diff options
| -rw-r--r-- | ChangeLog | 25 | ||||
| -rw-r--r-- | elf/dl-tunables.list | 16 | ||||
| -rw-r--r-- | manual/tunables.texi | 36 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86/dl-sysdep.c | 21 | ||||
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 10 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.c | 19 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-features.h | 8 | ||||
| -rw-r--r-- | sysdeps/x86/cpu-tunables.c | 330 |
8 files changed, 464 insertions, 1 deletions
@@ -1,3 +1,28 @@ +2017-06-20 H.J. Lu <hongjiu.lu@intel.com> + Erich Elsen <eriche@google.com> + + * elf/dl-tunables.list (tune): Add ifunc, + x86_non_temporal_threshold, + x86_data_cache_size and x86_shared_cache_size. + * manual/tunables.texi: Document glibc.tune.ifunc, + glibc.tune.x86_data_cache_size, glibc.tune.x86_shared_cache_size + and glibc.tune.x86_non_temporal_threshold. + * sysdeps/unix/sysv/linux/x86/dl-sysdep.c: New file. + * sysdeps/x86/cpu-tunables.c: Likewise. + * sysdeps/x86/cacheinfo.c + (init_cacheinfo): Check and get data cache size, shared cache + size and non temporal threshold from cpu_features. + * sysdeps/x86/cpu-features.c [HAVE_TUNABLES] (TUNABLE_NAMESPACE): + New. + [HAVE_TUNABLES] Include <unistd.h>. + [HAVE_TUNABLES] Include <elf/dl-tunables.h>. + [HAVE_TUNABLES] (TUNABLE_CALLBACK (set_ifunc)): Likewise. + [HAVE_TUNABLES] (init_cpu_features): Use TUNABLE_GET to set + IFUNC selection, data cache size, shared cache size and non + temporal threshold. + * sysdeps/x86/cpu-features.h (cpu_features): Add data_cache_size, + shared_cache_size and non_temporal_threshold. + 2017-06-20 Wilco Dijkstra <wdijkstr@arm.com> * benchtests/README: Describe workload feature. diff --git a/elf/dl-tunables.list b/elf/dl-tunables.list index 41ce9af..3247d49 100644 --- a/elf/dl-tunables.list +++ b/elf/dl-tunables.list @@ -82,6 +82,22 @@ glibc { type: UINT_64 env_alias: LD_HWCAP_MASK default: HWCAP_IMPORTANT + } + ifunc { + type: STRING + security_level: SXID_IGNORE + } + x86_non_temporal_threshold { + type: SIZE_T + security_level: SXID_IGNORE + } + x86_data_cache_size { + type: SIZE_T + security_level: SXID_IGNORE + } + x86_shared_cache_size { + type: SIZE_T + security_level: SXID_IGNORE } } } diff --git a/manual/tunables.texi b/manual/tunables.texi index c9a4cb7..3263f94 100644 --- a/manual/tunables.texi +++ b/manual/tunables.texi @@ -198,6 +198,14 @@ is 8 times the number of cores online. @cindex hardware capability tunables @cindex hwcap tunables @cindex tunables, hwcap +@cindex ifunc tunables +@cindex tunables, ifunc +@cindex data_cache_size tunables +@cindex tunables, data_cache_size +@cindex shared_cache_size tunables +@cindex tunables, shared_cache_size +@cindex non_temporal_threshold tunables +@cindex tunables, non_temporal_threshold @deftp {Tunable namespace} glibc.tune Behavior of @theglibc{} can be tuned to assume specific hardware capabilities @@ -213,3 +221,31 @@ extensions available in the processor at runtime for some architectures. The @code{glibc.tune.hwcap_mask} tunable allows the user to mask out those capabilities at runtime, thus disabling use of those extensions. @end deftp + +@deftp Tunable glibc.tune.ifunc +The @code{glibc.tune.ifunc=-xxx,yyy,-zzz...} tunable allows the user to +enable CPU/ARCH feature @code{yyy}, disable CPU/ARCH feature @code{xxx} +and @code{zzz} where the feature name is case-sensitive and has to match +the ones in @code{sysdeps/x86/cpu-features.h}. + +This tunable is specific to i386 and x86-64. +@end deftp + +@deftp Tunable glibc.tune.x86_data_cache_size +The @code{glibc.tune.x86_data_cache_size} tunable allows the user to set +data cache size in bytes for use in memory and string routines. + +This tunable is specific to i386 and x86-64. +@end deftp + +@deftp Tunable glibc.tune.x86_shared_cache_size +The @code{glibc.tune.x86_shared_cache_size} tunable allows the user to +set shared cache size in bytes for use in memory and string routines. +@end deftp + +@deftp Tunable glibc.tune.x86_non_temporal_threshold +The @code{glibc.tune.x86_non_temporal_threshold} tunable