netdev - Re: mlx5 XDP redirect leaking memory on kernel 6.3

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Message-ID: <da846559-4093-e8cf-9a99-218953f50b3c@huawei.com>
Date: Wed, 24 May 2023 19:29:35 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: Dragos Tatulea <dtatulea@...dia.com>, Tariq Toukan <tariqt@...dia.com>,
	"ttoukan.linux@...il.com" <ttoukan.linux@...il.com>, "jbrouer@...hat.com"
	<jbrouer@...hat.com>, Saeed Mahameed <saeedm@...dia.com>, "saeed@...nel.org"
	<saeed@...nel.org>, "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC: "maxtram95@...il.com" <maxtram95@...il.com>, "lorenzo@...nel.org"
	<lorenzo@...nel.org>, "alexander.duyck@...il.com"
	<alexander.duyck@...il.com>, "kheib@...hat.com" <kheib@...hat.com>,
	"ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
	"mkabat@...hat.com" <mkabat@...hat.com>, "brouer@...hat.com"
	<brouer@...hat.com>, "atzin@...hat.com" <atzin@...hat.com>,
	"fmaurer@...hat.com" <fmaurer@...hat.com>, "bpf@...r.kernel.org"
	<bpf@...r.kernel.org>, "jbenc@...hat.com" <jbenc@...hat.com>
Subject: Re: mlx5 XDP redirect leaking memory on kernel 6.3

On 2023/5/24 19:26, Yunsheng Lin wrote:
>> On XDP redirect and tx, the page is set to skip the bias counter release with
>> the expectation that page_pool_put_defragged_page will be called from [1]. But,
> 
> page_pool_put_defragged_page() can only be called when there is only user using

only *one* user

> the page, I am not sure how it can ensure that yet.
>