RFR: JDK-8256155: os::Linux Populate all large_page_sizes, select smallest page size in reserve_memory_special_huge_tlbfs* [v8]
Marcus G K Williams
github.com+168222+mgkwill at openjdk.java.net
Mon Dec 7 19:59:28 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 three additional commits since the last revision:
- Merge branch 'update_hlp' of github.com:mgkwill/jdk into update_hlp
- Add newline at end of TestLargePageUseForAuxMemory.java
Signed-off-by: Marcus G K Williams <marcus.williams at intel.com>
- 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/5cd6d6a8..073ffabe
Webrevs:
- full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=07
- incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1153&range=06-07
Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 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
More information about the hotspot-dev
mailing list