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[src/trunk]: src Export the guard size of the main thread via vm.guard_size. ...
details: https://anonhg.NetBSD.org/src/rev/1a1e609806d6
branches: trunk
changeset: 825178:1a1e609806d6
user: joerg <joerg%NetBSD.org@localhost>
date: Sun Jul 02 16:41:32 2017 +0000
description:
Export the guard size of the main thread via vm.guard_size. Add a
complementary writable sysctl for the initial guard size of threads
created via pthread_create. Let the existing attribut accessors do the
right thing. Raise the default guard size for threads to 64KB.
diffstat:
lib/libpthread/TODO | 6 +----
lib/libpthread/pthread.c | 37 +++++++++++++++++++++++++----
lib/libpthread/pthread_attr.c | 8 +++---
lib/libpthread/pthread_attr_getguardsize.3 | 13 ++++------
lib/libpthread/pthread_int.h | 3 +-
sys/kern/exec_subr.c | 7 +++--
sys/uvm/uvm_meter.c | 16 +++++++++++-
sys/uvm/uvm_param.h | 9 +++++-
tests/lib/libpthread/t_join.c | 9 ++++--
9 files changed, 74 insertions(+), 34 deletions(-)
diffs (truncated from 373 to 300 lines):
diff -r a4deddfd0a6c -r 1a1e609806d6 lib/libpthread/TODO
--- a/lib/libpthread/TODO Sun Jul 02 16:19:46 2017 +0000
+++ b/lib/libpthread/TODO Sun Jul 02 16:41:32 2017 +0000
@@ -1,13 +1,9 @@
-$NetBSD: TODO,v 1.18 2017/02/08 03:44:41 kamil Exp $
+$NetBSD: TODO,v 1.19 2017/07/02 16:41:32 joerg Exp $
Interfaces/features to implement:
- Realtime extensions: priority inheritance.
-- Allow threads to change their stack size.
-
-- Allow threads to modify the red zone size; cf. pthread_attr_setguardsize(3).
-
- Keep a pool of dead LWPs so that we do not have take the full hit of
_lwp_create() every time pthread_create() is called.
diff -r a4deddfd0a6c -r 1a1e609806d6 lib/libpthread/pthread.c
--- a/lib/libpthread/pthread.c Sun Jul 02 16:19:46 2017 +0000
+++ b/lib/libpthread/pthread.c Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread.c,v 1.147 2015/05/29 16:05:13 christos Exp $ */
+/* $NetBSD: pthread.c,v 1.148 2017/07/02 16:41:32 joerg Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread.c,v 1.147 2015/05/29 16:05:13 christos Exp $");
+__RCSID("$NetBSD: pthread.c,v 1.148 2017/07/02 16:41:32 joerg Exp $");
#define __EXPOSE_STACK 1
@@ -40,7 +40,9 @@
#include <sys/lwp.h>
#include <sys/lwpctl.h>
#include <sys/resource.h>
+#include <sys/sysctl.h>
#include <sys/tls.h>
+#include <uvm/uvm_param.h>
#include <assert.h>
#include <dlfcn.h>
@@ -115,6 +117,7 @@
* stack pointer to thread data afterwards.
*/
size_t pthread__stacksize;
+size_t pthread__guardsize;
size_t pthread__pagesize;
static struct __pthread_st *pthread__main;
static size_t __pthread_st_size;
@@ -164,6 +167,9 @@
pthread_t first;
char *p;
int i;
+ int mib[2];
+ unsigned int value;
+ size_t len;
extern int __isthreaded;
/*
@@ -182,6 +188,14 @@
pthread__pagesize = (size_t)sysconf(_SC_PAGESIZE);
pthread__concurrency = (int)sysconf(_SC_NPROCESSORS_CONF);
+ mib[0] = CTL_VM;
+ mib[1] = VM_THREAD_GUARD_SIZE;
+ len = sizeof(value);
+ if (sysctl(mib, __arraycount(mib), &value, &len, NULL, 0) == 0)
+ pthread__guardsize = value;
+ else
+ pthread__guardsize = pthread__pagesize;
+
/* Initialize locks first; they're needed elsewhere. */
pthread__lockprim_init();
for (i = 0; i < NHASHLOCK; i++) {
@@ -335,16 +349,19 @@
if (attr != NULL) {
pthread_attr_getstack(attr, &stackbase, &stacksize);
+ pthread_attr_getguardsize(attr, &guardsize);
} else {
stackbase = NULL;
