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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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
ChangeLog
View File

@ -1,3 +1,27 @@
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.
2001-08-10 Ulrich Drepper <drepper@redhat.com>
* posix/getopt_init.c (__getopt_clean_environment): Avoid making

2
elf/dl-reloc.c
View File

@ -91,7 +91,7 @@ cannot make segment writable for relocation"));
#include "dynamic-link.h"
ELF_DYNAMIC_RELOCATE (l, lazy, consider_profiling);
if (__builtin_expect (_dl_profile != NULL, 0))
if (__builtin_expect (consider_profiling, 0))
{
/* Allocate the array which will contain the already found
relocations. If the shared object lacks a PLT (for example

62
elf/rtld.c
View File

@ -1282,10 +1282,12 @@ warning: debug option `%s' unknown; try LD_DEBUG=help\n", startp);
/* Process all environments variables the dynamic linker must recognize.
Since all of them start with `LD_' we are a bit smarter while finding
all the entries. */
extern char **_environ;
static void
process_envvars (enum mode *modep)
{
char **runp = NULL;
char **runp = _environ;
char *envline;
enum mode mode = normal;
char *debug_output = NULL;
@ -1301,98 +1303,98 @@ process_envvars (enum mode *modep)
/* This is a "LD_" variable at the end of the string without
a '=' character. Ignore it since otherwise we will access
invalid memory below. */
break;
continue;
switch (len - 3)
switch (len)
{
case 4:
/* Warning level, verbose or not. */
if (memcmp (&envline[3], "WARN", 4) == 0)
_dl_verbose = envline[8] != '\0';
if (memcmp (envline, "WARN", 4) == 0)
_dl_verbose = envline[5] != '\0';
break;
case 5:
/* Debugging of the dynamic linker? */
if (memcmp (&envline[3], "DEBUG", 5) == 0)
process_dl_debug (&envline[9]);
if (memcmp (envline, "DEBUG", 5) == 0)
process_dl_debug (&envline[6]);
break;
case 7:
/* Print information about versions. */
if (memcmp (&envline[3], "VERBOSE", 7) == 0)
if (memcmp (envline, "VERBOSE", 7) == 0)
{
version_info = envline[11] != '\0';
version_info = envline[8] != '\0';
break;
}
/* List of objects to be preloaded. */
if (memcmp (&envline[3], "PRELOAD", 7) == 0)
if (memcmp (envline, "PRELOAD", 7) == 0)
{
preloadlist = &envline[11];
preloadlist = &envline[8];
break;
}
/* Which shared object shall be profiled. */
if (memcmp (&envline[3], "PROFILE", 7) == 0)
_dl_profile = &envline[11];
if (memcmp (envline, "PROFILE", 7) == 0)
_dl_profile = &envline[8];
break;
case 8:
/* Do we bind early? */
if (memcmp (&envline[3], "BIND_NOW", 8) == 0)
if (memcmp (envline, "BIND_NOW", 8) == 0)
{
_dl_lazy = envline[12] == '\0';
_dl_lazy = envline[9] == '\0';
break;
}
if (memcmp (&envline[3], "BIND_NOT", 8) == 0)
_dl_bind_not = envline[12] != '\0';
if (memcmp (envline, "BIND_NOT", 8) == 0)
_dl_bind_not = envline[9] != '\0';
break;
case 9:
/* Test whether we want to see the content of the auxiliary
array passed up from the kernel. */
if (memcmp (&envline[3], "SHOW_AUXV", 9) == 0)
if (memcmp (envline, "SHOW_AUXV", 9) == 0)
_dl_show_auxv ();
break;
case 10:
/* Mask for the important hardware capabilities. */
if (memcmp (&envline[3], "HWCAP_MASK", 10) == 0)
_dl_hwcap_mask = __strtoul_internal (&envline[14], NULL, 0, 0);
if (memcmp (envline, "HWCAP_MASK", 10) == 0)
_dl_hwcap_mask = __strtoul_internal (&envline[11], NULL, 0, 0);
break;
case 11:
/* Path where the binary is found. */
if (!__libc_enable_secure
&& memcmp (&envline[3], "ORIGIN_PATH", 11) == 0)
_dl_origin_path = &envline[15];
&& memcmp (envline, "ORIGIN_PATH", 11) == 0)
_dl_origin_path = &envline[12];
break;
case 12:
/* The library search path. */
if (memcmp (&envline[3], "LIBRARY_PATH", 12) == 0)
if (memcmp (envline, "LIBRARY_PATH", 12) == 0)
{
library_path = &envline[16];
library_path = &envline[13];
break;
}
/* Where to place the profiling data file. */
if (memcmp (&envline[3], "DEBUG_OUTPUT", 12) == 0)
if (memcmp (envline, "DEBUG_OUTPUT", 12) == 0)
{
debug_output = &envline[16];
debug_output = &envline[13];
break;
}
if (memcmp (&envline[3], "DYNAMIC_WEAK", 12) == 0)
if (memcmp (envline, "DYNAMIC_WEAK", 12) == 0)
_dl_dynamic_weak = 1;
break;
case 14:
/* Where to place the profiling data file. */
if (!__libc_enable_secure
&& memcmp (&envline[3], "PROFILE_OUTPUT", 14) == 0)
&& memcmp (envline, "PROFILE_OUTPUT", 14) == 0)
{
_dl_profile_output = &envline[18];
_dl_profile_output = &envline[15];
if (*_dl_profile_output == '\0')
_dl_profile_output = "/var/tmp";
}
@ -1400,7 +1402,7 @@ process_envvars (enum mode *modep)
case 20:
/* The mode of the dynamic linker can be set. */
if (memcmp (&envline[3], "TRACE_LOADED_OBJECTS", 20) == 0)
if (memcmp (envline, "TRACE_LOADED_OBJECTS", 20) == 0)
mode = trace;
break;

