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authorRobin Holt <holt@sgi.com>2010-05-11 14:06:46 -0700
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-26 14:32:04 -0700
commitb759d0992e1fdcf2a76ebef37289e787b375fa28 (patch)
treebcd613d0a5dee3ccbe9e83c27e3efdff7d9cb8b9
parent23e7ebc2b334b2a200983e8e48289634f0b0bf5f (diff)
revert "procfs: provide stack information for threads" and its fixup commits
commit 34441427aab4bdb3069a4ffcda69a99357abcb2e upstream. Originally, commit d899bf7b ("procfs: provide stack information for threads") attempted to introduce a new feature for showing where the threadstack was located and how many pages are being utilized by the stack. Commit c44972f1 ("procfs: disable per-task stack usage on NOMMU") was applied to fix the NO_MMU case. Commit 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") was applied to fix a bug in ia32 executables being loaded. Commit 9ebd4eba7 ("procfs: fix /proc/<pid>/stat stack pointer for kernel threads") was applied to fix a bug which had kernel threads printing a userland stack address. Commit 1306d603f ('proc: partially revert "procfs: provide stack information for threads"') was then applied to revert the stack pages being used to solve a significant performance regression. This patch nearly undoes the effect of all these patches. The reason for reverting these is it provides an unusable value in field 28. For x86_64, a fork will result in the task->stack_start value being updated to the current user top of stack and not the stack start address. This unpredictability of the stack_start value makes it worthless. That includes the intended use of showing how much stack space a thread has. Other architectures will get different values. As an example, ia64 gets 0. The do_fork() and copy_process() functions appear to treat the stack_start and stack_size parameters as architecture specific. I only partially reverted c44972f1 ("procfs: disable per-task stack usage on NOMMU") . If I had completely reverted it, I would have had to change mm/Makefile only build pagewalk.o when CONFIG_PROC_PAGE_MONITOR is configured. Since I could not test the builds without significant effort, I decided to not change mm/Makefile. I only partially reverted 89240ba0 ("x86, fs: Fix x86 procfs stack information for threads on 64-bit") . I left the KSTK_ESP() change in place as that seemed worthwhile. Signed-off-by: Robin Holt <holt@sgi.com> Cc: Stefani Seibold <stefani@seibold.net> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Michal Simek <monstr@monstr.eu> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--Documentation/filesystems/proc.txt3
-rw-r--r--fs/compat.c2
-rw-r--r--fs/exec.c2
-rw-r--r--fs/proc/array.c3
-rw-r--r--fs/proc/task_mmu.c19
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/fork.c2
7 files changed, 2 insertions, 30 deletions
diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
index 0d07513a67a6..bf241be2cfd2 100644
--- a/Documentation/filesystems/proc.txt
+++ b/Documentation/filesystems/proc.txt
@@ -308,7 +308,7 @@ address perms offset dev inode pathname
08049000-0804a000 rw-p 00001000 03:00 8312 /opt/test
0804a000-0806b000 rw-p 00000000 00:00 0 [heap]
a7cb1000-a7cb2000 ---p 00000000 00:00 0
-a7cb2000-a7eb2000 rw-p 00000000 00:00 0 [threadstack:001ff4b4]
+a7cb2000-a7eb2000 rw-p 00000000 00:00 0
a7eb2000-a7eb3000 ---p 00000000 00:00 0
a7eb3000-a7ed5000 rw-p 00000000 00:00 0
a7ed5000-a8008000 r-xp 00000000 03:00 4222 /lib/libc.so.6
@@ -344,7 +344,6 @@ is not associated with a file:
[stack] = the stack of the main process
[vdso] = the "virtual dynamic shared object",
the kernel system call handler
- [threadstack:xxxxxxxx] = the stack of the thread, xxxxxxxx is the stack size
or if empty, the mapping is anonymous.
diff --git a/fs/compat.c b/fs/compat.c
index 00d90c2e66f0..514b6236ac74 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1530,8 +1530,6 @@ int compat_do_execve(char * filename,
if (retval < 0)
goto out;
- current->stack_start = current->mm->start_stack;
-
/* execve succeeded */
current->fs->in_exec = 0;
current->in_execve = 0;
diff --git a/fs/exec.c b/fs/exec.c
index 9071360e637f..332f781330f8 100644
--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1386,8 +1386,6 @@ int do_execve(char * filename,
if (retval < 0)
goto out;
- current->stack_start = current->mm->start_stack;
-
/* execve succeeded */
current->fs->in_exec = 0;
current->in_execve = 0;
diff --git a/fs/proc/array.c b/fs/proc/array.c
index 13b5d0708175..69eb4c43669b 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -82,7 +82,6 @@
#include <linux/pid_namespace.h>
#include <linux/ptrace.h>
#include <linux/tracehook.h>
-#include <linux/swapops.h>
#include <asm/pgtable.h>
#include <asm/processor.h>
@@ -494,7 +493,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
rsslim,
mm ? mm->start_code : 0,
mm ? mm->end_code : 0,
- (permitted && mm) ? task->stack_start : 0,
+ (permitted && mm) ? mm->start_stack : 0,
esp,
eip,
/* The signal information here is obsolete.
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index f277c4a111cb..9df34a506c2b 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -243,25 +243,6 @@ static void show_map_vma(struct seq_file *m, struct vm_area_struct *vma)
} else if (vma->vm_start <= mm->start_stack &&
vma->vm_end >= mm->start_stack) {
name = "[stack]";
- } else {
- unsigned long stack_start;
- struct proc_maps_private *pmp;
-
- pmp = m->private;
- stack_start = pmp->task->stack_start;
-
- if (vma->vm_start <= stack_start &&
- vma->vm_end >= stack_start) {
- pad_len_spaces(m, len);
- seq_printf(m,
- "[threadstack:%08lx]",
-#ifdef CONFIG_STACK_GROWSUP
- vma->vm_end - stack_start
-#else
- stack_start - vma->vm_start
-#endif
- );
- }
}
} else {
name = "[vdso]";
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1f5fa53b46b1..db821a408828 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1560,7 +1560,6 @@ struct task_struct {
/* bitmask of trace recursion */
unsigned long trace_recursion;
#endif /* CONFIG_TRACING */
- unsigned long stack_start;
#ifdef CONFIG_CGROUP_MEM_RES_CTLR /* memcg uses this to do batch job */
struct memcg_batch_info {
int do_batch; /* incremented when batch uncharge started */
diff --git a/kernel/fork.c b/kernel/fork.c
index f88bd984df35..0ea67a3df3a6 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -1134,8 +1134,6 @@ static struct task_struct *copy_process(unsigned long clone_flags,
p->bts = NULL;
- p->stack_start = stack_start;
-
/* Perform scheduler related setup. Assign this task to a CPU. */
sched_fork(p, clone_flags);