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  1. JDK
  2. JDK-8303215

Make thread stacks not use huge pages

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    • b26
    • linux

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      Description

        When a system has Transparent Huge Pages (THP) enabled (/sys/kernel/mm/transparent_hugepage/enabled is set to 'always'), thread stacks can have significantly more resident set size (RSS) than they actually require. This occurs when the stack size is 2MB or larger, which makes the memory range of the stack more likely to be aligned on a 2MB boundary. This in turn makes the stack eligible to be backed by huge pages resulting in more memory consumption than it would otherwise when standard small pages are used. This issue is more apparent on AArch64 platforms where the default stack size is 2MB.

        The JVM should explicitly make the thread stacks not use huge pages. This can be done by calling 'madvise' on the stack memory with MADV_NOHUGEPAGE advice instructing the kernel not to back the stack address range with huge pages.

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            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8309414 Make thread stacks not use huge pages

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8310590 Make thread stacks not use huge pages

            • P3 - Major loss of function.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8310740 Make thread stacks not use huge pages

            • P3 - Major loss of function.
            • Resolved
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8310687 JDK-8303215 is incomplete

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8312182 THPs cause huge RSS due to thread start timing issue

            • P3 - Major loss of function.
            • Resolved
            links to

            Commit Commit openjdk/jdk17u-dev/dfe3555b

            Commit Commit openjdk/jdk/59d9d9fc

            Review Review openjdk/jdk11u-dev/2086

            Review Review openjdk/jdk11u-dev/2208

            Review Review openjdk/jdk17u-dev/1492

            Review Review openjdk/jdk/14105

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                poonam Poonam Bajaj Parhar
                poonam Poonam Bajaj Parhar
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