Re: [-mm PATCH 4/8] Memory controller memory accounting (v2)

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On 7/10/07, YAMAMOTO Takashi <[email protected]> wrote:
hi,

> diff -puN mm/memory.c~mem-control-accounting mm/memory.c
> --- linux-2.6.22-rc6/mm/memory.c~mem-control-accounting       2007-07-05 13:45:18.000000000 -0700
> +++ linux-2.6.22-rc6-balbir/mm/memory.c       2007-07-05 13:45:18.000000000 -0700

> @@ -1731,6 +1736,9 @@ gotten:
>               cow_user_page(new_page, old_page, address, vma);
>       }
>
> +     if (mem_container_charge(new_page, mm))
> +             goto oom;
> +
>       /*
>        * Re-check the pte - we dropped the lock
>        */

it seems that the page will be leaked on error.

You mean meta_page right?


> @@ -2188,6 +2196,11 @@ static int do_swap_page(struct mm_struct
>       }
>
>       delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
> +     if (mem_container_charge(page, mm)) {
> +             ret = VM_FAULT_OOM;
> +             goto out;
> +     }
> +
>       mark_page_accessed(page);
>       lock_page(page);
>

ditto.

> @@ -2264,6 +2278,9 @@ static int do_anonymous_page(struct mm_s
>               if (!page)
>                       goto oom;
>
> +             if (mem_container_charge(page, mm))
> +                     goto oom;
> +
>               entry = mk_pte(page, vma->vm_page_prot);
>               entry = maybe_mkwrite(pte_mkdirty(entry), vma);
>

ditto.

can you check the rest of the patch by yourself?  thanks.


Excellent catch! I'll review the accounting framework and post the
updated version soon

Balbir
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