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bpo-37737: mmap module, track anonymous paging case on macOS #15068

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bpo-37737: mmap module, track anonymous paging case on macOS #15068

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1c8906f
mmap module, track anonymous paging case on macOS
devnexen Aug 1, 2019
d13daac
📜🤖 Added by blurb_it.
blurb-it[bot] Aug 1, 2019
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1 change: 1 addition & 0 deletions Misc/NEWS.d/next/macOS/2019-08-01-13-52-52.bpo-37737.1HE5BK.rst
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@@ -0,0 +1 @@
on macOS, anonymous paging cases can be tracked via tooling as vmmap.
9 changes: 9 additions & 0 deletions Modules/mmapmodule.c
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Expand Up @@ -54,6 +54,11 @@ my_getallocationgranularity (void)
#include <sys/mman.h>
#include <sys/stat.h>

#ifdef __APPLE__
#include <mach/vm_statistics.h>
# define MAP_ANON_ID 244
#endif

#if defined(HAVE_SYSCONF) && defined(_SC_PAGESIZE)
static int
my_getpagesize(void)
Expand Down Expand Up @@ -1212,6 +1217,10 @@ new_mmap_object(PyTypeObject *type, PyObject *args, PyObject *kwdict)
#ifdef MAP_ANONYMOUS
/* BSD way to map anonymous memory */
flags |= MAP_ANONYMOUS;
#ifdef __APPLE__
/* Darwin allows to tag anonymous memory */
fd = VM_MAKE_TAG(MAP_ANON_ID);
#endif

/* VxWorks only supports MAP_ANONYMOUS with MAP_PRIVATE flag */
#ifdef __VXWORKS__
Expand Down