netdev - Re: [PATCH v1] cgroup/rstat: add cgroup_rstat_cpu

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Message-ID: <4m3x4rtztwxctwlq2pdorgbv2hblylnuc2haz7ni4ti52n57xi@utxkr5ripqp2>
Date: Thu, 2 May 2024 12:44:39 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Jesper Dangaard Brouer <hawk@...nel.org>
Cc: Waiman Long <longman@...hat.com>, tj@...nel.org, hannes@...xchg.org, 
	lizefan.x@...edance.com, cgroups@...r.kernel.org, yosryahmed@...gle.com, 
	netdev@...r.kernel.org, linux-mm@...ck.org, kernel-team@...udflare.com, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Subject: Re: [PATCH v1] cgroup/rstat: add cgroup_rstat_cpu_lock helpers and
 tracepoints

On Wed, May 01, 2024 at 07:22:26PM +0200, Jesper Dangaard Brouer wrote:
> 
[...]
> 
> More data, the histogram of time spend under the lock have some strange
> variation issues with a group in 4ms to 65ms area. Investigating what
> can be causeing this... which next step depend in these tracepoints.
> 
> @lock_cnt: 759146
> 
> @locked_ns:
> [1K, 2K)             499 |      |
> [2K, 4K)          206928
> |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
> [4K, 8K)          147904 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@      |
> [8K, 16K)          64453 |@@@@@@@@@@@@@@@@      |
> [16K, 32K)        135467 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@      |
> [32K, 64K)         75943 |@@@@@@@@@@@@@@@@@@@      |
> [64K, 128K)        38359 |@@@@@@@@@      |
> [128K, 256K)       46597 |@@@@@@@@@@@      |
> [256K, 512K)       32466 |@@@@@@@@      |
> [512K, 1M)          3945 |      |
> [1M, 2M)             642 |      |
> [2M, 4M)             750 |      |
> [4M, 8M)            1932 |      |
> [8M, 16M)           2114 |      |
> [16M, 32M)          1039 |      |
> [32M, 64M)           108 |      |
> 

Am I understanding correctly that 1K is 1 microsecond and 1M is 1
millisecond? Is it possible to further divide this table into update
side and flush side?