[pypy-svn] r75756 - pypy/trunk/pypy/rpython/lltypesystem

[fijal at codespeak.net]

Author: fijal
Date: Fri Jul  2 12:52:54 2010
New Revision: 75756

Modified:
   pypy/trunk/pypy/rpython/lltypesystem/rffi.py
Log:
Disable an attempt to allocate a nonmoving buffer. This speeds up twisted's
tests by a considerable margin. Reason - in case we however do copy the buffer,
we end up allocating new and new buffers, collecting every now and then instead
of reusing freelists of C.


Modified: pypy/trunk/pypy/rpython/lltypesystem/rffi.py
==============================================================================
--- pypy/trunk/pypy/rpython/lltypesystem/rffi.py	(original)
+++ pypy/trunk/pypy/rpython/lltypesystem/rffi.py	Fri Jul  2 12:52:54 2010
@@ -642,16 +642,8 @@
         allows for the process to be performed without an extra copy.
         Make sure to call keep_buffer_alive_until_here on the returned values.
         """
-        str_chars_offset = (offsetof(STRTYPE, 'chars') + \
-                            itemoffsetof(STRTYPE.chars, 0))
-        gc_buf = rgc.malloc_nonmovable(STRTYPE, count)
-        if gc_buf:
-            realbuf = cast_ptr_to_adr(gc_buf) + str_chars_offset
-            raw_buf = cast(TYPEP, realbuf)
-            return raw_buf, gc_buf
-        else:
-            raw_buf = lltype.malloc(TYPEP.TO, count, flavor='raw')
-            return raw_buf, lltype.nullptr(STRTYPE)
+        raw_buf = lltype.malloc(TYPEP.TO, count, flavor='raw')
+        return raw_buf, lltype.nullptr(STRTYPE)
     alloc_buffer._always_inline_ = True # to get rid of the returned tuple
 
     # (char*, str, int, int) -> None