On 12/22/05, Sanjay Kumar <coolsanjay@xxxxxxxxx> wrote:
Hi David,
Thanks a lot for the inputs.
Is there any way to ensure that page reference count get decremented
properly before you free pages.
I think kernel will not allow you to free page until is has maintained reference count to it.\
Currenly i allocate a data page and use sendpage to pass the data tonetwork layer and later on i free the page.
I think it will not free until data page is filled in packet and that packet is not transmitted to NIC card.
It seems to me that on returning from sendpage the page reference
count is not getting decremented.
So when i try to free the page the page does not get freed resulting
in a kind of memory leak.
Please let me know if my undrstanding is not correct.
kSanjay
Just before freeing the page wh
On 12/22/05, David S. Miller < davem@xxxxxxxxxxxxx> wrote:
> From: Sanjay Kumar <coolsanjay@xxxxxxxxx>
> Date: Thu, 22 Dec 2005 13:32:56 +0900
>
> > On looking at the linux source code for kernel 2.6.14 i found out that
> > in the following code a call is being made to "get_page" which
> > increments the page reference count, but there is no corresponding
> > "put_page" or other function which decrement the page count.
>
> It gets decremented when the SKB is freed via kfree_skb().
> See net/core/skbuff.c:skb_release_data(), invoked by kfree_skbmem(),
> invoked by __kfree_skb(), invoked by kfree_skb().
>
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