diff options
| author | mjg <mjg@FreeBSD.org> | 2017-03-14 20:39:06 +0000 |
|---|---|---|
| committer | mjg <mjg@FreeBSD.org> | 2017-03-14 20:39:06 +0000 |
| commit | 57f28a25af7dd32fc8adea80c5ebb2b237cc86a6 (patch) | |
| tree | 737cb08dda40f605ac675a646c2cc84187887b9a /sys/conf | |
| parent | 8c08bfe0a237cbc568a58adcefa2b61e7a46fa9d (diff) | |
| download | FreeBSD-src-57f28a25af7dd32fc8adea80c5ebb2b237cc86a6.zip FreeBSD-src-57f28a25af7dd32fc8adea80c5ebb2b237cc86a6.tar.gz | |
MFC r312888:
Introduce __read_mostly and __exclusive_cache_line macros.
The intended use is to annotate frequently used globals which either rarely
change (and thus can be grouped in the same cacheline) or are an atomic counter
(which means it may benefit from being the only variable in the cacheline).
Linker script support is provided only for amd64. Architectures without it risk
having other variables put in, i.e. as if they were not annotated. This is
harmless from correctness point of view.
Diffstat (limited to 'sys/conf')
| -rw-r--r-- | sys/conf/ldscript.amd64 | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/sys/conf/ldscript.amd64 b/sys/conf/ldscript.amd64 index a9521d8..80ddba9 100644 --- a/sys/conf/ldscript.amd64 +++ b/sys/conf/ldscript.amd64 @@ -145,6 +145,17 @@ SECTIONS .got : { *(.got) } . = DATA_SEGMENT_RELRO_END (24, .); .got.plt : { *(.got.plt) } + . = ALIGN(64); + .data.read_mostly : + { + *(.data.read_mostly) + } + . = ALIGN(64); + .data.exclusive_cache_line : + { + *(.data.exclusive_cache_line) + } + . = ALIGN(64); .data : { *(.data .data.* .gnu.linkonce.d.*) |
