libitm: Optimize undo log.

	libitm/
	* local.cc (GTM_LB): Use GTM::gtm_undolog.
	(GTM::gtm_thread::drop_references_undolog): Remove.
	(GTM::gtm_thread::commit_undolog,
	GTM::gtm_thread::rollback_undolog): Move to ...
	* libitm_i.h (GTM::gtm_undolog): ...here. New.
	(GTM::gtm_undolog_entry): Remove.
	(GTM::gtm_thread): Adapt.
	* beginend.cc (GTM::gtm_thread::rollback): Adapt.
	(GTM::gtm_thread::trycommit): Adapt.
	* method-serial.cc (serial_dispatch::log): Adapt.
	* method-gl.cc (gl_wt_dispatch::pre_write): Adapt.
	(gl_wt_dispatch::store): Fix likely/unlikely.
	* containers.h (GTM::vector::resize): Add additional_capacity
	parameter and handle it.
	(GTM::vector::resize_noinline): New/adapt.
	(GTM::vector::push): New.

From-SVN: r182992

1 files changed, 22 insertions, 6 deletions

diff --git a/libitm/containers.h b/libitm/containers.h
index e8aa94bb4f4..394b6f2508e 100644
--- a/libitm/containers.h
+++ b/libitm/containers.h
@@ -1,4 +1,4 @@
-/* Copyright (C) 2011 Free Software Foundation, Inc.
+/* Copyright (C) 2011, 2012 Free Software Foundation, Inc.
    Contributed by Torvald Riegel <triegel@redhat.com>.
 
    This file is part of the GNU Transactional Memory Library (libitm).
@@ -70,17 +70,24 @@ class vector
   }
   ~vector<T, alloc_separate_cl>() { if (m_capacity) free(entries); }
 
-  void resize()
+  void resize(size_t additional_capacity)
   {
-    if (m_capacity >= default_resize_max)
-      m_capacity = m_capacity + default_resize_max;
+    size_t target = m_capacity + additional_capacity;
+    if (target > default_resize_max)
+      m_capacity = ((target - 1 + default_resize_max) / default_resize_max)
+        * default_resize_max;
     else
-      m_capacity = m_capacity * 2;
+      while (m_capacity < target)
+        m_capacity = m_capacity * 2;
     if (m_capacity < default_resize_min)
       m_capacity = default_resize_min;
     entries = (T*) xrealloc(entries, sizeof(T) * m_capacity, alloc_separate_cl);
   }
-  void resize_noinline() __attribute__((noinline)) { resize(); }
+  void resize_noinline() __attribute__((noinline)) { resize(1); }
+  void resize_noinline(size_t elements) __attribute__((noinline))
+  {
+    resize(elements);
+  }
 
   size_t size() const { return m_size; }
   size_t capacity() const { return this->capacity; }
@@ -93,6 +100,15 @@ class vector
     return &entries[m_size++];
   }
 
+  iterator push(size_t elements)
+  {
+    // We don't want inlining here since push() is often on the fast path.
+    if (unlikely(m_size + elements > m_capacity)) resize_noinline(elements);
+    iterator it = &entries[m_size];
+    m_size += elements;
+    return it;
+  }
+
   iterator pop() {
     if (likely(m_size > 0))
       {