From: Andrew Morton <akpm@linux-foundation.org>
To: Stefan Roesch <shr@devkernel.io>
Cc: kernel-team@fb.com, linux-block@vger.kernel.org,
linux-mm@kvack.org, axboe@kernel.dk, clm@meta.com,
willy@infradead.org, hch@infradead.org
Subject: Re: [RFC PATCH v3 04/14] mm: use part per 1000 for bdi ratios.
Date: Wed, 16 Nov 2022 13:29:00 -0800 [thread overview]
Message-ID: <20221116132900.ab7554e7e8342c4d30739bb1@linux-foundation.org> (raw)
In-Reply-To: <20221024190603.3987969-5-shr@devkernel.io>
On Mon, 24 Oct 2022 12:05:53 -0700 Stefan Roesch <shr@devkernel.io> wrote:
> To get finer granularity for ratio calculations use part per 1000
> instead of percentiles. This is especially important if we want to
> automatically convert byte values to ratios. Otherwise the values that
> are actually used can be quite different. This is also important for
> machines with more main memory (1% of 256GB is already 2.5GB).
>
> ...
>
This changes an existing userspace interface, doesn't it?
/sys/class/bdi/<bdi>/min_ratio. Can't do that!
We could add a new interace to the same thing, I guess.
/sys/class/bdi/<bdi>/min_ratio_fine or whatever.
We might want to go for more than 100->1000, too. Otherwise in a few
years we'll be adding /sys/class/bdi/<bdi>/min_ratio_even_finer.
Also, this patch forgot to update
Documentation/ABI/testing/sysfs-class-bdi.
next prev parent reply other threads:[~2022-11-16 21:29 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-24 19:05 [RFC PATCH v3 00/14] mm/block: add bdi sysfs knobs Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 01/14] mm: add bdi_set_strict_limit() function Stefan Roesch
2022-11-16 21:28 ` Andrew Morton
2022-11-19 0:01 ` Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 02/14] mm: add knob /sys/class/bdi/<bdi>/strict_limit Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 03/14] mm: document /sys/class/bdi/<bdi>/strict_limit knob Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 04/14] mm: use part per 1000 for bdi ratios Stefan Roesch
2022-11-16 21:29 ` Andrew Morton [this message]
2022-11-19 0:03 ` Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 05/14] mm: add bdi_get_max_bytes() function Stefan Roesch
2022-11-16 21:29 ` Andrew Morton
2022-11-19 0:10 ` Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 06/14] mm: split off __bdi_set_max_ratio() function Stefan Roesch
2022-11-16 21:29 ` Andrew Morton
2022-10-24 19:05 ` [RFC PATCH v3 07/14] mm: add bdi_set_max_bytes() function Stefan Roesch
2022-11-16 21:29 ` Andrew Morton
2022-11-19 0:14 ` Stefan Roesch
2022-11-16 21:29 ` Andrew Morton
2022-11-19 0:16 ` Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 08/14] mm: add knob /sys/class/bdi/<bdi>/max_bytes Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 09/14] mm: document /sys/class/bdi/<bdi>/max_bytes knob Stefan Roesch
2022-10-24 19:05 ` [RFC PATCH v3 10/14] mm: add bdi_get_min_bytes() function Stefan Roesch
2022-11-16 21:29 ` Andrew Morton
2022-10-24 19:06 ` [RFC PATCH v3 11/14] mm: split off __bdi_set_min_ratio() function Stefan Roesch
2022-10-24 19:06 ` [RFC PATCH v3 12/14] mm: add bdi_set_min_bytes() function Stefan Roesch
2022-10-24 19:06 ` [RFC PATCH v3 13/14] mm: add /sys/class/bdi/<bdi>/min_bytes knob Stefan Roesch
2022-10-24 19:06 ` [RFC PATCH v3 14/14] mm: document " Stefan Roesch
2022-11-11 17:30 ` [RFC PATCH v3 00/14] mm/block: add bdi sysfs knobs Jens Axboe
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