linux-kernel - Re: [PATCH v2 27/46] mm/writeback: Add __folio_mark

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Date:   Wed, 23 Jun 2021 11:27:12 +0200
From:   Christoph Hellwig <hch@...radead.org>
To:     "Matthew Wilcox (Oracle)" <willy@...radead.org>
Cc:     akpm@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 27/46] mm/writeback: Add __folio_mark_dirty()

On Tue, Jun 22, 2021 at 01:15:32PM +0100, Matthew Wilcox (Oracle) wrote:
> Turn __set_page_dirty() into a wrapper around __folio_mark_dirty() (which
> can directly cast from page to folio because we know that set_page_dirty()
> calls filesystems with the head page).  Convert account_page_dirtied()
> into folio_account_dirtied() and account the number of pages in the folio.

Is it really worth micro-optimizing a transitional function like that?
I'd rather eat the overhead of the compound_page() call over adding hacky
casts like this.