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From: Alexey Dobriyan <adobriyan@gmail.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: Waiman Long <longman@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Luis Chamberlain <mcgrof@kernel.org>,
	Kees Cook <keescook@chromium.org>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
	linux-fsdevel@vger.kernel.org,
	Davidlohr Bueso <dave@stgolabs.net>,
	Miklos Szeredi <miklos@szeredi.hu>,
	Daniel Colascione <dancol@google.com>,
	Dave Chinner <david@fromorbit.com>,
	Randy Dunlap <rdunlap@infradead.org>
Subject: Re: [PATCH 2/2] /proc/stat: Add sysctl parameter to control irq counts latency
Date: Mon, 7 Jan 2019 19:33:01 +0300	[thread overview]
Message-ID: <20190107163301.GA14354@avx2> (raw)
In-Reply-To: <20190107155840.GY6310@bombadil.infradead.org>

On Mon, Jan 07, 2019 at 07:58:40AM -0800, Matthew Wilcox wrote:
> On Mon, Jan 07, 2019 at 10:12:58AM -0500, Waiman Long wrote:

> > A new "fs/proc-stat-irqs-latency-ms" sysctl parameter is now added to
> 
> No.  No, no, no, no, no.  No.
> 
> Stop adding new sysctls for this kind of thing.  It's just a way to shift
> blame from us (who allegedly know what we're doing) to the sysadmin
> (who probably has better things to be doing than keeping up with the
> intricacies of development of every single piece of software running on
> their system).
> 
> Let's figure out what this _should_ be.

Yeah, let's start interrogating about which values specifically this
super sekret applications wants.

I assume CPU stats, so system call which returns CPU statistics in binary form.

> Why are you caching the _output_ of calling sprintf(), rather than caching the
> values of each interrupt?

For output caching string is better, but I'm not defending the patch.

  parent reply	other threads:[~2019-01-07 16:33 UTC|newest]

Thread overview: 22+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-01-07 15:12 [PATCH 0/2] /proc/stat: Reduce irqs counting performance overhead Waiman Long
2019-01-07 15:12 ` [PATCH 1/2] /proc/stat: Extract irqs counting code into show_stat_irqs() Waiman Long
2019-01-07 21:42   ` Kees Cook
2019-01-07 15:12 ` [PATCH 2/2] /proc/stat: Add sysctl parameter to control irq counts latency Waiman Long
2019-01-07 15:58   ` Matthew Wilcox
2019-01-07 16:07     ` Waiman Long
2019-01-07 16:14       ` Matthew Wilcox
2019-01-07 16:19         ` Waiman Long
2019-01-07 16:33     ` Alexey Dobriyan [this message]
2019-01-07 16:59       ` Waiman Long
     [not found]   ` <20190118084456.GA10690@shao2-debian>
2019-01-21 20:02     ` [LKP] [/proc/stat] 3047027b34: reaim.jobs_per_min -4.8% regression Kees Cook
2019-01-21 21:25       ` Alexey Dobriyan
2019-01-07 22:32 ` [PATCH 0/2] /proc/stat: Reduce irqs counting performance overhead Dave Chinner
2019-01-07 22:41   ` Daniel Colascione
2019-01-07 23:49     ` Alexey Dobriyan
2019-01-07 22:41   ` Waiman Long
2019-01-08  2:04     ` Dave Chinner
2019-01-08 16:11       ` Michal Hocko
2019-01-08 17:05         ` Waiman Long
2019-01-08 17:32           ` Waiman Long
2019-01-08 16:58       ` Waiman Long
2019-01-08 22:27         ` Dave Chinner

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