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Enhancement
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Resolution: Fixed
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P4
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21, 23, 24
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b06
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aarch64
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generic
| Issue | Fix Version | Assignee | Priority | Status | Resolution | Resolved In Build |
|---|---|---|---|---|---|---|
| JDK-8350016 | 24.0.2 | Liming Liu | P4 | Resolved | Fixed | master |
This ticket is to update the default value of CodeEntryAlignment from 64 to 32 for both Ampere-1A and 1B.
GCC uses 32 for both Ampere-1A [1] and 1B [2]. The microbenchmark CodeCacheStress also shows that the frontend stall can be reduced by 21% if CodeEntryAlignment changes from 64 to 32 regardless of CodeCacheSegmentSize being 64 or 128.
[1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=590a06afbf0e96813b5879742f38f3665512c854;hp=5ba25973e2f403ee48af2ba579af5017b2f650fb
[2] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=cbf2369f3b545e0187fe2e659c764fabf75bb479;hp=99d114c15523e0bfe7a89ef1947f82eb5ff0260b
GCC uses 32 for both Ampere-1A [1] and 1B [2]. The microbenchmark CodeCacheStress also shows that the frontend stall can be reduced by 21% if CodeEntryAlignment changes from 64 to 32 regardless of CodeCacheSegmentSize being 64 or 128.
[1] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=590a06afbf0e96813b5879742f38f3665512c854;hp=5ba25973e2f403ee48af2ba579af5017b2f650fb
[2] https://gcc.gnu.org/git/?p=gcc.git;a=commitdiff;h=cbf2369f3b545e0187fe2e659c764fabf75bb479;hp=99d114c15523e0bfe7a89ef1947f82eb5ff0260b
- backported by
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JDK-8350016 Update the default value of CodeEntryAlignment for Ampere-1A and 1B
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- Resolved
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- relates to
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- Resolved
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- links to
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Commit(master)
openjdk/jdk24u/010833df
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Commit(master)
openjdk/jdk/89ee1a55
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Review(master)
openjdk/jdk21u-dev/1411
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Review(master)
openjdk/jdk24u/70
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Review(master)
openjdk/jdk/22134
(2 links to)