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authorKaiGai Kohei <kaigai@ak.jp.nec.com>2006-06-25 05:49:24 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-25 10:01:25 -0700
commit0e4648141af02331f21aabcd34940c70f09a2d04 (patch)
tree3e4dea992a8e3f3194be04a0fd3e14c24a313ee7 /kernel
parent6bc392741d661eb84be503d1fdf14b6746615e4c (diff)
downloadop-kernel-dev-0e4648141af02331f21aabcd34940c70f09a2d04.zip
op-kernel-dev-0e4648141af02331f21aabcd34940c70f09a2d04.tar.gz
[PATCH] pacct: add pacct_struct to fix some pacct bugs.
The pacct facility need an i/o operation when an accounting record is generated. There is a possibility to wake OOM killer up. If OOM killer is activated, it kills some processes to make them release process memory regions. But acct_process() is called in the killed processes context before calling exit_mm(), so those processes cannot release own memory. In the results, any processes stop in this point and it finally cause a system stall.
Diffstat (limited to 'kernel')
-rw-r--r--kernel/acct.c51
-rw-r--r--kernel/exit.c4
-rw-r--r--kernel/fork.c1
3 files changed, 40 insertions, 16 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index 44dd6bd..b352631 100644
--- a/kernel/acct.c
+++ b/kernel/acct.c
@@ -421,9 +421,9 @@ static u32 encode_float(u64 value)
*/
static void do_acct_process(long exitcode, struct file *file)
{
+ struct pacct_struct *pacct = &current->signal->pacct;
acct_t ac;
mm_segment_t fs;
- unsigned long vsize;
unsigned long flim;
u64 elapsed;
u64 run_time;
@@ -505,20 +505,9 @@ static void do_acct_process(long exitcode, struct file *file)
ac.ac_flag |= ACORE;
if (current->flags & PF_SIGNALED)
ac.ac_flag |= AXSIG;
-
- vsize = 0;
- if (current->mm) {
- struct vm_area_struct *vma;
- down_read(&current->mm->mmap_sem);
- vma = current->mm->mmap;
- while (vma) {
- vsize += vma->vm_end - vma->vm_start;
- vma = vma->vm_next;
- }
- up_read(&current->mm->mmap_sem);
- }
- vsize = vsize / 1024;
- ac.ac_mem = encode_comp_t(vsize);
+ spin_lock(&current->sighand->siglock);
+ ac.ac_mem = encode_comp_t(pacct->ac_mem);
+ spin_unlock(&current->sighand->siglock);
ac.ac_io = encode_comp_t(0 /* current->io_usage */); /* %% */
ac.ac_rw = encode_comp_t(ac.ac_io / 1024);
ac.ac_minflt = encode_comp_t(current->signal->min_flt +
@@ -546,6 +535,38 @@ static void do_acct_process(long exitcode, struct file *file)
}
/**
+ * acct_init_pacct - initialize a new pacct_struct
+ */
+void acct_init_pacct(struct pacct_struct *pacct)
+{
+ memset(pacct, 0, sizeof(struct pacct_struct));
+}
+
+/**
+ * acct_collect - collect accounting information into pacct_struct
+ */
+void acct_collect(void)
+{
+ struct pacct_struct *pacct = &current->signal->pacct;
+ unsigned long vsize = 0;
+
+ if (current->mm) {
+ struct vm_area_struct *vma;
+ down_read(&current->mm->mmap_sem);
+ vma = current->mm->mmap;
+ while (vma) {
+ vsize += vma->vm_end - vma->vm_start;
+ vma = vma->vm_next;
+ }
+ up_read(&current->mm->mmap_sem);
+ }
+
+ spin_lock(&current->sighand->siglock);
+ pacct->ac_mem = vsize / 1024;
+ spin_unlock(&current->sighand->siglock);
+}
+
+/**
* acct_process - now just a wrapper around do_acct_process
* @exitcode: task exit code
*
diff --git a/kernel/exit.c b/kernel/exit.c
index 601263c..819d82c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -894,7 +894,7 @@ fastcall NORET_TYPE void do_exit(long code)
if (group_dead) {
hrtimer_cancel(&tsk->signal->real_timer);
exit_itimers(tsk->signal);
- acct_process(code);
+ acct_collect();
}
if (unlikely(tsk->robust_list))
exit_robust_list(tsk);
@@ -906,6 +906,8 @@ fastcall NORET_TYPE void do_exit(long code)
audit_free(tsk);
exit_mm(tsk);
+ if (group_dead)
+ acct_process(code);
exit_sem(tsk);
__exit_files(tsk);
__exit_fs(tsk);
diff --git a/kernel/fork.c b/kernel/fork.c
index 49adc0e..dfd10cb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -874,6 +874,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts
tsk->it_prof_expires =
secs_to_cputime(sig->rlim[RLIMIT_CPU].rlim_cur);
}
+ acct_init_pacct(&sig->pacct);
return 0;
}
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