Author: mjg
Date: Fri May 11 08:56:39 2018
New Revision: 333486
URL: https://svnweb.freebsd.org/changeset/base/333486
Log:
amd64: align the .data.exclusive_cache_line section to 128
This aligns the section itself compared to other sections, does not change
internal alignment of fields stored inside. This may or may not come later.
The motivation is partially combating adverse effects of the adjacent cache
line prefetcher. Without the annotation part of read_mostly section was on
the line of fire.
Modified:
head/sys/conf/ldscript.amd64
Modified: head/sys/conf/ldscript.amd64
==============================================================================
--- head/sys/conf/ldscript.amd64 Fri May 11 08:16:56 2018
(r333485)
+++ head/sys/conf/ldscript.amd64 Fri May 11 08:56:39 2018
(r333486)
@@ -155,12 +155,12 @@ SECTIONS
{
*(.data.read_mostly)
}
- . = ALIGN(64);
+ . = ALIGN(128);
.data.exclusive_cache_line :
{
*(.data.exclusive_cache_line)
}
- . = ALIGN(64);
+ . = ALIGN(128);
.data :
{
*(.data .data.* .gnu.linkonce.d.*)
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