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SubjectRe: [PATCH] __free_pages_ok oops
"David S. Miller" wrote:
>
> From: Andrew Morton <akpm@zip.com.au>
> Date: Wed, 06 Feb 2002 22:19:32 -0800
>
> It's only a problem if this is the final put_page(). In the
> case of sendfile(), process-context code can be taught to take
> a temporary reference on the page, and only release it after the network
> stack is known to have finished with the page. sendfile is synchronous, yes?
>
> Userspace can return long before the SKBs are free'd up. That SKB
> free doesn't happen until the ACKs come back from the receiver.

I feel that presence on the lru list should contribute to
page->count. It seems a bit weird and kludgy that this
is not so.

If we were to do this then would this not fix networking's
problem? The skb free wouldn't release the page - it would
be left on the LRU with ->count == 1 and kswapd would reap it.

(Says me, hoping that Hugh will code it :))

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