sparc64, i386 and x86_64 have support for a special data section dedicated to rarely updated data that is frequently read. The section was created to avoid false sharing of those rarely read data with frequently written kernel data. This patch creates such a data section for ia64 and will group rarely written data into this section.
Unified · Split
| @@ -177,6 +177,9 @@ SECTIONS · 176 unmodified lines | ||
| 177 | 177 | } |
| 178 | 178 | . = ALIGN(PAGE_SIZE); /* make sure the gate page doesn't expose kernel data */ |
| 179 | 179 | |
| 180 | + .data.read_mostly : AT(ADDR(.data.read_mostly) - LOAD_OFFSET) | |
| 181 | + { *(.data.read_mostly) } | |
| 182 | + | |
| 180 | 183 | .data.cacheline_aligned : AT(ADDR(.data.cacheline_aligned) - LOAD_OFFSET) |
| 181 | 184 | { *(.data.cacheline_aligned) } |
| 182 | 185 | |
| @@ -13,7 +13,7 @@ · 12 unmodified lines | ||
| 13 | 13 | #define SMP_CACHE_BYTES L1_CACHE_BYTES |
| 14 | 14 | #endif |
| 15 | 15 | |
| 16 | −#if defined(CONFIG_X86) || defined(CONFIG_SPARC64) | |
| 16 | +#if defined(CONFIG_X86) || defined(CONFIG_SPARC64) || defined(CONFIG_IA64) | |
| 17 | 17 | #define __read_mostly __attribute__((__section__(".data.read_mostly"))) |
| 18 | 18 | #else |
| 19 | 19 | #define __read_mostly |