Messages in this thread | | | Date | Mon, 28 Jun 2021 07:03:26 +0100 | From | Christoph Hellwig <> | Subject | Re: [PATCH v2 27/46] mm/writeback: Add __folio_mark_dirty() |
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On Thu, Jun 24, 2021 at 07:37:30PM +0100, Matthew Wilcox wrote: > On Wed, Jun 23, 2021 at 11:27:12AM +0200, Christoph Hellwig wrote: > > 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. > > Fair enough. There's only three calls to it and one of them goes away > this series.
The other option would be a helper that asserts a page is not a tail page and then do the cast to document the assumptions.
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