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| author | Corinna Vinschen <corinna@vinschen.de> | 2015-08-29 09:16:47 +0200 |
|---|---|---|
| committer | Corinna Vinschen <corinna@vinschen.de> | 2015-08-29 09:16:47 +0200 |
| commit | 38fd7ddb790609db3e91540d183fb8b62250d969 (patch) | |
| tree | d4e89397a7d1f80da69e79bbf7752633ae2f9507 /winsup/doc/new-features.xml | |
| parent | 35d5d87540c3262c341c35e974d0d3a53ce30684 (diff) | |
| download | cygnal-38fd7ddb790609db3e91540d183fb8b62250d969.tar.gz cygnal-38fd7ddb790609db3e91540d183fb8b62250d969.tar.bz2 cygnal-38fd7ddb790609db3e91540d183fb8b62250d969.zip | |
Allow sysconf to return CPU cache information
* 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>
Diffstat (limited to 'winsup/doc/new-features.xml')
| -rw-r--r-- | winsup/doc/new-features.xml | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/winsup/doc/new-features.xml b/winsup/doc/new-features.xml index edd19633f..fc53b0138 100644 --- a/winsup/doc/new-features.xml +++ b/winsup/doc/new-features.xml @@ -16,6 +16,17 @@ posix_madvise(POSIX_MADV_DONTNEED) now utilizes OS functionality available starting with Windows 8.1/Server 2012R2. </para></listitem> +<listitem><para> +sysconf() now supports returning CPU cache information: + <screen> + _SC_LEVEL1_ICACHE_SIZE, _SC_LEVEL1_ICACHE_ASSOC, _SC_LEVEL1_ICACHE_LINESIZE, + _SC_LEVEL1_DCACHE_SIZE, _SC_LEVEL1_DCACHE_ASSOC, _SC_LEVEL1_DCACHE_LINESIZE, + _SC_LEVEL2_CACHE_SIZE, _SC_LEVEL2_CACHE_ASSOC, _SC_LEVEL2_CACHE_LINESIZE, + _SC_LEVEL3_CACHE_SIZE, _SC_LEVEL3_CACHE_ASSOC, _SC_LEVEL3_CACHE_LINESIZE, + _SC_LEVEL4_CACHE_SIZE, _SC_LEVEL4_CACHE_ASSOC, _SC_LEVEL4_CACHE_LINESIZE + </screen> +</para></listitem> + </itemizedlist> </sect2> |