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| author | Andres Freund <andres@anarazel.de> | 2017-03-10 11:14:06 -0800 |
|---|---|---|
| committer | Andres Freund <andres@anarazel.de> | 2017-03-10 11:19:54 -0800 |
| commit | f8f1430ae709c0018a217c77893754f38b3c5b93 (patch) | |
| tree | fdae5349ec0cbc6f7748753c81725e6d595c7794 | |
| parent | f39ddd843667c68f760cb4cf23c89c1f1d9aebb8 (diff) | |
| download | postgresql-f8f1430ae709c0018a217c77893754f38b3c5b93.tar.gz postgresql-f8f1430ae709c0018a217c77893754f38b3c5b93.zip | |
Enable 64 bit atomics on ARM64.
Previously they were disabled due to performance concerns on 32bit
arm, where 64bit atomics are often implemented via kernel traps.
Author: Roman Shaposhnik
Discussion: http://postgr.es/m/CA+ULb+uErkFuXUCCXWHYvnV5KnAyjGUzzRcPA-M0cgO+Hm4RSA@mail.gmail.com
| -rw-r--r-- | src/include/port/atomics/arch-arm.h | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/include/port/atomics/arch-arm.h b/src/include/port/atomics/arch-arm.h index 563531c2d63..58614ae2cac 100644 --- a/src/include/port/atomics/arch-arm.h +++ b/src/include/port/atomics/arch-arm.h @@ -18,8 +18,9 @@ #endif /* - * 64 bit atomics on arm are implemented using kernel fallbacks and might be - * slow, so disable entirely for now. - * XXX: We might want to change that at some point for AARCH64 + * 64 bit atomics on ARM32 are implemented using kernel fallbacks and thus + * might be slow, so disable entirely. On ARM64 that problem doesn't exist. */ +#if !defined(__aarch64__) && !defined(__aarch64) #define PG_DISABLE_64_BIT_ATOMICS +#endif /* __aarch64__ || __aarch64 */ |