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Set the glibc MMAP limit to a static value to avoid the dynamic limit

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2009-02-17  Alexander Larsson  <alexl@redhat.com>

        * configure.in:
        * src/nautilus-main.c:
	Set the glibc MMAP limit to a static value to avoid the dynamic
	limit hitting bad behaviour due to the large temporary allocations
	when creating the desktop background. It would raise the limit
	to a large value causing several large allocations on the
	heap which are then not returned to the OS.


svn path=/trunk/; revision=14963
This commit is contained in:
Alexander Larsson 2009-02-17 10:55:00 +00:00 committed by Alexander Larsson
parent 4dd81c63bb
commit fbe7bdd104
3 changed files with 29 additions and 2 deletions
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10
ChangeLog
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@ -1,3 +1,13 @@
2009-02-17 Alexander Larsson <alexl@redhat.com>
* configure.in:
* src/nautilus-main.c:
Set the glibc MMAP limit to a static value to avoid the dynamic
limit hitting bad behaviour due to the large temporary allocations
when creating the desktop background. It would raise the limit
to a large value causing several large allocations on the
heap which are then not returned to the OS.
2009-02-16 Alexander Larsson <alexl@redhat.com>
* configure.in:

4
configure.in
View file

@ -110,11 +110,11 @@ AC_PATH_PROG(GLIB_GENMARSHAL, glib-genmarshal)
dnl ==========================================================================
AC_CHECK_HEADERS(sys/mount.h sys/vfs.h sys/param.h)
AC_CHECK_HEADERS(sys/mount.h sys/vfs.h sys/param.h malloc.h)
dnl ==========================================================================
AC_CHECK_FUNCS(statfs statvfs)
AC_CHECK_FUNCS(statfs statvfs mallopt)
AC_CHECK_HEADERS(sys/statfs.h sys/statvfs.h)
dnl

17
src/nautilus-main.c
View file

@ -54,6 +54,9 @@
#ifdef HAVE_LOCALE_H
#include <locale.h>
#endif
#ifdef HAVE_MALLOC_H
#include <malloc.h>
#endif
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
@ -342,6 +345,20 @@ main (int argc, char *argv[])
{ NULL }
};
#if defined (HAVE_MALLOPT) && defined(M_MMAP_THRESHOLD)
/* Nautilus uses lots and lots of small and medium size allocations,
* and then a few large ones for the desktop background. By default
* glibc uses a dynamic treshold for how large allocations should
* be mmaped. Unfortunately this triggers quickly for nautilus when
* it does the desktop background allocations, raising the limit
* such that a lot of temporary large allocations end up on the
* heap and are thus not returned to the OS. To fix this we set
* a hardcoded limit. I don't know what a good value is, but 128K
* was the old glibc static limit, lets use that.
*/
mallopt (M_MMAP_THRESHOLD, 128 *1024);
#endif
g_thread_init (NULL);
/* This will be done by gtk+ later, but for now, force it to GNOME */