stacksize = 0;
+ guardsize = pthread__guardsize;
}
if (stacksize == 0)
stacksize = pthread__stacksize;
if (newthread->pt_stack_allocated) {
if (stackbase == NULL &&
- newthread->pt_stack.ss_size == stacksize)
+ newthread->pt_stack.ss_size == stacksize &&
+ newthread->pt_guardsize == guardsize)
return 0;
stackbase2 = newthread->pt_stack.ss_sp;
#ifndef __MACHINE_STACK_GROWS_UP
@@ -362,14 +379,13 @@
if (stackbase == NULL) {
stacksize = ((stacksize - 1) | (pthread__pagesize - 1)) + 1;
- guardsize = pthread__pagesize;
+ guardsize = ((guardsize - 1) | (pthread__pagesize - 1)) + 1;
stackbase = mmap(NULL, stacksize + guardsize,
PROT_READ|PROT_WRITE, MAP_ANON|MAP_PRIVATE, -1, (off_t)0);
if (stackbase == MAP_FAILED)
return ENOMEM;
allocated = true;
} else {
- guardsize = 0;
allocated = false;
}
#ifdef __MACHINE_STACK_GROWS_UP
@@ -1280,7 +1296,9 @@
{
struct rlimit slimit;
const AuxInfo *aux;
- size_t size;
+ size_t size, len;
+ int mib[2];
+ unsigned int value;
_DIAGASSERT(_dlauxinfo() != NULL);
@@ -1289,6 +1307,13 @@
"Couldn't get stack resource consumption limits");
size = slimit.rlim_cur;
pthread__main->pt_stack.ss_size = size;
+ pthread__main->pt_guardsize = pthread__pagesize;
+
+ mib[0] = CTL_VM;
+ mib[1] = VM_GUARD_SIZE;
+ len = sizeof(value);
+ if (sysctl(mib, __arraycount(mib), &value, &len, NULL, 0) == 0)
+ pthread__main->pt_guardsize = value;
for (aux = _dlauxinfo(); aux->a_type != AT_NULL; ++aux) {
if (aux->a_type == AT_STACKBASE) {
diff -r a4deddfd0a6c -r 1a1e609806d6 lib/libpthread/pthread_attr.c
--- a/lib/libpthread/pthread_attr.c Sun Jul 02 16:19:46 2017 +0000
+++ b/lib/libpthread/pthread_attr.c Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread_attr.c,v 1.16 2012/03/02 18:06:05 joerg Exp $ */
+/* $NetBSD: pthread_attr.c,v 1.17 2017/07/02 16:41:32 joerg Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2008 The NetBSD Foundation, Inc.
@@ -30,7 +30,7 @@
*/
#include <sys/cdefs.h>
-__RCSID("$NetBSD: pthread_attr.c,v 1.16 2012/03/02 18:06:05 joerg Exp $");
+__RCSID("$NetBSD: pthread_attr.c,v 1.17 2017/07/02 16:41:32 joerg Exp $");
#include <errno.h>
#include <stdio.h>
@@ -107,7 +107,7 @@
p->ptap_namearg = thread->pt_name;
p->ptap_stackaddr = thread->pt_stack.ss_sp;
p->ptap_stacksize = thread->pt_stack.ss_size;
- p->ptap_guardsize = pthread__pagesize;
+ p->ptap_guardsize = thread->pt_guardsize;
return pthread_getschedparam(thread, &p->ptap_policy, &p->ptap_sp);
}
@@ -150,7 +150,7 @@
struct pthread_attr_private *p;
if ((p = attr->pta_private) == NULL)
- *guard = (size_t)sysconf(_SC_PAGESIZE);
+ *guard = pthread__guardsize;
else
*guard = p->ptap_guardsize;
diff -r a4deddfd0a6c -r 1a1e609806d6 lib/libpthread/pthread_attr_getguardsize.3
--- a/lib/libpthread/pthread_attr_getguardsize.3 Sun Jul 02 16:19:46 2017 +0000
+++ b/lib/libpthread/pthread_attr_getguardsize.3 Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-.\" $NetBSD: pthread_attr_getguardsize.3,v 1.3 2016/04/07 06:21:48 dholland Exp $
+.\" $NetBSD: pthread_attr_getguardsize.3,v 1.4 2017/07/02 16:41:32 joerg Exp $
.\"
.\" Copyright (c) 2010 Jukka Ruohonen <jruohonen%iki.fi@localhost>
.\" All rights reserved.
@@ -25,7 +25,7 @@
.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
.\" POSSIBILITY OF SUCH DAMAGE.
.\"
-.Dd July 7, 2010
+.Dd July 2, 2017
.Dt PTHREAD_ATTR_GETGUARDSIZE 3
.Os
.Sh NAME
@@ -66,12 +66,9 @@
.Nx
the default
.Fa guardsize
-is the system page size.