allows the user +to set threshold in bytes for non temporal store. + +This tunable is specific to i386 and x86-64. +@end deftp diff --git a/sysdeps/unix/sysv/linux/x86/dl-sysdep.c b/sysdeps/unix/sysv/linux/x86/dl-sysdep.c new file mode 100644 index 0000000..64eb0d7 --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86/dl-sysdep.c @@ -0,0 +1,21 @@ +/* Operating system support for run-time dynamic linker. X86 version. + Copyright (C) 2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <config.h> +#include <sysdeps/x86/cpu-tunables.c> +#include <sysdeps/unix/sysv/linux/dl-sysdep.c> diff --git a/sysdeps/x86/cacheinfo.c b/sysdeps/x86/cacheinfo.c index 8000fd1..9542dfb 100644 --- a/sysdeps/x86/cacheinfo.c +++ b/sysdeps/x86/cacheinfo.c @@ -752,6 +752,9 @@ intel_bug_no_cache_info: #endif } + if (cpu_features->data_cache_size != 0) + data = cpu_features->data_cache_size; + if (data > 0) { __x86_raw_data_cache_size_half = data / 2; @@ -762,6 +765,9 @@ intel_bug_no_cache_info: __x86_data_cache_size = data; } + if (cpu_features->shared_cache_size != 0) + shared = cpu_features->shared_cache_size; + if (shared > 0) { __x86_raw_shared_cache_size_half = shared / 2; @@ -777,7 +783,9 @@ intel_bug_no_cache_info: store becomes faster on a 8-core processor. This is the 3/4 of the total shared cache size. */ __x86_shared_non_temporal_threshold - = __x86_shared_cache_size * threads * 3 / 4; + = (cpu_features->non_temporal_threshold != 0 + ? cpu_features->non_temporal_threshold + : __x86_shared_cache_size * threads * 3 / 4); } #endif diff --git a/sysdeps/x86/cpu-features.c b/sysdeps/x86/cpu-features.c index 4288001..76f053a 100644 --- a/sysdeps/x86/cpu-features.c +++ b/sysdeps/x86/cpu-features.c @@ -20,6 +20,15 @@ #include <cpu-features.h> #include <dl-hwcap.h> +#if HAVE_TUNABLES +# define TUNABLE_NAMESPACE tune +# include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */ +# include <elf/dl-tunables.h> + +extern void TUNABLE_CALLBACK (set_ifunc) (tunable_val_t *) + attribute_hidden; +#endif + static void get_common_indeces (struct cpu_features *cpu_features, unsigned int *family, unsigned int *model, @@ -312,6 +321,16 @@ no_cpuid: cpu_features->model = model; cpu_features->kind = kind; +#if HAVE_TUNABLES + TUNABLE_GET (ifunc, tunable_val_t *, TUNABLE_CALLBACK (set_ifunc)); + cpu_features->non_temporal_threshold + = TUNABLE_GET (x86_non_temporal_threshold, long int, NULL); + cpu_features->data_cache_size + = TUNABLE_GET (x86_data_cache_size, long int, NULL); + cpu_features->shared_cache_size + = TUNABLE_GET (x86_shared_cache_size, long int, NULL); +#endif + /* Reuse dl_platform, dl_hwcap and dl_hwcap_mask for x86. */ GLRO(dl_platform) = NULL; GLRO(dl_hwcap) = 0; diff --git a/sysdeps/x86/cpu-features.h b/sysdeps/x86/cpu-features.h index f2329ea..fef5e18 100644 --- a/sysdeps/x86/cpu-features.h +++ b/sysdeps/x86/cpu-features.h @@ -215,6 +215,14 @@ struct cpu_features unsigned int family; unsigned int model; unsigned int feature[FEATURE_INDEX_MAX]; + /* Data cache size for use in memory and string routines, typically + L1 size. */ + long int data_cache_size; + /* Shared cache size for use in memory and string routines, typically + L2 or L3 size. */ + long int shared_cache_size; + /* Threshold to use non temporal store. */ + long int non_temporal_threshold; }; /* Used from outside of glibc to get access to the CPU features diff --git a/sysdeps/x86/cpu-tunables.c b/sysdeps/x86/cpu-tunables.c new file mode 100644 index 0000000..9258fb4 --- /dev/null +++ b/sysdeps/x86/cpu-tunables.c @@ -0,0 +1,330 @@ +/* x86 CPU feature tuning. + This file is part of the GNU C Library. + Copyright (C) 2017 Free Software Foundation, Inc. