Support non-inclusive caches on Intel processors

	* sysdeps/x86/cacheinfo.c (init_cacheinfo): Check and support
	non-inclusive caches on Intel processors.

diff --git a/ChangeLog b/ChangeLog
index 1f8db94e4a9c94c1f12231dd5714f74fa01fd20b..05d0fe7b5e9d900b8713c208b5bc88891118af00 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -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 143b3333a8592a5f1d1a94539387b46e0b663ab1..8408624ea41f743a84ef05f8058e8d9887dabef8 100644 (file)
--- 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)