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  1. JDK
  2. JDK-8232207

Linux os::available_memory re-reads cgroup configuration on every invocation

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    • Subcomponent:
    • Resolved In Build:
      b20
    • CPU:
      x86
    • OS:
      linux

      Backports

        Description

        On Linux systems considered containerized then os::available_memory will call into OSContainer::memory_limit_in_bytes and read the memory limit information from the /proc/self/mountinfo or similar.

        This can take significant background resources, mostly since os::available_memory is called every iteration of each compiler thread's main loop to help determine if the system should add more compiler threads.

        There are a couple of possible solutions:

        - add a grace time to how often OSContainer::memory_limit_in_bytes actually reads the /proc configuration
        - refactor compiler thread loop to make that possibly_add_compiler_threads a periodic task rather than something that each and every compiler thread does between every compilation

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            backported by

            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-8233532 Linux os::available_memory re-reads cgroup configuration on every invocation

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8237333 Linux os::available_memory re-reads cgroup configuration on every invocation

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • 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-8246068 Linux os::available_memory re-reads cgroup configuration on every invocation

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

            Bug - A problem which impairs or prevents the functions of the product. JDK-8227006 [linux] Runtime.availableProcessors execution time increased by factor of 100

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

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                Assignee:
                redestad Claes Redestad
                Reporter:
                redestad Claes Redestad
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                  Updated:
                  Resolved: