(size_t, PreTouchParallelChunkSize, 1 * G);
define_pd_global(bool, UseLargePages, false);
define_pd_global(bool, UseLargePagesIndividualAllocation, false);
define_pd_global(bool, UseThreadPriorities, true) ;

1
src/hotspot/os/linux/globals_linux.hpp
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@ -90,6 +90,7 @@
// Defines Linux-specific default values. The flags are available on all
// platforms, but they may have different default values on other platforms.
//
define_pd_global(size_t, PreTouchParallelChunkSize, 4 * M);
define_pd_global(bool, UseLargePages, false);
define_pd_global(bool, UseLargePagesIndividualAllocation, false);
define_pd_global(bool, UseThreadPriorities, true) ;

1
src/hotspot/os/windows/globals_windows.hpp
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@ -45,6 +45,7 @@ product(bool, UseOSErrorReporting, false, \
// Defines Windows-specific default values. The flags are available on all
// platforms, but they may have different default values on other platforms.
//
define_pd_global(size_t, PreTouchParallelChunkSize, 1 * G);
define_pd_global(bool, UseLargePages, false);
define_pd_global(bool, UseLargePagesIndividualAllocation, true);
define_pd_global(bool, UseThreadPriorities, true) ;

4
src/hotspot/share/gc/shared/gc_globals.hpp
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@ -200,9 +200,9 @@
product(bool, AlwaysPreTouch, false, \
"Force all freshly committed pages to be pre-touched") \
\
product(size_t, PreTouchParallelChunkSize, 1 * G, \
product_pd(size_t, PreTouchParallelChunkSize, \
"Per-thread chunk size for parallel memory pre-touch.") \
range(1, SIZE_MAX / 2) \
range(4*K, SIZE_MAX / 2) \
\
/* where does the range max value of (max_jint - 1) come from? */ \
product(size_t, MarkStackSizeMax, NOT_LP64(4*M) LP64_ONLY(512*M), \