From: Johannes Weiner <jweiner@redhat.com>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>
Subject: Re: [PATCH] fix rmap walk during fork
Date: Wed, 15 Sep 2010 22:10:02 +0200 [thread overview]
Message-ID: <20100915201002.GD15987@redhat.com> (raw)
In-Reply-To: <20100915171657.GP5981@random.random>
On Wed, Sep 15, 2010 at 07:16:57PM +0200, Andrea Arcangeli wrote:
> From: Andrea Arcangeli <aarcange@redhat.com>
>
> The below bug in fork lead to the rmap walk finding the parent huge-pmd twice
> instead of just one, because the anon_vma_chain objects of the child vma still
> point to the vma->vm_mm of the parent. The below patch fixes it by making the
> rmap walk accurate during fork. It's not a big deal normally but it
> worth being accurate considering the cost is the same.
>
> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com>
Acked-by: Johannes Weiner <jweiner@redhat.com>
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next prev parent reply other threads:[~2010-09-15 20:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-15 17:16 [PATCH] fix rmap walk during fork Andrea Arcangeli
2010-09-15 19:49 ` Hugh Dickins
2010-09-15 20:10 ` Johannes Weiner [this message]
2010-09-15 20:38 ` Rik van Riel
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