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| author | H.J. Lu <hjl.tools@gmail.com> | 2016-05-10 05:42:49 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2016-05-14 09:19:01 -0700 |
| commit | 4292da19f08b9d5e804909232489622bee6a60e3 (patch) | |
| tree | cb1ce5dd222b533113b65d75a039ef8e7d60d358 /sysdeps/x86/cacheinfo.c | |
| parent | 1fa001e37c3c62748b5ab00c30f9f3f0c7209286 (diff) | |
| download | glibc-hjl/ld.so/master.tar glibc-hjl/ld.so/master.tar.gz glibc-hjl/ld.so/master.tar.bz2 glibc-hjl/ld.so/master.zip | |
X86: Add cache info to _dl_x86_cpu_featureshjl/ld.so/master
This patch adds cache info to _dl_x86_cpu_features to allow a processor
to override cache info derived from CPUID.
Tested on x86 and x86-64.
* sysdeps/x86/cacheinfo.c: Skip if not in libc.
(init_cacheinfo): Use raw_data_size, raw_shared_size and
shared_non_temporal_threshold from _dl_x86_cpu_features if
not zero.
* sysdeps/x86/cpu-features.h (cache_info): New.
(cpu_features): Add cache.
Diffstat (limited to 'sysdeps/x86/cacheinfo.c')
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 17 |
1 files changed, 16 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 |