Hello Dhaval,
On Mon, Jun 17, 2013 at 12:24:07PM -0400, Dhaval Giani wrote:
> Hi John,
>
> I have been giving your git tree a whirl, and in order to simulate a
> limited memory environment, I was using memory cgroups.
>
> The program I was using to test is attached here. It is your test
> code, with some changes (changing the syscall interface, reducing
> the memory pressure to be generated).
>
> I trapped it in a memory cgroup with 1MB memory.limit_in_bytes and hit this,
>
> [ 406.207612] ------------[ cut here ]------------
> [ 406.207621] kernel BUG at mm/vrange.c:523!
> [ 406.207626] invalid opcode: 0000 [#1] SMP
> [ 406.207631] Modules linked in:
> [ 406.207637] CPU: 0 PID: 1579 Comm: volatile-test Not tainted
Thanks for the testing!
Does below patch fix your problem?
diff --git a/mm/swapfile.c b/mm/swapfile.c
index d41c63f..1f6c80e 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -751,7 +751,7 @@ int __free_swap_and_cache(swp_entry_t entry)
page = find_get_page(swap_address_space(entry),
entry.val);
}
- spin_unlock(&swap_lock);
+ spin_unlock(&p->lock);
}
if (page) {
diff --git a/mm/vrange.c b/mm/vrange.c
index fa965fb..dc32cfa 100644
--- a/mm/vrange.c
+++ b/mm/vrange.c
@@ -485,7 +485,7 @@ int try_to_discard_one(struct vrange_root *vroot, struct
page *page,
{
struct mm_struct *mm = vma->vm_mm;
pte_t *pte;
- pte_t pteval;
+ pte_t pteval, pteswap;
spinlock_t *ptl;
int ret = 0;
bool present;
@@ -505,7 +505,7 @@ int try_to_discard_one(struct vrange_root *vroot, struct
page *page,
present = pte_present(*pte);
flush_cache_page(vma, address, page_to_pfn(page));
- ptep_clear_flush(vma, address, pte);
+ pteswap = ptep_clear_flush(vma, address, pte);
pteval = pte_mkvrange(*pte);
update_hiwater_rss(mm);
@@ -517,10 +517,11 @@ int try_to_discard_one(struct vrange_root *vroot, struct
page *page,
page_remove_rmap(page);
page_cache_release(page);
if (!present) {
- swp_entry_t entry = pte_to_swp_entry(*pte);
+ swp_entry_t entry = pte_to_swp_entry(pteswap);
dec_mm_counter(mm, MM_SWAPENTS);
- if (unlikely(!__free_swap_and_cache(entry)))
+ if (unlikely(!__free_swap_and_cache(entry))) {
BUG_ON(1);
+ }
}
set_pte_at(mm, address, pte, pteval);
--
1.7.9.5
--
Kind regards,
Minchan Kim
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