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;

7
sysdeps/arm/dl-machine.h
View File

@ -103,8 +103,11 @@ elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
if (profile)
{
got[2] = (Elf32_Addr) &_dl_runtime_profile;
/* Say that we really want profiling and the timers are started. */
_dl_profile_map = l;
if (_dl_name_match_p (_dl_profile, l))
/* Say that we really want profiling and the timers are
started. */
_dl_profile_map = l;
}
else
/* This function will get called to fix up the GOT entry indicated by

23
sysdeps/generic/dl-environ.c
View File

@ -1,5 +1,5 @@
/* Environment handling for dynamic loader.
Copyright (C) 1995, 1996, 1997, 1998, 2000 Free Software Foundation, Inc.
Copyright (C) 1995-1998, 2000, 2001 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
@ -32,21 +32,22 @@ _dl_next_ld_env_entry (char ***position)
char **current = *position;
char *result = NULL;
if (current == NULL)
/* We start over. */
current = _environ;
while (result == NULL && *current != NULL)
while (*current != NULL)
{
if ((*current)[0] == 'L' && (*current)[1] == 'D' && (*current)[2] == '_')
result = *current;
if (__builtin_expect ((*current)[0] == 'L', 0)
&& (*current)[1] == 'D' && (*current)[2] == '_')
{
result = &(*current)[3];
/* Save current position for next visit. */
*position = ++current;
break;
}
++current;
}
/* Save current position for next visit. */
*position = current;
return result;
}

4
sysdeps/unix/sysv/linux/dl-librecon.h
View File

@ -24,10 +24,10 @@
/* Recognizing extra environment variables. */
#define EXTRA_LD_ENVVARS \
case 13: \
if (memcmp (&envline[3], "ASSUME_KERNEL", 13) == 0) \
if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \
{ \
unsigned long int i, j, osversion = 0; \
char *p = &envline[17], *q; \
char *p = &envline[14], *q; \
\
for (i = 0; i < 3; i++, p = q + 1) \
{ \

8
sysdeps/unix/sysv/linux/i386/dl-librecon.h
View File

@ -49,10 +49,10 @@
/* Recognizing extra environment variables. */
#define EXTRA_LD_ENVVARS \
case 13: \
if (memcmp (&envline[3], "ASSUME_KERNEL", 13) == 0) \
if (memcmp (envline, "ASSUME_KERNEL", 13) == 0) \
{ \
unsigned long int i, j, osversion = 0; \
char *p = &envline[17], *q; \
char *p = &envline[14], *q; \
\
for (i = 0; i < 3; i++, p = q + 1) \
{ \
@ -72,9 +72,9 @@
} \
\
case 15: \
if (memcmp (&envline[3], "LIBRARY_VERSION", 15) == 0) \
if (memcmp (envline, "LIBRARY_VERSION", 15) == 0) \
{ \
_dl_correct_cache_id = envline[19] == '5' ? 2 : 3; \
_dl_correct_cache_id = envline[16] == '5' ? 2 : 3; \
break; \
}