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Thanks, I managed to come up with a patch of my own.
The patch looks good, some comments
1. We do not really have to change the size of INIT_TASK
since that is architecture independent code in sched.h
PARISC is managing with init_task stack of 8K and
other stacks of 16K.
2. I think you missed getuser.S in arch/i386/kernel/lib.
All the __get_user_x should change to
3. I verified that the instance of GET_CURRENT in hw-irq.h
is not being used by anybody and can safely be removed.
__get_user_1:
movl %esp,%edx
andl $~(THREAD_SIZE - 1),%edx
cmpl addr_limit(%edx),%eax
I have a patch that lets the user select any stack size
from 8K to 64K, it can be configured. And yes, it works
on my system.
I do not have the /proc entry that u have though in
my patch.
Would you like to merge both the patches or would you
like me to do it and send out a new version.
The patch is attached along with this email. It
is againt 2.4.17
I believe that using 8K as stack size is correct.
My patch is to help people debug stack overflows
and if they wanted to experiment or port code from
other OS'es (where the code uses a stack > 8K - sizeof
(struct task_struct)) then they can use this patch.
Comments,
Balbir
>Hi Balbir,
>
>Here is my patch that does what you want but only on i386 architecture. I
>am forwarding it to you in case you are not subscribed to linux-kernel
>list.
>
>Regards
>Tigran
>
>---------- Forwarded message ----------
>Date: Fri, 8 Feb 2002 15:20:19 +0000 (GMT)
>From: Tigran Aivazian <tigran@veritas.com>
>To: linux-kernel@vger.kernel.org
>Cc: Hugh Dickins <hugh@veritas.com>
>Subject: [patch] larger kernel stack (8k->16k) per task
>
>Hi,
>
>In the light of some talks here about increasing kernel stack, here is my
>patch for i386 architecture that some may find useful. It also has a nice
>extra (/proc/stack) implemented by Hugh Dickins which helps to find major
>offenders.
>
>It is against 2.4.9 but should be easy to port in any direction. (One way
>the patch could be improved is by making the size CONFIG_ option instead
>of hardcoding). Oh btw, please don't tell me "but now you'd need _four_
>physically-contiguous pages to create a task instead of two!" because I
>know it (and think it's not too bad).
>
>Regards,
>Tigran
>
>diff -urN 249-vx/arch/i386/kernel/entry.S
>249-vx-bigstack/arch/i386/kernel/entry.S
>--- 249-vx/arch/i386/kernel/entry.S Tue Jun 12 19:47:28 2001
>+++ 249-vx-bigstack/arch/i386/kernel/entry.S Sun Jan 13 00:14:30 2002
>@@ -130,7 +130,7 @@
> .previous
>
> #define GET_CURRENT(reg) \
>- movl $-8192, reg; \
>+ movl $-16384, reg; \
> andl %esp, reg
>
> ENTRY(lcall7)
>@@ -145,7 +145,7 @@
> movl %ecx,CS(%esp) #
> movl %esp,%ebx
> pushl %ebx
>- andl $-8192,%ebx # GET_CURRENT
>+ andl $-16384,%ebx # GET_CURRENT
> movl exec_domain(%ebx),%edx # Get the execution domain
> movl 4(%edx),%edx # Get the lcall7 handler for the domain
> pushl $0x7
>@@ -166,7 +166,7 @@
> movl %ecx,CS(%esp) #
> movl %esp,%ebx
