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

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Date:	Tue, 10 Jul 2007 14:11:18 +0530
From:	"Balbir Singh" <balbir@...ux.vnet.ibm.com>
To:	"YAMAMOTO Takashi" <yamamoto@...inux.co.jp>
Cc:	svaidy@...ux.vnet.ibm.com, akpm@...ux-foundation.org,
	xemul@...nvz.org, a.p.zijlstra@...llo.nl,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	ebiederm@...ssion.com, containers@...ts.osdl.org, menage@...gle.com
Subject: Re: [-mm PATCH 4/8] Memory controller memory accounting (v2)

On 7/10/07, YAMAMOTO Takashi <yamamoto@...inux.co.jp> 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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