diff options
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 17 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 13 |
2 files changed, 29 insertions, 1 deletions
diff --git a/sysdeps/x86/cacheinfo.c b/sysdeps/x86/cacheinfo.c index 8408624ea4..e00e19f91e 100644 --- a/sysdeps/x86/cacheinfo.c +++ b/sysdeps/x86/cacheinfo.c @@ -16,6 +16,8 @@ License along with the GNU C Library; if not, see <http://www.gnu.org/licenses/>. */ +#if IS_IN (libc) + #include <assert.h> #include <stdbool.h> #include <stdlib.h> @@ -656,6 +658,11 @@ init_cacheinfo (void) #endif } + const struct cache_info *cache = &GLRO(dl_x86_cpu_features).cache; + + if (cache->raw_data_size != 0) + data = cache->raw_data_size; + if (data > 0) { __x86_raw_data_cache_size_half = data / 2; @@ -666,6 +673,9 @@ init_cacheinfo (void) __x86_data_cache_size = data; } + if (cache->raw_shared_size != 0) + shared = cache->raw_shared_size; + if (shared > 0) { __x86_raw_shared_cache_size_half = shared / 2; @@ -679,5 +689,10 @@ init_cacheinfo (void) /* The large memcpy micro benchmark in glibc shows that 6 times of shared cache size is the approximate value above which non-temporal store becomes faster. */ - __x86_shared_non_temporal_threshold = __x86_shared_cache_size * 6; + __x86_shared_non_temporal_threshold + = (cache->shared_non_temporal_threshold != 0 + ? cache->shared_non_temporal_threshold + : __x86_shared_cache_size * 6); } + +#endif diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 9529d61ff5..335d96a3e1 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -164,6 +164,18 @@ #else /* __ASSEMBLER__ */ +struct cache_info +{ + /* Data cache size for use in memory and string routines, typically + L1 size. */ + long int raw_data_size; + /* Shared cache size for use in memory and string routines, typically + L2 or L3 size. */ + long int raw_shared_size; + /* Threshold to use non temporal store. */ + long int shared_non_temporal_threshold; +}; + enum { COMMON_CPUID_INDEX_1 = 0, @@ -193,6 +205,7 @@ struct cpu_features unsigned int family; unsigned int model; unsigned int feature[FEATURE_INDEX_MAX]; + struct cache_info cache; }; /* Used from outside of glibc to get access to the CPU features |