> pushl %ebx
>- andl $-8192,%ebx # GET_CURRENT
>+ andl $-16384,%ebx # GET_CURRENT
> movl exec_domain(%ebx),%edx # Get the execution domain
> movl 4(%edx),%edx # Get the lcall7 handler for the domain
> pushl $0x27
>diff -urN 249-vx/arch/i386/kernel/head.S
>249-vx-bigstack/arch/i386/kernel/head.S
>--- 249-vx/arch/i386/kernel/head.S Wed Jun 20 19:00:53 2001
>+++ 249-vx-bigstack/arch/i386/kernel/head.S Sun Jan 13 00:14:30 2002
>@@ -320,7 +320,7 @@
> ret
>
> ENTRY(stack_start)
>- .long SYMBOL_NAME(init_task_union)+8192
>+ .long SYMBOL_NAME(init_task_union)+16384
> .long __KERNEL_DS
>
> /* This is the default interrupt "handler" :-) */
>diff -urN 249-vx/arch/i386/kernel/process.c
>249-vx-bigstack/arch/i386/kernel/process.c
>--- 249-vx/arch/i386/kernel/process.c Thu Jul 26 02:19:11 2001
>+++ 249-vx-bigstack/arch/i386/kernel/process.c Sun Jan 13 00:14:30 2002
>@@ -757,12 +757,12 @@
> return 0;
> stack_page = (unsigned long)p;
> esp = p->thread.esp;
>- if (!stack_page || esp < stack_page || esp > 8188+stack_page)
>+ if (!stack_page || esp < stack_page || esp > 16380+stack_page)
> return 0;
> /* include/asm-i386/system.h:switch_to() pushes ebp last. */
> ebp = *(unsigned long *) esp;
> do {
>- if (ebp < stack_page || ebp > 8184+stack_page)
>+ if (ebp < stack_page || ebp > 16376+stack_page)
> return 0;
> eip = *(unsigned long *) (ebp+4);
> if (eip < first_sched || eip >= last_sched)
>diff -urN 249-vx/arch/i386/kernel/smpboot.c
>249-vx-bigstack/arch/i386/kernel/smpboot.c
>--- 249-vx/arch/i386/kernel/smpboot.c Tue Feb 13 22:13:43 2001
>+++ 249-vx-bigstack/arch/i386/kernel/smpboot.c Sun Jan 13 00:14:30 2002
>@@ -577,7 +577,7 @@
>
> /* So we see what's up */
> printk("Booting processor %d/%d eip %lx\n", cpu, apicid, start_eip);
>- stack_start.esp = (void *) (1024 + PAGE_SIZE + (char *)idle);
>+ stack_start.esp = (void *) idle->thread.esp;
>
> /*
> * This grunge runs the startup process for
>diff -urN 249-vx/arch/i386/kernel/traps.c
>249-vx-bigstack/arch/i386/kernel/traps.c
>--- 249-vx/arch/i386/kernel/traps.c Sun Aug 12 19:13:59 2001
>+++ 249-vx-bigstack/arch/i386/kernel/traps.c Sun Jan 13 00:14:30 2002
>@@ -160,7 +160,7 @@
> unsigned long esp = tsk->thread.esp;
>
> /* User space on another CPU? */
>- if ((esp ^ (unsigned long)tsk) & (PAGE_MASK<<1))
>+ if ((esp ^ (unsigned long)tsk) & ~(THREAD_SIZE-1))
> return;
> show_trace((unsigned long *)esp);
> }
>diff -urN 249-vx/arch/i386/lib/getuser.S
>249-vx-bigstack/arch/i386/lib/getuser.S
>--- 249-vx/arch/i386/lib/getuser.S Mon Jan 12 21:42:52 1998
>+++ 249-vx-bigstack/arch/i386/lib/getuser.S Sun Jan 13 00:14:30 2002
>@@ -28,7 +28,7 @@
> .globl __get_user_1
> __get_user_1:
> movl %esp,%edx
>- andl $0xffffe000,%edx
>+ andl $-16384,%edx
> cmpl addr_limit(%edx),%eax
> jae bad_get_user
> 1: movzbl (%eax),%edx
>@@ -41,7 +41,7 @@
> addl $1,%eax
> movl %esp,%edx
> jc bad_get_user
>- andl $0xffffe000,%edx
>+ andl $-16384,%edx
> cmpl addr_limit(%edx),%eax
> jae bad_get_user
> 2: movzwl -1(%eax),%edx
>@@ -54,7 +54,7 @@
