linux-kernel - Re: [PATCH v4 3/4] writeback: add wb_monitor.py script to monitor writeback info on bdi

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Message-ID: <ZiatVDpNb59kmT9V@slm.duckdns.org>
Date: Mon, 22 Apr 2024 08:32:52 -1000
From: Tejun Heo <tj@...nel.org>
To: Kemeng Shi <shikemeng@...weicloud.com>
Cc: akpm@...ux-foundation.org, willy@...radead.org, jack@...e.cz,
	bfoster@...hat.com, dsterba@...e.com, mjguzik@...il.com,
	dhowells@...hat.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH v4 3/4] writeback: add wb_monitor.py script to monitor
 writeback info on bdi

On Tue, Apr 23, 2024 at 12:48:07AM +0800, Kemeng Shi wrote:
> Add wb_monitor.py script to monitor writeback information on backing dev
> which makes it easier and more convenient to observe writeback behaviors
> of running system.
> 
> The wb_monitor.py script is written based on wq_monitor.py.
> 
> Following domain hierarchy is tested:
>                 global domain (320G)
>                 /                 \
>         cgroup domain1(10G)     cgroup domain2(10G)
>                 |                 |
> bdi            wb1               wb2
> 
> The wb_monitor.py script output is as following:
> ./wb_monitor.py 252:16 -c
>                   writeback  reclaimable   dirtied   written    avg_bw
> 252:16_1                  0            0         0         0    102400
> 252:16_4284             672       820064   9230368   8410304    685612
> 252:16_4325             896       819840  10491264   9671648    652348
> 252:16                 1568      1639904  19721632  18081952   1440360
> 
>                   writeback  reclaimable   dirtied   written    avg_bw
> 252:16_1                  0            0         0         0    102400
> 252:16_4284             672       820064   9230368   8410304    685612
> 252:16_4325             896       819840  10491264   9671648    652348
> 252:16                 1568      1639904  19721632  18081952   1440360
> ...
> 
> Signed-off-by: Kemeng Shi <shikemeng@...weicloud.com>
> Suggested-by: Tejun Heo <tj@...nel.org>

Acked-by: Tejun Heo <tj@...nel.org>

Thanks.

-- 
tejun