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#if HAVE_TUNABLES +# define TUNABLE_NAMESPACE tune +# include <stdbool.h> +# include <stdint.h> +# include <unistd.h> /* Get STDOUT_FILENO for _dl_printf. */ +# include <elf/dl-tunables.h> +# include <string.h> +# include <cpu-features.h> +# include <ldsodefs.h> + +/* We can't use IFUNC memcmp nor strlen in init_cpu_features from libc.a + since IFUNC must be set up by init_cpu_features. */ +# if defined USE_MULTIARCH && !defined SHARED +# ifdef __x86_64__ +# define DEFAULT_MEMCMP __memcmp_sse2 +# define DEFAULT_STRLEN __strlen_sse2 +# else +# define DEFAULT_MEMCMP __memcmp_ia32 +# define DEFAULT_STRLEN strlen +# endif +extern __typeof (memcmp) DEFAULT_MEMCMP; +extern __typeof (strlen) DEFAULT_STRLEN; +# else +# define DEFAULT_MEMCMP memcmp +# define DEFAULT_STRLEN strlen +# endif + +# define CHECK_GLIBC_IFUNC_CPU_OFF(f, cpu_features, name, len) \ + _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ + if (!DEFAULT_MEMCMP (f, #name, len)) \ + { \ + cpu_features->cpuid[index_cpu_##name].reg_##name \ + &= ~bit_cpu_##name; \ + break; \ + } + +/* Disable an ARCH feature NAME. We don't enable an ARCH feature which + isn't available. */ +# define CHECK_GLIBC_IFUNC_ARCH_OFF(f, cpu_features, name, len) \ + _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ + if (!DEFAULT_MEMCMP (f, #name, len)) \ + { \ + cpu_features->feature[index_arch_##name] \ + &= ~bit_arch_##name; \ + break; \ + } + +/* Enable/disable an ARCH feature NAME. */ +# define CHECK_GLIBC_IFUNC_ARCH_BOTH(f, cpu_features, name, disable, \ + len) \ + _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ + if (!DEFAULT_MEMCMP (f, #name, len)) \ + { \ + if (disable) \ + cpu_features->feature[index_arch_##name] \ + &= ~bit_arch_##name; \ + else \ + cpu_features->feature[index_arch_##name] \ + |= bit_arch_##name; \ + break; \ + } + +/* Enable/disable an ARCH feature NAME. Enable an ARCH feature only + if the ARCH feature NEED is also enabled. */ +# define CHECK_GLIBC_IFUNC_ARCH_NEED_ARCH_BOTH(f, cpu_features, name, \ + need, disable, len) \ + _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ + if (!DEFAULT_MEMCMP (f, #name, len)) \ + { \ + if (disable) \ + cpu_features->feature[index_arch_##name] \ + &= ~bit_arch_##name; \ + else if (CPU_FEATURES_ARCH_P (cpu_features, need)) \ + cpu_features->feature[index_arch_##name] \ + |= bit_arch_##name; \ + break; \ + } + +/* Enable/disable an ARCH feature NAME. Enable an ARCH feature only + if the CPU feature NEED is also enabled. */ +# define CHECK_GLIBC_IFUNC_ARCH_NEED_CPU_BOTH(f, cpu_features, name, \ + need, disable, len) \ + _Static_assert (sizeof (#name) - 1 == len, #name " != " #len); \ + if (!DEFAULT_MEMCMP (f, #name, len)) \ + { \ + if (disable) \ + cpu_features->feature[index_arch_##name] \ + &= ~bit_arch_##name; \ + else if (CPU_FEATURES_CPU_P (cpu_features, need)) \ + cpu_features->feature[index_arch_##name] \ + |= bit_arch_##name; \ + break; \ + } + +attribute_hidden +void +TUNABLE_CALLBACK (set_ifunc) (tunable_val_t *valp) +{ + /* The current IFUNC selection is based on microbenchmarks in glibc. + It should give the best performance for most workloads. But other + choices may have better performance for a particular workload or on + the hardware which wasn't available when the selection was made. + The environment variable, GLIBC_IFUNC=-xxx,yyy,-zzz...., can be + used to enable CPU/ARCH feature yyy, disable CPU/ARCH feature yyy + and zzz, where the feature name is case-sensitive and has to match + the ones in cpu-features.h. It can be used by glibc developers to + tune for a new processor or override the IFUNC selection to improve + performance for a particular workload. + + Since all CPU/ARCH features are hardware optimizations without + security implication, except for Prefer_MAP_32BIT_EXEC, which can + only be disabled, we check GLIBC_IFUNC for programs, including + set*id ones. + + NOTE: the IFUNC selection may change over time. Please check all + multiarch implementations when experimenting. */ + + const char *p = valp->strval; + struct cpu_features *cpu_features = &GLRO(dl_x86_cpu_features); + const char *end = p + DEFAULT_STRLEN (p); + size_t len; + + do + { + const char *c, *n; + bool disable; + size_t nl; + + for (c = p; *c != ','; c++) + if (c >= end) + break; + + len = c - p; + disable = *p == '-'; + if (disable) + { + n = p + 1; + nl = len - 1; + } + else + { + n = p; + nl = len; + } + switch (nl) + { + default: + break; + case 