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From: Jakub Kicinski <kuba@kernel.org>
To: moyufeng <moyufeng@huawei.com>
Cc: Yunsheng Lin <linyunsheng@huawei.com>, <davem@davemloft.net>,
	<alexander.duyck@gmail.com>, <linux@armlinux.org.uk>,
	<mw@semihalf.com>, <linuxarm@openeuler.org>,
	<yisen.zhuang@huawei.com>, <salil.mehta@huawei.com>,
	<thomas.petazzoni@bootlin.com>, <hawk@kernel.org>,
	<ilias.apalodimas@linaro.org>, <ast@kernel.org>,
	<daniel@iogearbox.net>, <john.fastabend@gmail.com>,
	<akpm@linux-foundation.org>, <peterz@infradead.org>,
	<will@kernel.org>, <willy@infradead.org>, <vbabka@suse.cz>,
	<fenghua.yu@intel.com>, <guro@fb.com>, <peterx@redhat.com>,
	<feng.tang@intel.com>, <jgg@ziepe.ca>, <mcroce@microsoft.com>,
	<hughd@google.com>, <jonathan.lemon@gmail.com>, <alobakin@pm.me>,
	<willemb@google.com>, <wenxu@ucloud.cn>,
	<cong.wang@bytedance.com>, <haokexin@gmail.com>,
	<nogikh@google.com>, <elver@google.com>, <yhs@fb.com>,
	<kpsingh@kernel.org>, <andrii@kernel.org>, <kafai@fb.com>,
	<songliubraving@fb.com>, <netdev@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>, <bpf@vger.kernel.org>,
	<chenhao288@hisilicon.com>
Subject: Re: [PATCH net-next v2 4/4] net: hns3: support skb's frag page recycling based on page pool
Date: Wed, 8 Sep 2021 08:08:43 -0700	[thread overview]
Message-ID: <20210908080843.2051c58d@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com> (raw)
In-Reply-To: <2b75d66b-a3bf-2490-2f46-fef5731ed7ad@huawei.com>

On Wed, 8 Sep 2021 16:31:40 +0800 moyufeng wrote:
>     After adding page pool to hns3 receiving package process,
> we want to add some debug info. Such as below:
> 
> 1. count of page pool allocate and free page, which is defined
> for pages_state_hold_cnt and pages_state_release_cnt in page
> pool framework.
> 
> 2. pool size、order、nid、dev、max_len, which is setted for
> each rx ring in hns3 driver.
> 
> In this regard, we consider two ways to show these info:
> 
> 1. Add it to queue statistics and query it by ethtool -S.
> 
> 2. Add a file node "page_pool_info" for debugfs, then cat this
> file node, print as below:
> 
> queue_id  allocate_cnt  free_cnt  pool_size  order  nid  dev  max_len
> 000		   xxx       xxx        xxx    xxx  xxx  xxx      xxx
> 001
> 002
> .
> .
> 	
> Which one is more acceptable, or would you have some other suggestion?

Normally I'd say put the stats in ethtool -S and the rest in debugfs
but I'm not sure if exposing pages_state_hold_cnt and
pages_state_release_cnt directly. Those are short counters, and will
very likely wrap. They are primarily meaningful for calculating
page_pool_inflight(). Given this I think their semantics may be too
confusing for an average ethtool -S user.

Putting all the information in debugfs seems like a better idea.

  reply	other threads:[~2021-09-08 15:08 UTC|newest]

Thread overview: 19+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-06  2:46 [PATCH net-next v2 0/4] add frag page support in " Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 1/4] page_pool: keep pp info as long as page pool owns the page Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 2/4] page_pool: add interface to manipulate frag count in page pool Yunsheng Lin
2021-08-10 14:58   ` Jesper Dangaard Brouer
2021-08-11  0:48     ` Yunsheng Lin
2021-08-12 15:17   ` Jesper Dangaard Brouer
2021-08-06  2:46 ` [PATCH net-next v2 3/4] page_pool: add frag page recycling support " Yunsheng Lin
2021-08-06  2:46 ` [PATCH net-next v2 4/4] net: hns3: support skb's frag page recycling based on " Yunsheng Lin
2021-09-08  8:31   ` moyufeng
2021-09-08 15:08     ` Jakub Kicinski [this message]
2021-09-08 15:26       ` Ilias Apalodimas
2021-09-08 15:57         ` Jakub Kicinski
2021-09-08 16:47           ` Jesper Dangaard Brouer
2021-09-08 16:51           ` Ilias Apalodimas
2021-08-10 14:01 ` [PATCH net-next v2 0/4] add frag page support in " Jakub Kicinski
2021-08-10 14:23   ` Jesper Dangaard Brouer
2021-08-10 14:43     ` Jakub Kicinski
2021-08-10 15:09       ` Alexander Duyck
2021-08-11  1:06         ` [Linuxarm] " Yunsheng Lin

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