-(This value is often 4096 bytes but varies on some ports; the
-precise value can be retrieved by using
-.Xr sysconf 3
-with
-.Dv _SC_PAGESIZE . )
+is given by the
+.Pa vm.thread_guard_size
+.Xr sysctl 7 .
.Pp
The rationale behind
.Fa guardsize
diff -r a4deddfd0a6c -r 1a1e609806d6 lib/libpthread/pthread_int.h
--- a/lib/libpthread/pthread_int.h Sun Jul 02 16:19:46 2017 +0000
+++ b/lib/libpthread/pthread_int.h Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: pthread_int.h,v 1.93 2017/02/08 03:44:41 kamil Exp $ */
+/* $NetBSD: pthread_int.h,v 1.94 2017/07/02 16:41:32 joerg Exp $ */
/*-
* Copyright (c) 2001, 2002, 2003, 2006, 2007, 2008 The NetBSD Foundation, Inc.
@@ -171,6 +171,7 @@
#define PT_ATTR_DEAD 0xDEAD0002
extern size_t pthread__stacksize;
+extern size_t pthread__guardsize;
extern size_t pthread__pagesize;
extern int pthread__nspins;
extern int pthread__concurrency;
diff -r a4deddfd0a6c -r 1a1e609806d6 sys/kern/exec_subr.c
--- a/sys/kern/exec_subr.c Sun Jul 02 16:19:46 2017 +0000
+++ b/sys/kern/exec_subr.c Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: exec_subr.c,v 1.81 2017/06/23 21:28:38 joerg Exp $ */
+/* $NetBSD: exec_subr.c,v 1.82 2017/07/02 16:41:33 joerg Exp $ */
/*
* Copyright (c) 1993, 1994, 1996 Christopher G. Demetriou
@@ -31,7 +31,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.81 2017/06/23 21:28:38 joerg Exp $");
+__KERNEL_RCSID(0, "$NetBSD: exec_subr.c,v 1.82 2017/07/02 16:41:33 joerg Exp $");
#include "opt_pax.h"
@@ -67,7 +67,8 @@
#define DPRINTF(a)
#endif
-uint32_t user_stack_guard_size = 1024 * 1024;
+unsigned int user_stack_guard_size = 1024 * 1024;
+unsigned int user_thread_stack_guard_size = 64 * 1024;
/*
* new_vmcmd():
diff -r a4deddfd0a6c -r 1a1e609806d6 sys/uvm/uvm_meter.c
--- a/sys/uvm/uvm_meter.c Sun Jul 02 16:19:46 2017 +0000
+++ b/sys/uvm/uvm_meter.c Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_meter.c,v 1.65 2014/12/01 04:11:14 msaitoh Exp $ */
+/* $NetBSD: uvm_meter.c,v 1.66 2017/07/02 16:41:33 joerg Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@@ -36,7 +36,7 @@
*/
#include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: uvm_meter.c,v 1.65 2014/12/01 04:11:14 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: uvm_meter.c,v 1.66 2017/07/02 16:41:33 joerg Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@@ -281,6 +281,18 @@
SYSCTL_DESCR("Maximum user address"),
NULL, VM_MAX_ADDRESS, NULL, 0,
CTL_VM, VM_MAXADDRESS, CTL_EOL);
+ sysctl_createv(clog, 0, NULL, NULL,
+ CTLFLAG_PERMANENT|CTLFLAG_UNSIGNED,
+ CTLTYPE_INT, "guard_size",
+ SYSCTL_DESCR("Guard size of main thread"),
+ NULL, 0, &user_stack_guard_size, 0,
+ CTL_VM, VM_GUARD_SIZE, CTL_EOL);
+ sysctl_createv(clog, 0, NULL, NULL,
+ CTLFLAG_PERMANENT|CTLFLAG_UNSIGNED|CTLFLAG_READWRITE,
+ CTLTYPE_INT, "thread_guard_size",
+ SYSCTL_DESCR("Guard size of other threads"),
+ NULL, 0, &user_thread_stack_guard_size, 0,
+ CTL_VM, VM_THREAD_GUARD_SIZE, CTL_EOL);
uvmpdpol_sysctlsetup();
}
diff -r a4deddfd0a6c -r 1a1e609806d6 sys/uvm/uvm_param.h
--- a/sys/uvm/uvm_param.h Sun Jul 02 16:19:46 2017 +0000
+++ b/sys/uvm/uvm_param.h Sun Jul 02 16:41:32 2017 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: uvm_param.h,v 1.36 2017/06/23 21:28:39 joerg Exp $ */
+/* $NetBSD: uvm_param.h,v 1.37 2017/07/02 16:41:33 joerg Exp $ */
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