> addl $3,%eax
> movl %esp,%edx
> jc bad_get_user
>- andl $0xffffe000,%edx
>+ andl $-16384,%edx
> cmpl addr_limit(%edx),%eax
> jae bad_get_user
> 3: movl -3(%eax),%edx
>diff -urN 249-vx/arch/i386/vmlinux.lds
>249-vx-bigstack/arch/i386/vmlinux.lds
>--- 249-vx/arch/i386/vmlinux.lds Sat Jan 12 21:31:54 2002
>+++ 249-vx-bigstack/arch/i386/vmlinux.lds Sun Jan 13 00:14:30 2002
>@@ -36,7 +36,7 @@
>
> _edata = .; /* End of data section */
>
>- . = ALIGN(8192); /* init_task */
>+ . = ALIGN(16384); /* init_task */
> .data.init_task : { *(.data.init_task) }
>
> . = ALIGN(4096); /* Init code and data */
>diff -urN 249-vx/include/asm-i386/current.h
>249-vx-bigstack/include/asm-i386/current.h
>--- 249-vx/include/asm-i386/current.h Sat Aug 15 00:35:22 1998
>+++ 249-vx-bigstack/include/asm-i386/current.h Sun Jan 13 00:14:30 2002
>@@ -6,7 +6,7 @@
> static inline struct task_struct * get_current(void)
> {
> struct task_struct *current;
>- __asm__("andl %%esp,%0; ":"=r" (current) : "0" (~8191UL));
>+ __asm__("andl %%esp,%0; ":"=r" (current) : "0" (~16383UL));
> return current;
> }
>
>diff -urN 249-vx/include/asm-i386/hw_irq.h
>249-vx-bigstack/include/asm-i386/hw_irq.h
>--- 249-vx/include/asm-i386/hw_irq.h Wed Aug 15 22:21:11 2001
>+++ 249-vx-bigstack/include/asm-i386/hw_irq.h Sun Jan 13 00:14:30 2002
>@@ -115,7 +115,7 @@
>
> #define GET_CURRENT \
> "movl %esp, %ebx\n\t" \
>- "andl $-8192, %ebx\n\t"
>+ "andl $-16384, %ebx\n\t"
>
> /*
> * SMP has a few special interrupts for IPI messages
>diff -urN 249-vx/include/asm-i386/processor.h
>249-vx-bigstack/include/asm-i386/processor.h
>--- 249-vx/include/asm-i386/processor.h Wed Aug 15 22:21:11 2001
>+++ 249-vx-bigstack/include/asm-i386/processor.h Sun Jan 13 00:14:30 2002
>@@ -445,13 +445,27 @@
> }
>
> unsigned long get_wchan(struct task_struct *p);
>-#define KSTK_EIP(tsk) (((unsigned long *)(4096+(unsigned
>long)(tsk)))[1019])
>-#define KSTK_ESP(tsk) (((unsigned long *)(4096+(unsigned
>long)(tsk)))[1022])
>
>-#define THREAD_SIZE (2*PAGE_SIZE)
>-#define alloc_task_struct() ((struct task_struct *)
>__get_free_pages(GFP_KERNEL,1))
>-#define free_task_struct(p) free_pages((unsigned long) (p), 1)
>-#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
>+#define THREAD_ORDER 2
>+#define THREAD_SIZE (PAGE_SIZE << THREAD_ORDER)
>+#define THREAD_LONGS (THREAD_SIZE / sizeof(unsigned long))
>+
>+#define KSTK_EIP(tsk) (((unsigned long *)(tsk))[THREAD_LONGS-5])
>+#define KSTK_ESP(tsk) (((unsigned long *)(tsk))[THREAD_LONGS-2])
>+
>+#define alloc_task_struct() \
>+ ({ \
>+ unsigned long tsk = __get_free_pages(GFP_KERNEL, THREAD_ORDER); \
>+ if (tsk != 0) { \
>+ /* Alt-SysRq-T show_task() show if stack went deep */ \
>+ memset((char*)tsk+sizeof(struct task_struct), 0, \
>+ THREAD_SIZE-sizeof(struct task_struct)); \
>+ } \
>+ (struct task_struct *) tsk; \
>+ })
>+
>+#define free_task_struct(tsk) free_pages((unsigned long) (tsk),
>THREAD_ORDER)
>+#define get_task_struct(tsk) atomic_inc(&virt_to_page(tsk)->count)
>
