linux-kernel - Re: [PATCH net v2 0/2] fix two bugs related to page

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Message-ID: <b1fd5ece-b967-4e56-ad4f-64ec437e2634@huawei.com>
Date: Sat, 12 Oct 2024 20:05:31 +0800
From: Yunsheng Lin <linyunsheng@...wei.com>
To: <davem@...emloft.net>, <kuba@...nel.org>, <pabeni@...hat.com>
CC: <liuyonglong@...wei.com>, <fanghaiqing@...wei.com>,
	<zhangkun09@...wei.com>, Alexander Lobakin <aleksander.lobakin@...el.com>,
	Robin Murphy <robin.murphy@....com>, Alexander Duyck
	<alexander.duyck@...il.com>, IOMMU <iommu@...ts.linux.dev>, Alexei
 Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Jesper
 Dangaard Brouer <hawk@...nel.org>, John Fastabend <john.fastabend@...il.com>,
	Matthias Brugger <matthias.bgg@...il.com>, AngeloGioacchino Del Regno
	<angelogioacchino.delregno@...labora.com>, <netdev@...r.kernel.org>,
	<intel-wired-lan@...ts.osuosl.org>, <bpf@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-mediatek@...ts.infradead.org>
Subject: Re: [PATCH net v2 0/2] fix two bugs related to page_pool

On 2024/9/25 15:57, Yunsheng Lin wrote:
> Patch 1 fix a possible time window problem for page_pool.
> Patch 2 fix the kernel crash problem at iommu_get_dma_domain
> reported in [1].

Hi, all

Through the discussions, it seems there are some main concerns
as below:
1. Semantics changing of supporting unlimited inflight pages
   to limited inflight pages that are as large as the pool_size
   of page_pool.
2. The overhead of finding available pool->items in
   page_pool_item_add().

Any other concerns I missed here?
As it is unclear about the impact of the above concerns, which seemed
to lead Paolo to suggest this patchset targetting net-next tree
instead of net tree, so I am planning to target the net-next tree
keeping the 'Fixes' tag for the next version, if there is any other
opinion here, please let me know.

Also, I still have the page_frag refactoring patchset pending in the
nex-next, please let me know if I should wait for that patchset to
be applied before sending this one to the net-next tree.

>