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From: Matthew Wilcox <willy@infradead.org>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	linux-fsdevel@vger.kernel.org, linux-cachefs@redhat.com,
	linux-afs@lists.infradead.org, Christoph Hellwig <hch@lst.de>,
	Jeff Layton <jlayton@kernel.org>
Subject: Re: [PATCH v7 09/28] mm: Create FolioFlags
Date: Mon, 19 Apr 2021 14:55:28 +0100	[thread overview]
Message-ID: <20210419135528.GC2531743@casper.infradead.org> (raw)
In-Reply-To: <YH2E2jNvhEOwCinT@hirez.programming.kicks-ass.net>

On Mon, Apr 19, 2021 at 03:25:46PM +0200, Peter Zijlstra wrote:
> On Fri, Apr 09, 2021 at 07:50:46PM +0100, Matthew Wilcox (Oracle) wrote:
> > These new functions are the folio analogues of the PageFlags functions.
> > If CONFIG_DEBUG_VM_PGFLAGS is enabled, we check the folio is not a tail
> > page at every invocation.  Note that this will also catch the PagePoisoned
> > case as a poisoned page has every bit set, which would include PageTail.
> > 
> > This saves 1727 bytes of text with the distro-derived config that
> > I'm testing due to removing a double call to compound_head() in
> > PageSwapCache().
> 
> I vote for dropping the Camels if we're going to rework all this.

I'm open to that.  It's a bit of rework now, but easier to do it as
part of this than as a separate series.

So, concretely:

PageReferences() becomes folio_referenced()
SetPageReferenced() becomes folio_set_referenced()
ClearPageReferenced() becomes folio_clear_referenced()
__SetFolioReferenced() becomes __folio_set_referenced()
__ClearFolioReferenced() becomes __folio_clear_referenced()
TestSetPageReferenced() becomes folio_test_set_referenced()
TestClearPageReferenced() becomes folio_test_clear_referenced()

We do have some functions already like set_page_writeback(), but I
think those can become folio_set_writeback() without doing any harm.
We also have page_is_young(), page_is_pfmemalloc(), page_is_guard(),
etc.  Should it be folio_referenced()?  or folio_is_referenced()?



      reply	other threads:[~2021-04-19 13:57 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-09 18:50 [PATCH v7 00/28] Memory Folios Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 01/28] mm: Optimise nth_page for contiguous memmap Matthew Wilcox (Oracle)
2021-04-12  6:08   ` Christoph Hellwig
2021-04-09 18:50 ` [PATCH v7 04/28] mm/vmstat: Add functions to account folio statistics Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 05/28] mm/debug: Add VM_BUG_ON_FOLIO and VM_WARN_ON_ONCE_FOLIO Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 07/28] mm: Add put_folio Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 08/28] mm: Add get_folio Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 11/28] mm/filemap: Add folio_index, folio_file_page and folio_contains Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 12/28] mm/filemap: Add folio_next_index Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 15/28] mm: Add folio_mapcount Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 16/28] mm/memcg: Add folio wrappers for various functions Matthew Wilcox (Oracle)
2021-04-09 18:51 ` [PATCH v7 25/28] mm/writeback: Add wait_for_stable_folio Matthew Wilcox (Oracle)
2021-04-09 18:51 ` [PATCH v7 27/28] mm/filemap: Convert wake_up_page_bit to wake_up_folio_bit Matthew Wilcox (Oracle)
     [not found] ` <20210409185105.188284-3-willy@infradead.org>
2021-04-09 22:45   ` [PATCH v7 02/28] mm: Introduce struct folio kernel test robot
2021-04-10  2:43     ` Bogus struct page layout on 32-bit Matthew Wilcox
2021-04-10  6:21       ` Jesper Dangaard Brouer
2021-04-10  8:52         ` Ilias Apalodimas
2021-04-10 14:06           ` Matthew Wilcox
2021-04-10 15:54             ` Russell King - ARM Linux admin
2021-04-16  9:26           ` Grygorii Strashko
2021-04-16 14:10             ` Arnd Bergmann
2021-04-17 13:08             ` David Laight
2021-04-10 14:17       ` David Laight
2021-04-10 19:10       ` Arnd Bergmann
2021-04-11 22:35         ` Matthew Wilcox
2021-04-10  2:51   ` [PATCH v7 02/28] mm: Introduce struct folio kernel test robot
2021-04-16 15:55   ` Matthew Wilcox
2021-04-19  9:06     ` Kirill A. Shutemov
     [not found] ` <20210409185105.188284-10-willy@infradead.org>
2021-04-19 13:25   ` [PATCH v7 09/28] mm: Create FolioFlags Peter Zijlstra
2021-04-19 13:55     ` Matthew Wilcox [this message]

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