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Allow sysconf to return CPU cache information

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* include/sys/unistd.h (_SC_LEVEL*): Add cache-related variables as
        on Linux.

        * fhandler_proc.cc (format_proc_cpuinfo): Fetch cache information
        from new cache functions in sysconf.cc, get_cpu_cache_intel and
        get_cpu_cache_amd.
        * sysconf.cc (__nt_query_system): New local helper.
        (get_nproc_values): Utilize __nt_query_system on pre-Windows 7 systems.
        Use GetLogicalProcessorInformationEx otherwise to handle more than
        64 CPUs.  Only handle _SC_NPROCESSORS_CONF and _SC_NPROCESSORS_ONLN.
        (get_phys_pages): New helper to handle _SC_PHYS_PAGES.
        (cpuid2_cache_descriptor): New array to map Intel CPUID 2 descriptor
        values to cache type, cache size, associativity and linesize.
        (cpuid2_cache_desc_compar): Comparision function for bsearch over
        cpuid2_cache_descriptor.
        (get_cpu_cache_intel_cpuid2): New function to fetch cache info from
        Intel CPUID 2.
        (get_cpu_cache_intel_cpuid4): Ditto from Intel CPUID 4.
        (get_cpu_cache_intel): New function as CPU-specific entry point.
        (assoc): New array to map associativity values from AMD CPUID
        0x80000006.
        (get_cpu_cache_amd): New function to fetch cache info from AMD CPUIDs
        0x80000005 and 0x80000006.
        (get_cpu_cache): New function to fetch cache info.
        (sca): Call get_phys_pages if _SC_PHYS_PAGES is requested.  Call
        get_cpu_cache for new _SC_* cache requests.
        (SC_MAX): Set to _SC_LEVEL4_CACHE_LINESIZE.
        (get_phys_pages(void)): Call get_phys_pages(int).
        * include/cygwin/version.h (CYGWIN_VERSION_API_MINOR): Bump.

        * new-features.xml (ov-new2.3): Document sysconf cache addition.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen
2015-08-29 09:16:47 +02:00
parent 35d5d87540
commit 38fd7ddb79
9 changed files with 561 additions and 65 deletions
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15
newlib/libc/include/sys/unistd.h
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@ -425,6 +425,21 @@ int _EXFUN(unlinkat, (int, const char *, int));
#define _SC_THREAD_ROBUST_PRIO_INHERIT 122
#define _SC_THREAD_ROBUST_PRIO_PROTECT 123
#define _SC_XOPEN_UUCP 124
#define _SC_LEVEL1_ICACHE_SIZE 125
#define _SC_LEVEL1_ICACHE_ASSOC 126
#define _SC_LEVEL1_ICACHE_LINESIZE 127
#define _SC_LEVEL1_DCACHE_SIZE 128
#define _SC_LEVEL1_DCACHE_ASSOC 129
#define _SC_LEVEL1_DCACHE_LINESIZE 130
#define _SC_LEVEL2_CACHE_SIZE 131
#define _SC_LEVEL2_CACHE_ASSOC 132
#define _SC_LEVEL2_CACHE_LINESIZE 133
#define _SC_LEVEL3_CACHE_SIZE 134
#define _SC_LEVEL3_CACHE_ASSOC 135
#define _SC_LEVEL3_CACHE_LINESIZE 136
#define _SC_LEVEL4_CACHE_SIZE 137
#define _SC_LEVEL4_CACHE_ASSOC 138
#define _SC_LEVEL4_CACHE_LINESIZE 139
/*
* pathconf values per IEEE Std 1003.1, 2008 Edition