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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/acct.c
parent6bc392741d661eb84be503d1fdf14b6746615e4c (diff)
downloadlinux-0e4648141af02331f21aabcd34940c70f09a2d04.tar.bz2
[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/acct.c')
-rw-r--r--kernel/acct.c51
1 files changed, 36 insertions, 15 deletions
diff --git a/kernel/acct.c b/kernel/acct.c
index 44dd6bd63517..b35263137824 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
*