add glibc allocator definitions

1 files changed, 25 insertions, 0 deletions

diff --git a/allocators/glibc_2.28_no_passive_falsesharing_fancy.patch b/allocators/glibc_2.28_no_passive_falsesharing_fancy.patch
new file mode 100644
index 0000000..044909b
--- /dev/null
+++ b/allocators/glibc_2.28_no_passive_falsesharing_fancy.patch
@@ -0,0 +1,25 @@
+diff --git a/malloc/malloc.c b/malloc/malloc.c
+index 27cf6137c2..fbd311801d 100644
+--- a/malloc/malloc.c
++++ b/malloc/malloc.c
+@@ -4172,6 +4172,12 @@ _int_free (mstate av, mchunkptr p, int have_lock)
+ 
+ #if USE_TCACHE
+   {
++    /* Check if chunk is from our own arena or false sharing is not possible
++       because the chunk is cache line aligned and it's size is a multiple
++       of a cacheline  */
++    if (av == thread_arena
++        || (((size_t)p & 63) == 0 && ((size + 2*SIZE_SZ) % 64) == 0))
++      {
+     size_t tc_idx = csize2tidx (size);
+     if (tcache != NULL && tc_idx < mp_.tcache_bins)
+       {
+@@ -4201,6 +4207,7 @@ _int_free (mstate av, mchunkptr p, int have_lock)
+ 	    return;
+ 	  }
+       }
++      }
+   }
+ #endif
+