> #define init_task (init_task_union.task)
> #define init_stack (init_task_union.stack)
>diff -urN 249-vx/include/linux/sched.h
>249-vx-bigstack/include/linux/sched.h
>--- 249-vx/include/linux/sched.h Sat Jan 12 23:53:58 2002
>+++ 249-vx-bigstack/include/linux/sched.h Sun Jan 13 00:14:30 2002
>@@ -484,7 +484,7 @@
>
>
> #ifndef INIT_TASK_SIZE
>-# define INIT_TASK_SIZE 2048*sizeof(long)
>+# define INIT_TASK_SIZE 4096*sizeof(long)
> #endif
>
> union task_union {
>diff -urN 249-vx/kernel/exit.c 249-vx-bigstack/kernel/exit.c
>--- 249-vx/kernel/exit.c Sun Aug 12 18:52:29 2001
>+++ 249-vx-bigstack/kernel/exit.c Sun Jan 13 00:14:30 2002
>@@ -11,6 +11,7 @@
> #include <linux/module.h>
> #include <linux/completion.h>
> #include <linux/tty.h>
>+#include <linux/proc_fs.h>
> #ifdef CONFIG_BSD_PROCESS_ACCT
> #include <linux/acct.h>
> #endif
>@@ -24,6 +25,74 @@
>
> int getrusage(struct task_struct *, int, struct rusage *);
>
>+#ifdef CONFIG_PROC_FS
>+static int max_stack_depth;
>+static pid_t max_stack_pid;
>+static struct task_struct *max_stack_task; /* kept for kdb */
>+static spinlock_t max_stack_lock = SPIN_LOCK_UNLOCKED;
>+static void check_stack_depth(struct task_struct *);
>+
>+static int stack_read_proc(char *page, char **start, off_t off,
>+ int count, int *eof, void *data)
>+{
>+ struct task_struct *p;
>+ int len;
>+
>+ read_lock(&tasklist_lock);
>+ for_each_task(p)
>+ check_stack_depth(p);
>+ read_unlock(&tasklist_lock);
>+
>+ spin_lock(&max_stack_lock);
>+ len = sprintf(page,
>+ "Deepest stack is 0x%04x (+ task 0x%04x = 0x%04x) for pid %d %.16s\n",
>+ max_stack_depth, sizeof(*p), sizeof(*p) + max_stack_depth,
>+ max_stack_pid, max_stack_task->comm);
>+ spin_unlock(&max_stack_lock);
>+
>+ *eof = (len <= off + count);
>+ *start = page + off;
>+ len -= off;
>+ if (len > count)
>+ len = count;
>+ if (len < 0)
>+ len = 0;
>+ return len;
>+}
>+
>+static void check_stack_depth(struct task_struct *p)
>+{
>+ int depth;
>+ struct task_struct *old_stack_task;
>+ unsigned long *sp = (unsigned long *)(p + 1);
>+
>+ while (!*sp)
>+ sp++;
>+ depth = (int)p + THREAD_SIZE - (int)sp;
>+ if (depth <= max_stack_depth)
>+ return;
>+
>+ old_stack_task = NULL;
>+ spin_lock(&max_stack_lock);
>+ if (depth > max_stack_depth) {
>+ old_stack_task = max_stack_task;
>+ max_stack_depth = depth;
>+ max_stack_pid = p->pid;
>+ max_stack_task = p;
>+ get_task_struct(p);
>+ }
>+ spin_unlock(&max_stack_lock);
>+
>+ if (old_stack_task)
>+ free_task_struct(old_stack_task);
>+ else
>+ create_proc_read_entry("stack",
>+ 0444, NULL, stack_read_proc, NULL);
>+}
>+#else /* ndef CONFIG_PROC_FS */
>+#define check_stack_depth(p) do { } while (0)
>+#endif /* ndef CONFIG_PROC_FS */
>+
> static void release_task(struct task_struct * p)
> {
> if (p != current) {
>@@ -63,6 +132,7 @@
> current->counter += p->counter;
> if (current->counter >= MAX_COUNTER)
> current->counter = MAX_COUNTER;
>+ check_stack_depth(p);
> p->pid = 0;
> free_task_struct(p);
> } else {
>
>
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