For us people still running m68knommu:
I implemented this in arch/m68k*. I patched fs/proc/base.c, and I'm not sure
entirely sure if it's the proper place.
I believe a stack checker for threads would need to be implemented inside of
libpthreads.
----
Simple stack checker for the m68knommu architecture. It implements a per-PID
proc file system entry.
The kernel already memsets the bss, brk, and stack regions to zero. The checker
calculates the used stack space by searching for the first non-zero value. The
values returned are the total stack size and used size.
/root # cat /proc/144/stackuse
4082 2089
Signed-off-by <Jate Sujjavanich jsujjavan...@syntech-fuelmaster.com>
----
diff --git a/arch/m68k/include/asm/mmu.h b/arch/m68k/include/asm/mmu.h
index 8a11a63..cbb0db7 100644
--- a/arch/m68k/include/asm/mmu.h
+++ b/arch/m68k/include/asm/mmu.h
@@ -7,6 +7,7 @@ typedef unsigned long mm_context_t;
#else
typedef struct {
unsigned long end_brk;
+ unsigned long end_stack;
} mm_context_t;
#endif
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8418fcc..f33557a 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -360,6 +360,30 @@ static int proc_pid_stack(struct seq_file *m, struct
pid_namespace *ns,
}
#endif
+#if !defined(CONFIG_MMU) && defined(CONFIG_M68K)
+static int proc_pid_stack_usage(struct seq_file *m, struct pid_namespace *ns,
+ struct pid *pid, struct task_struct *task)
+{
+ struct mm_struct *mm = get_task_mm(task);
+
+ unsigned long stack_length = mm->start_stack - mm->context.end_stack;
+ unsigned char *stack_first_data =
+ (unsigned char *)mm->context.end_stack;
+ unsigned long stack_used;
+
+ while ((stack_first_data < (unsigned char *)mm->start_stack)
+ && (*stack_first_data == 0))
+ stack_first_data++;
+
+ stack_used = mm->start_stack - (unsigned long)stack_first_data;
+
+ /* est stack size, zero zone */
+ seq_printf(m, "%lu %lu\n", stack_length, (unsigned long)stack_used);
+
+ return 0;
+}
+#endif
+
#ifdef CONFIG_SCHEDSTATS
/*
* Provides /proc/PID/schedstat
@@ -2615,6 +2639,9 @@ static const struct pid_entry tgid_base_stuff[] = {
#ifdef CONFIG_STACKTRACE
ONE("stack", S_IRUSR, proc_pid_stack),
#endif
+#if !defined(CONFIG_MMU) && defined(CONFIG_M68K)
+ ONE("stackuse", S_IRUGO, proc_pid_stack_usage),
+#endif
#ifdef CONFIG_SCHEDSTATS
INF("schedstat", S_IRUGO, proc_pid_schedstat),
#endif
@@ -2949,6 +2976,9 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_STACKTRACE
ONE("stack", S_IRUSR, proc_pid_stack),
#endif
+#if !defined(CONFIG_MMU) && defined(CONFIG_M68K)
+ ONE("stackuse", S_IRUGO, proc_pid_stack_usage),
+#endif
#ifdef CONFIG_SCHEDSTATS
INF("schedstat", S_IRUGO, proc_pid_schedstat),
#endif
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