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  1. JDK
  2. JDK-8256287

[windows] add loop fuse to map_or_reserve_memory_aligned

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      Description

        map_or_reserve_memory_aligned attempts to allocate aligned memory by:
        1) reserving larger area
        2) releasing it
        3) attempting to re-reserve into the vacated address space a smaller area at the aligned start address

        Since this may fail (between (2) and (3) someone may have grabbed that address concurrently), we do this in a loop. However, when failing to release it we will loop-reserve endlessly.

        This is one of the reasons for JDK-8255954 whose root cause will be fixed with JDK-8255978. But we should guard against endless loops independently from that.

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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-8263193 [windows] add loop fuse to map_or_reserve_memory_aligned

            • 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-8263308 [windows] add loop fuse to map_or_reserve_memory_aligned

            • 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-8255954 [windows] UseNUMAInterleaving causes VM to balloon and hang

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8255978 [windows] os::release_memory may not release the full range

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            links to

            Commit Commit openjdk/jdk/0357db35

            Review Review openjdk/jdk/1191

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                stuefe Thomas Stuefe
                stuefe Thomas Stuefe
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                  Updated:
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