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Date:   Fri, 22 Jul 2022 09:58:21 -0400
From:   "Theodore Ts'o" <>
Cc:     "Theodore Ts'o" <>, Jan Kara <>
Subject: Re: [PATCH -V2 1/2] ext4: reduce computation of overhead during resize

On Wed, 20 Jul 2022 04:26:22 +0000, Kiselev, Oleg wrote:
> This patch avoids doing an O(n**2)-complexity walk through every flex group.
> Instead, it uses the already computed overhead information for the newly
> allocated space, and simply adds it to the previously calculated
> overhead stored in the superblock.  This drastically reduces the time
> taken to resize very large bigalloc filesystems (from 3+ hours for a
> 64TB fs down to milliseconds).
> [...]

Applied, thanks!  (Some slight adjustments were needed to resolve a
merge conflict.)

[1/2] ext4: reduce computation of overhead during resize
      commit: d985f3d81c0be1c673ac0462b26727b2a1aeb0d6

Best regards,
Theodore Ts'o <>

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