RFR: JDK-8256155: os::Linux Populate all large_page_sizes, select smallest page size in reserve_memory_special_huge_tlbfs* [v7]
Marcus G K Williams
github.com+168222+mgkwill at openjdk.java.net
Mon Dec 7 19:54:25 UTC 2020
> When using LargePageSizeInBytes=1G, os::Linux::reserve_memory_special_huge_tlbfs* cannot select large pages smaller than 1G. Code heap usually uses less than 1G, so currently the code precludes code heap from using
> Large pages in this circumstance and when os::Linux::reserve_memory_special_huge_tlbfs* is called page sizes fall back to Linux::page_size() (usually 4k).
>
> This change allows the above use case by populating all large_page_sizes present in /sys/kernel/mm/hugepages in _page_sizes upon calling os::Linux::setup_large_page_size().
>
> In os::Linux::reserve_memory_special_huge_tlbfs* we then select the largest large page size available in _page_sizes that is smaller than bytes being reserved.
Marcus G K Williams has updated the pull request incrementally with one additional commit since the last revision:
Fix merge mistakes
Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
-------------
Changes:
- all: https://git.openjdk.java.net/jdk/pull/1153/files
- new: https://git.openjdk.java.net/jdk/pull/1153/files/1a33482b..5cd6d6a8
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=06
- incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=05-06
Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
Patch: https://git.openjdk.java.net/jdk/pull/1153.diff
Fetch: git fetch https://git.openjdk.java.net/jdk pull/1153/head:pull/1153
PR: https://git.openjdk.java.net/jdk/pull/1153
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