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7037939: NUMA: Disable adaptive resizing if SHM large pages are used

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Make the NUMA allocator behave properly with SHM and ISM large pages.

Reviewed-by: ysr
This commit is contained in:
Igor Veresov 2011-04-26 11:46:34 -07:00
parent 385e7253a7
commit e3121a5a43
2 changed files with 34 additions and 1 deletions
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17
hotspot/src/os/linux/vm/os_linux.cpp
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@ -4170,6 +4170,23 @@ jint os::init_2(void)
UseNUMA = false;
}
}
// With SHM large pages we cannot uncommit a page, so there's not way
// we can make the adaptive lgrp chunk resizing work. If the user specified
// both UseNUMA and UseLargePages (or UseSHM) on the command line - warn and
// disable adaptive resizing.
if (UseNUMA && UseLargePages && UseSHM) {
if (!FLAG_IS_DEFAULT(UseNUMA)) {
if (FLAG_IS_DEFAULT(UseLargePages) && FLAG_IS_DEFAULT(UseSHM)) {
UseLargePages = false;
} else {
warning("UseNUMA is not fully compatible with SHM large pages, disabling adaptive resizing");
UseAdaptiveSizePolicy = false;
UseAdaptiveNUMAChunkSizing = false;
}
} else {
UseNUMA = false;
}
}
if (!UseNUMA && ForceNUMA) {
UseNUMA = true;
}