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From: Kent Overstreet <kent.overstreet@linux.dev>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: "Darrick J. Wong" <djwong@kernel.org>,
	linux-bcachefs@vger.kernel.org,  linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org
Subject: Re: [GIT PULL] bcachefs updates for 6.9
Date: Wed, 13 Mar 2024 18:22:57 -0400	[thread overview]
Message-ID: <hbncybkxmlxqukxvfcxcnlc53nrna3hawykbovq3h3u5xpm7iy@6ay4wjnpuqs4> (raw)
In-Reply-To: <CAHk-=whbgtooUErM9bOP2iWimndpkPLaPy1YZmbmHACU07h3Mw@mail.gmail.com>

On Wed, Mar 13, 2024 at 02:51:38PM -0700, Linus Torvalds wrote:
> On Wed, 13 Mar 2024 at 14:34, Kent Overstreet <kent.overstreet@linux.dev> wrote:
> >
> > I liked your MAD suggestion, but the catch was that we need an
> > exponentially weighted version,
> 
> The code for the weighted version literally doesn't change.

Well, no, and there's another problem I can't believe I missed until
now. MAD is defined as median of the absolute deviations, not mean, and
you can't compute a median incrementally.

So MAD doesn't work here at all.

  reply	other threads:[~2024-03-13 22:23 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-03-13  1:10 [GIT PULL] bcachefs updates for 6.9 Kent Overstreet
2024-03-13 20:47 ` Linus Torvalds
2024-03-13 21:34   ` Kent Overstreet
2024-03-13 21:51     ` Linus Torvalds
2024-03-13 22:22       ` Kent Overstreet [this message]
2024-03-13 22:28         ` Kent Overstreet
2024-03-14 17:15           ` Linus Torvalds

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