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| author | H.J. Lu <hjl.tools@gmail.com> | 2017-05-23 20:22:13 -0700 |
|---|---|---|
| committer | H.J. Lu <hjl.tools@gmail.com> | 2017-05-24 06:35:25 -0700 |
| commit | 42419536fd1effe9a05fa4efa92742b52e2ffae8 (patch) | |
| tree | f33e4d3b507a9978e481064886e1cd56284df13a | |
| parent | 9c450f6f6f0e2089b780d0510ae6153740fc7d1d (diff) | |
| download | glibc-hjl/cacheinfo/master.zip glibc-hjl/cacheinfo/master.tar.gz glibc-hjl/cacheinfo/master.tar.bz2 | |
x86: Add cache info to cpu_featureshjl/cacheinfo/master
This patch adds cache info to cpu_features to support tunables for both
cache info as well as CPU features in a single x86 namespace. Since
init_cacheinfo is in libc.so and cpu_features is in ld.so, cache info
and CPU features must be in a place for tunables.
* sysdeps/x86/cacheinfo.c (init_cacheinfo): Use data_size,
shared_size and non_temporal_threshold from cpu_features if
they aren't zero.
* sysdeps/x86/cpu-features.h (cache_info): New.
(cpu_features): Add cache.
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 11 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 13 |
2 files changed, 23 insertions, 1 deletions
diff --git a/sysdeps/x86/cacheinfo.c b/sysdeps/x86/cacheinfo.c index 12ffeef..321fbb6 100644 --- a/sysdeps/x86/cacheinfo.c +++ b/sysdeps/x86/cacheinfo.c @@ -745,6 +745,9 @@ intel_bug_no_cache_info: #endif } + if (cpu_features->cache.data_size != 0) + data = cpu_features->cache.data_size; + if (data > 0) { __x86_raw_data_cache_size_half = data / 2; @@ -755,6 +758,9 @@ intel_bug_no_cache_info: __x86_data_cache_size = data; } + if (cpu_features->cache.shared_size != 0) + shared = cpu_features->cache.shared_size; + if (shared > 0) { __x86_raw_shared_cache_size_half = shared / 2; @@ -768,7 +774,10 @@ intel_bug_no_cache_info: /* 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 + = (cpu_features->cache.non_temporal_threshold != 0 + ? cpu_features->cache.non_temporal_threshold + : __x86_shared_cache_size * 6); } #endif diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index 31c7c80..f428dca 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -185,6 +185,18 @@ #else /* __ASSEMBLER__ */ +struct cache_info +{ + /* Data cache size for use in memory and string routines, typically + L1 size. */ + long int data_size; + /* Shared cache size for use in memory and string routines, typically + L2 or L3 size. */ + long int shared_size; + /* Threshold to use non temporal store. */ + long int non_temporal_threshold; +}; + enum { COMMON_CPUID_INDEX_1 = 0, @@ -214,6 +226,7 @@ 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 |