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Message-Id: <1232446600.784.16.camel@matrix>
Date: Tue, 20 Jan 2009 11:16:40 +0100
From: Stefani Seibold <stefani@...bold.net>
To: linux-kernel@...r.kernel.org
Subject: Detailed Stack Information Patch [1/3]
diff -u -N -r linux-2.6.28.1.orig/fs/exec.c linux-2.6.28.1/fs/exec.c
--- linux-2.6.28.1.orig/fs/exec.c 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/fs/exec.c 2009-01-20 09:10:35.000000000 +0100
@@ -1342,6 +1342,9 @@
current->flags &= ~PF_KTHREAD;
retval = search_binary_handler(bprm,regs);
if (retval >= 0) {
+#ifdef CONFIG_PROC_STACK
+ current->stack_start = current->mm->start_stack;
+#endif
/* execve success */
security_bprm_free(bprm);
acct_update_integrals(current);
diff -u -N -r linux-2.6.28.1.orig/fs/proc/array.c linux-2.6.28.1/fs/proc/array.c
--- linux-2.6.28.1.orig/fs/proc/array.c 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/fs/proc/array.c 2009-01-20 09:10:35.000000000 +0100
@@ -308,6 +308,25 @@
p->nivcsw);
}
+#ifdef CONFIG_PROC_STACK
+static inline void task_show_stack_usage(struct seq_file *m,
+ struct task_struct *p)
+{
+ unsigned long cur_stack;
+ unsigned long base_page;
+
+ base_page = KSTK_ESP(p) >> PAGE_SHIFT;
+
+#ifdef CONFIG_STACK_GROWSUP
+ cur_stack = base_page-(p->stack_start >> PAGE_SHIFT);
+#else
+ cur_stack = (p->stack_start >> PAGE_SHIFT)-base_page;
+#endif
+ seq_printf(m, "stack usage:\t%lu kB\n",
+ (cur_stack + 1) << (PAGE_SHIFT-10));
+}
+#endif
+
int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
struct pid *pid, struct task_struct *task)
{
@@ -327,6 +346,9 @@
task_show_regs(m, task);
#endif
task_context_switch_counts(m, task);
+#ifdef CONFIG_PROC_STACK
+ task_show_stack_usage(m, task);
+#endif
return 0;
}
diff -u -N -r linux-2.6.28.1.orig/fs/proc/task_mmu.c linux-2.6.28.1/fs/proc/task_mmu.c
--- linux-2.6.28.1.orig/fs/proc/task_mmu.c 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/fs/proc/task_mmu.c 2009-01-20 09:10:35.000000000 +0100
@@ -240,6 +240,11 @@
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
name = "[stack]";
+#ifdef CONFIG_PROC_STACK
+ } else if (vma->vm_start <= mm->start_stack &&
+ vma->vm_end >= mm->start_stack) {
+ name = "[thread stack]";
+#endif
}
} else {
name = "[vdso]";
diff -u -N -r linux-2.6.28.1.orig/include/linux/sched.h linux-2.6.28.1/include/linux/sched.h
--- linux-2.6.28.1.orig/include/linux/sched.h 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/include/linux/sched.h 2009-01-20 09:10:35.000000000 +0100
@@ -1356,6 +1356,9 @@
unsigned long default_timer_slack_ns;
struct list_head *scm_work_list;
+#ifdef CONFIG_PROC_STACK
+ unsigned long stack_start;
+#endif
};
/*
diff -u -N -r linux-2.6.28.1.orig/init/Kconfig linux-2.6.28.1/init/Kconfig
--- linux-2.6.28.1.orig/init/Kconfig 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/init/Kconfig 2009-01-20 09:10:36.000000000 +0100
@@ -814,6 +814,18 @@
source "arch/Kconfig"
+config PROC_STACK
+ default y
+ depends on PROC_FS && MMU
+ bool "Enable /proc/<pid> stack monitoring" if EMBEDDED
+ help
+ This enables monitoring of process and thread stack utilization.
+
+ The /proc/pid/maps, /proc/pid/smaps, /proc/pid/status and the
+ /proc/pid/task/pid pedants will be extended by the stack information.
+ Disabling these interfaces will reduce the size of the kernel by
+ approximately 1kb.
+
endmenu # General setup
config HAVE_GENERIC_DMA_COHERENT
diff -u -N -r linux-2.6.28.1.orig/kernel/fork.c linux-2.6.28.1/kernel/fork.c
--- linux-2.6.28.1.orig/kernel/fork.c 2009-01-18 19:45:37.000000000 +0100
+++ linux-2.6.28.1/kernel/fork.c 2009-01-20 09:10:36.000000000 +0100
@@ -1093,6 +1093,11 @@
p->blocked_on = NULL; /* not blocked yet */
#endif
+#ifdef CONFIG_PROC_STACK
+ p->stack_start = (stack_start == KSTK_ESP(current)) ?
+ current->stack_start : stack_start;
+#endif
+
/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);
--
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