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perf_counter: fix the mlock accounting 

Reading through the code I saw I forgot the finish the mlock accounting.
Do so now.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
LKML-Reference: <20090406094517.899767331@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-04-06 11:45:05 +02:00 committed by Ingo Molnar
parent f6c7d5fe58
commit ebb3c4c4cb
1 changed files with 21 additions and 12 deletions
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33
kernel/perf_counter.c
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@ -1461,13 +1461,14 @@ static void perf_mmap_close(struct vm_area_struct *vma)
if (atomic_dec_and_mutex_lock(&counter->mmap_count,
&counter->mmap_mutex)) {
vma->vm_mm->locked_vm -= counter->data->nr_pages + 1;
perf_mmap_data_free(counter);
mutex_unlock(&counter->mmap_mutex);
}
}
static struct vm_operations_struct perf_mmap_vmops = {
.open = perf_mmap_open,
.open = perf_mmap_open,
.close = perf_mmap_close,
.fault = perf_mmap_fault,
};
@ -1499,24 +1500,32 @@ static int perf_mmap(struct file *file, struct vm_area_struct *vma)
if (vma->vm_pgoff != 0)
return -EINVAL;
locked = vma_size >> PAGE_SHIFT;
locked += vma->vm_mm->locked_vm;
mutex_lock(&counter->mmap_mutex);
if (atomic_inc_not_zero(&counter->mmap_count)) {
if (nr_pages != counter->data->nr_pages)
ret = -EINVAL;
goto unlock;
}
locked = vma->vm_mm->locked_vm;
locked += nr_pages + 1;
lock_limit = current->signal->rlim[RLIMIT_MEMLOCK].rlim_cur;
lock_limit >>= PAGE_SHIFT;
if ((locked > lock_limit) && !capable(CAP_IPC_LOCK))
return -EPERM;
mutex_lock(&counter->mmap_mutex);
if (atomic_inc_not_zero(&counter->mmap_count))
goto out;
if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
ret = -EPERM;
goto unlock;
}
WARN_ON(counter->data);
ret = perf_mmap_data_alloc(counter, nr_pages);
if (!ret)
atomic_set(&counter->mmap_count, 1);
out:
if (ret)
goto unlock;
atomic_set(&counter->mmap_count, 1);
vma->vm_mm->locked_vm += nr_pages + 1;
unlock:
mutex_unlock(&counter->mmap_mutex);
vma->vm_flags &= ~VM_MAYWRITE;