diff options
| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | sysdeps/x86/cacheinfo.c | 12 |
2 files changed, 16 insertions, 1 deletions
@@ -1,3 +1,8 @@ +2016-05-13 H.J. Lu <hongjiu.lu@intel.com> + + * sysdeps/x86/cacheinfo.c (init_cacheinfo): Check and support + non-inclusive caches on Intel processors. + 2016-05-13 Florian Weimer <fweimer@redhat.com> * malloc/malloc.c (dumped_main_arena_start) diff --git a/sysdeps/x86/cacheinfo.c b/sysdeps/x86/cacheinfo.c index 143b3333a8..8408624ea4 100644 --- a/sysdeps/x86/cacheinfo.c +++ b/sysdeps/x86/cacheinfo.c @@ -492,6 +492,9 @@ init_cacheinfo (void) { data = handle_intel (_SC_LEVEL1_DCACHE_SIZE, max_cpuid); + long int core = handle_intel (_SC_LEVEL2_CACHE_SIZE, max_cpuid); + bool inclusive_cache = true; + /* Try L3 first. */ level = 3; shared = handle_intel (_SC_LEVEL3_CACHE_SIZE, max_cpuid); @@ -500,7 +503,7 @@ init_cacheinfo (void) { /* Try L2 otherwise. */ level = 2; - shared = handle_intel (_SC_LEVEL2_CACHE_SIZE, max_cpuid); + shared = core; } /* Figure out the number of logical threads that share the @@ -526,6 +529,9 @@ init_cacheinfo (void) } while (((eax >> 5) & 0x7) != level); + /* Check if cache is inclusive of lower cache levels. */ + inclusive_cache = (edx & 0x2) != 0; + threads = (eax >> 14) & 0x3ff; /* If max_cpuid >= 11, THREADS is the maximum number of @@ -592,6 +598,10 @@ init_cacheinfo (void) threads. */ if (shared > 0 && threads > 0) shared /= threads; + + /* Account for non-inclusive L2 and L3 caches. */ + if (level == 3 && !inclusive_cache) + shared += core; } /* This spells out "AuthenticAMD". */ else if (is_amd) |