3: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX, 3); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, CX8, 3); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, FMA, 3); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, HTT, 3); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, RTM, 3); + } + break; + case 4: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX2, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, BMI1, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, BMI2, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, CMOV, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, ERMS, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, FMA4, 4); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE2, 4); + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, I586, 4); + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, I686, 4); + } + break; + case 5: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, LZCNT, 5); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, MOVBE, 5); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSSE3, 5); + } + break; + case 6: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, POPCNT, 6); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_1, 6); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, SSE4_2, 6); + } + break; + case 7: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512F, 7); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, OSXSAVE, 7); + } + break; + case 8: + if (disable) + { + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512CD, 8); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512BW, 8); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512DQ, 8); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512ER, 8); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512PF, 8); + CHECK_GLIBC_IFUNC_CPU_OFF (n, cpu_features, AVX512VL, 8); + } + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, Slow_BSF, + disable, 8); + break; + case 10: + if (disable) + { + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, AVX_Usable, + 10); + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, FMA_Usable, + 10); + } + break; + case 11: + if (disable) + { + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, AVX2_Usable, + 11); + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, FMA4_Usable, + 11); + } + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, Prefer_ERMS, + disable, 11); + CHECK_GLIBC_IFUNC_ARCH_NEED_CPU_BOTH (n, cpu_features, + Slow_SSE4_2, SSE4_2, + disable, 11); + break; + case 14: + if (disable) + { + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, + AVX512F_Usable, 14); + } + break; + case 15: + if (disable) + { + CHECK_GLIBC_IFUNC_ARCH_OFF (n, cpu_features, + AVX512DQ_Usable, 15); + } + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, Fast_Rep_String, + disable, 15); + break; + case 16: + { + CHECK_GLIBC_IFUNC_ARCH_NEED_ARCH_BOTH + (n, cpu_features, Prefer_No_AVX512, AVX512F_Usable, + disable, 16); + } + break; + case 18: + { + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, + Fast_Copy_Backward, disable, + 18); + } + break; + case 19: + { + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, + Fast_Unaligned_Load, disable, + 19); + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, + Fast_Unaligned_Copy, disable, + 19); + } + break; + case 20: + { + CHECK_GLIBC_IFUNC_ARCH_NEED_ARCH_BOTH + (n, cpu_features, Prefer_No_VZEROUPPER, AVX_Usable, + disable, 20); + } + break; + case 21: + { + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, + Prefer_MAP_32BIT_EXEC, disable, + 21); + } + break; + case 23: + { + CHECK_GLIBC_IFUNC_ARCH_NEED_ARCH_BOTH + (n, cpu_features, AVX_Fast_Unaligned_Load, AVX_Usable, + disable, 23); + } + break; + case 26: + { + CHECK_GLIBC_IFUNC_ARCH_NEED_CPU_BOTH + (n, cpu_features, Prefer_PMINUB_for_stringop, SSE2, + disable, 26); + } + break; + case 27: + { + CHECK_GLIBC_IFUNC_ARCH_BOTH (n, cpu_features, + Use_dl_runtime_resolve_slow, + disable, 27); + } + break; + } + p += len + 1; + } + while (p < end); +} +#endif |