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reduce the size of user coredump files by not dumping regions of

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the address space that have never been touched (such as much of the
virtual space allocated for pthread stacks).
This commit is contained in:
chs 2005-01-21 03:24:40 +00:00
parent 1a5a156a7e
commit 7c203c91d4
1 changed files with 28 additions and 26 deletions
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54
sys/uvm/uvm_glue.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_glue.c,v 1.81 2004/05/12 20:09:51 yamt Exp $ */
/* $NetBSD: uvm_glue.c,v 1.82 2005/01/21 03:24:40 chs Exp $ */
/*
* Copyright (c) 1997 Charles D. Cranor and Washington University.
@ -67,7 +67,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.81 2004/05/12 20:09:51 yamt Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_glue.c,v 1.82 2005/01/21 03:24:40 chs Exp $");
#include "opt_kgdb.h"
#include "opt_kstack.h"
@ -717,11 +717,8 @@ uvm_coredump_walkmap(p, vp, cred, func, cookie)
struct vmspace *vm = p->p_vmspace;
struct vm_map *map = &vm->vm_map;
struct vm_map_entry *entry;
vaddr_t maxstack;
int error;
maxstack = trunc_page(USRSTACK - ctob(vm->vm_ssize));
entry = NULL;
vm_map_lock_read(map);
for (;;) {
@ -732,38 +729,43 @@ uvm_coredump_walkmap(p, vp, cred, func, cookie)
if (entry == &map->header)
break;
/* Should never happen for a user process. */
if (UVM_ET_ISSUBMAP(entry))
panic("uvm_coredump_walkmap: user process with "
"submap?");
state.cookie = cookie;
state.start = entry->start;
state.end = entry->end;
state.prot = entry->protection;
state.flags = 0;
if (state.start >= VM_MAXUSER_ADDRESS)
continue;
if (state.end > VM_MAXUSER_ADDRESS)
state.end = VM_MAXUSER_ADDRESS;
/*
* Dump the region unless one of the following is true:
*
* (1) the region has neither object nor amap behind it
* (ie. it has never been accessed).
*
* (2) the region has no amap and is read-only
* (eg. an executable text section).
*
* (3) the region's object is a device.
*/
KASSERT(!UVM_ET_ISSUBMAP(entry));
KASSERT(state.start < VM_MAXUSER_ADDRESS);
KASSERT(state.end <= VM_MAXUSER_ADDRESS);
if (entry->object.uvm_obj == NULL &&
entry->aref.ar_amap == NULL) {
state.flags |= UVM_COREDUMP_NODUMP;
}
if ((entry->protection & VM_PROT_WRITE) == 0 &&
entry->aref.ar_amap == NULL) {
state.flags |= UVM_COREDUMP_NODUMP;
}
if (entry->object.uvm_obj != NULL &&
UVM_OBJ_IS_DEVICE(entry->object.uvm_obj)) {
state.flags |= UVM_COREDUMP_NODUMP;
}
if (state.start >= (vaddr_t)vm->vm_maxsaddr) {
if (state.end <= maxstack)
continue;
if (state.start < maxstack)
state.start = maxstack;
state.flags |= UVM_COREDUMP_STACK;
}
if ((entry->protection & VM_PROT_WRITE) == 0)
state.flags |= UVM_COREDUMP_NODUMP;
if (entry->object.uvm_obj != NULL &&
UVM_OBJ_IS_DEVICE(entry->object.uvm_obj))
state.flags |= UVM_COREDUMP_NODUMP;
vm_map_unlock_read(map);
error = (*func)(p, vp, cred, &state);
if (error)