Re: [PATCH 19/31] ext4: Convert ext4_journalled_zero_new_buffers() to use a folio

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To: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Subject: Re: [PATCH 19/31] ext4: Convert ext4_journalled_zero_new_buffers() to use a folio
From: "Theodore Ts'o" <tytso@xxxxxxx>
Date: Tue, 14 Mar 2023 18:46:19 -0400
Cc: Andreas Dilger <adilger.kernel@xxxxxxxxx>, linux-ext4@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx
In-reply-to: <20230126202415.1682629-20-willy@infradead.org>
References: <20230126202415.1682629-1-willy@infradead.org> <20230126202415.1682629-20-willy@infradead.org>

On Thu, Jan 26, 2023 at 08:24:03PM +0000, Matthew Wilcox (Oracle) wrote:
> Remove a call to compound_head().

Same question as with other commits, plus one more; why is it notable
that calls to compound_head() are being reduced.  I've looked at the
implementation, and it doesn't look all _that_ heavyweight....

Follow-Ups:
- Re: [PATCH 19/31] ext4: Convert ext4_journalled_zero_new_buffers() to use a folio
  - From: Matthew Wilcox

References:
- [PATCH 00/31] Convert most of ext4 to folios
  - From: Matthew Wilcox (Oracle)
- [PATCH 19/31] ext4: Convert ext4_journalled_zero_new_buffers() to use a folio
  - From: Matthew Wilcox (Oracle)

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