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2001-08-11  Ulrich Drepper  <drepper@redhat.com>

	* malloc/malloc.c (ptmalloc_init): Don't call getenv five times.
	Instead use new function next_env_entry which iterates over the
	environment once.

	* sysdeps/arm/dl-machine.h (elf_machine_runtime_setup): Only set
	_dl_profile_map for the right object.

	* elf/dl-reloc.c (_dl_relocate_object): Allocate l_reloc_result
	only if consider_profiling is != 0, not if _dl_profile != NULL.

	* sysdeps/generic/dl-environ.c (_dl_next_ld_env_entry): Optimize a bit.
	Now returns pointer to first character set "LD_".
	* elf/rtld.c (process_envvars): Adjust for change above.
	* sysdeps/unix/sysv/linux/dl-librecon.h (EXTRA_LD_ENVVARS): Likewise.
	* sysdeps/unix/sysv/linux/i386/dl-librecon.h (EXTRA_LD_ENVVARS):
	Likewise.

2001-08-10  Wolfram Gloger  <wg@malloc.de>

	* malloc/malloc.c (grow_heap): Use mmap() rather than mprotect()
	to allocate new memory, for better performance with Linux-2.4.x.
This commit is contained in:
Ulrich Drepper
2001-08-11 08:57:41 +00:00
parent 6ae9b99ef2
commit 67c94753e3
8 changed files with 167 additions and 52 deletions
Download Patch File Download Diff File Expand all files Collapse all files

89
malloc/malloc.c
View File

@ -1680,6 +1680,42 @@ ptmalloc_init_all __MALLOC_P((void))
static void ptmalloc_init __MALLOC_P ((void)) __attribute__ ((constructor));
#endif
#ifdef _LIBC
#include <string.h>
extern char **_environ;
static char *
internal_function
next_env_entry (char ***position)
{
char **current = *position;
char *result = NULL;
while (*current != NULL)
{
if (__builtin_expect ((*current)[0] == 'M', 0)
&& (*current)[1] == 'A'
&& (*current)[2] == 'L'
&& (*current)[3] == 'L'
&& (*current)[4] == 'O'
&& (*current)[5] == 'C'
&& (*current)[6] == '_')
{
result = &(*current)[7];
/* Save current position for next visit. */
*position = ++current;
break;
}
++current;
}
return result;
}
#endif
static void
ptmalloc_init __MALLOC_P((void))
#else
@ -1728,6 +1764,52 @@ ptmalloc_init __MALLOC_P((void))
__free_hook = save_free_hook;
#endif
secure = __libc_enable_secure;
#ifdef _LIBC
s = NULL;
{
char **runp = _environ;
char *envline;
while (__builtin_expect ((envline = next_env_entry (&runp)) != NULL,
0))
{
size_t len = strcspn (envline, "=");
if (envline[len] != '=')
/* This is a "MALLOC_" variable at the end of the string
without a '=' character. Ignore it since otherwise we
will access invalid memory below. */
continue;
switch (len)
{
case 6:
if (memcmp (envline, "CHECK_", 6) == 0)
s = &envline[7];
break;
case 8:
if (! secure && memcmp (envline, "TOP_PAD_", 8) == 0)
mALLOPt(M_TOP_PAD, atoi(&envline[9]));
break;
case 9:
if (! secure && memcmp (envline, "MMAP_MAX_", 9) == 0)
mALLOPt(M_MMAP_MAX, atoi(&envline[10]));
break;
case 15:
if (! secure)
{
if (memcmp (envline, "TRIM_THRESHOLD_", 15) == 0)
mALLOPt(M_TRIM_THRESHOLD, atoi(&envline[16]));
else if (memcmp (envline, "MMAP_THRESHOLD_", 15) == 0)
mALLOPt(M_MMAP_THRESHOLD, atoi(&envline[16]));
}
break;
default:
break;
}
}
}
#else
if (! secure)
{
if((s = getenv("MALLOC_TRIM_THRESHOLD_")))
@ -1740,6 +1822,7 @@ ptmalloc_init __MALLOC_P((void))
mALLOPt(M_MMAP_MAX, atoi(s));
}
s = getenv("MALLOC_CHECK_");
#endif
if(s) {
if(s[0]) mALLOPt(M_CHECK_ACTION, (int)(s[0] - '0'));
__malloc_check_init();
@ -2050,7 +2133,8 @@ new_heap(size) size_t size;
return 0;
}
}
if(mprotect(p2, size, PROT_READ|PROT_WRITE) != 0) {
if(MMAP(p2, size, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED)
== (char *) MAP_FAILED) {
munmap(p2, HEAP_MAX_SIZE);
return 0;
}
@ -2078,7 +2162,8 @@ grow_heap(h, diff) heap_info *h; long diff;
new_size = (long)h->size + diff;
if(new_size > HEAP_MAX_SIZE)
return -1;
if(mprotect((char *)h + h->size, diff, PROT_READ|PROT_WRITE) != 0)
if(MMAP((char *)h + h->size, diff, PROT_READ|PROT_WRITE,
MAP_PRIVATE|MAP_FIXED) == (char *) MAP_FAILED)
return -2;
} else {
new_size = (long)h->size + diff;