[Sanitizers] Increase allocated chunk limit for LargeMmapAllocator

Summary:
There are applications out there which allocate more than 1 << 18 large chunks
of memory (those handled by LargeMmapAllocator, aka secondary allocator).

For 64 bits, secondary allocator stores allocated chunks in a growing on
demand region of memory, growing in blocks of 128K, up to 1 << 20 chunks total.

Sanitizer internal allocator's secondary uses fixed size array storing up
to 1 << 15 chunks (down to 256K from 2Mb of memory used for that array).

Nothing is changed for 32 bits, chunks are still stored in the fixed size
array (up to 1 << 15 chunks).

Reviewers: eugenis

Subscribers: kubamracek, delcypher, #sanitizers, llvm-commits

Differential Revision: https://reviews.llvm.org/D43693

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@326007 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 5 insertions, 2 deletions

diff --git a/lib/sanitizer_common/sanitizer_allocator_internal.h b/lib/sanitizer_common/sanitizer_allocator_internal.h
index 10536a965..2a1fa1d7f 100644
--- a/lib/sanitizer_common/sanitizer_allocator_internal.h
+++ b/lib/sanitizer_common/sanitizer_allocator_internal.h
@@ -46,9 +46,12 @@ typedef SizeClassAllocator32<AP32> PrimaryInternalAllocator;
 typedef SizeClassAllocatorLocalCache<PrimaryInternalAllocator>
     InternalAllocatorCache;
 
+typedef LargeMmapAllocator<NoOpMapUnmapCallback,
+                           LargeMmapAllocatorPtrArrayStatic>
+    SecondaryInternalAllocator;
+
 typedef CombinedAllocator<PrimaryInternalAllocator, InternalAllocatorCache,
-                          LargeMmapAllocator<NoOpMapUnmapCallback>
-                         > InternalAllocator;
+                          SecondaryInternalAllocator> InternalAllocator;
 
 void *InternalAlloc(uptr size, InternalAllocatorCache *cache = nullptr,
                     uptr alignment = 0);