svn commit: r325965 - head/libexec/rtld-elf

[Edward Tomasz Napierala]

Author: trasz
Date: Sat Nov 18 13:21:22 2017
New Revision: 325965
URL: https://svnweb.freebsd.org/changeset/base/325965

Log:
  Increase rtld initial memory pool size from 32kB to 128kB.
  
  The old value was probably fine back in 1998, when that code was imported
  (although the comments still mention VAX, which was quite obsolete by then);
  now, however, it's too small to handle our libc, which results in some
  additional calls to munmap/mmap later on.  Asking for more virtual address
  space is virtually free, and syscalls are not, thus the change.
  
  It was suggested by kib@ that this might be a symptom of a deeper problem.
  It doesn't only affect libc, though - the change also improves rtld memory
  management for eg KDE libraries.  I guess it's just a natural bloat.
  
  MFC after:	2 weeks
  Sponsored by:	DARPA, AFRL
  Differential Revision:	https://reviews.freebsd.org/D12834

Modified:
  head/libexec/rtld-elf/malloc.c

Modified: head/libexec/rtld-elf/malloc.c
==============================================================================
--- head/libexec/rtld-elf/malloc.c	Sat Nov 18 11:58:35 2017	(r325964)
+++ head/libexec/rtld-elf/malloc.c	Sat Nov 18 13:21:22 2017	(r325965)
@@ -61,7 +61,7 @@ static int findbucket();
 /*
  * Pre-allocate mmap'ed pages
  */
-#define	NPOOLPAGES	(32*1024/pagesz)
+#define	NPOOLPAGES	(128*1024/pagesz)
 static caddr_t		pagepool_start, pagepool_end;
 static int		morepages();