From: "Christoph Lameter (Ampere)" <cl@gentwo.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
hannes@cmpxchg.org, clm@meta.com, linux-kernel@vger.kernel.org,
willy@infradead.org, kirill@shutemov.name, bfoster@redhat.com
Subject: Re: [PATCHSET v6 0/12] Uncached buffered IO
Date: Tue, 3 Dec 2024 10:23:53 -0800 (PST) [thread overview]
Message-ID: <e31a698c-09f0-c551-3dfe-646816905e65@gentwo.org> (raw)
In-Reply-To: <20241203153232.92224-2-axboe@kernel.dk>
On Tue, 3 Dec 2024, Jens Axboe wrote:
>
> So here's a new approach to the same concent, but using the page cache
> as synchronization. That makes RWF_UNCACHED less special, in that it's
> just page cache IO, except it prunes the ranges once IO is completed.
Great idea and someting that is really important these days.
However, one nit that I have is the use of the term "uncached" for a
folio/page. An uncached "page frame" refers to a page frame that requires
accesses not going through the cpu cache. I.e. device mappings. This is
an established mm/cpu term as far as I can tell.
So maybe be a bit more specific about which cache this is?
PAGE_CACHE_UNCACHED?
or use a different term. It is cached after all but only for a brief
period. So this may be a "TEMPORAL_PAGE" or so? (Similar to the x86
"non-temporal" stores).
next prev parent reply other threads:[~2024-12-03 18:23 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-12-03 15:31 Jens Axboe
2024-12-03 15:31 ` [PATCH 01/12] mm/filemap: change filemap_create_folio() to take a struct kiocb Jens Axboe
2024-12-10 11:13 ` Christoph Hellwig
2024-12-12 15:49 ` Jens Axboe
2024-12-03 15:31 ` [PATCH 02/12] mm/readahead: add folio allocation helper Jens Axboe
2024-12-03 15:31 ` [PATCH 03/12] mm: add PG_uncached page flag Jens Axboe
2024-12-03 15:31 ` [PATCH 04/12] mm/readahead: add readahead_control->uncached member Jens Axboe
2024-12-03 15:31 ` [PATCH 05/12] mm/filemap: use page_cache_sync_ra() to kick off read-ahead Jens Axboe
2024-12-10 11:15 ` Christoph Hellwig
2024-12-03 15:31 ` [PATCH 06/12] mm/truncate: add folio_unmap_invalidate() helper Jens Axboe
2024-12-10 11:21 ` Christoph Hellwig
2024-12-12 20:19 ` Jens Axboe
2024-12-03 15:31 ` [PATCH 07/12] fs: add RWF_UNCACHED iocb and FOP_UNCACHED file_operations flag Jens Axboe
2024-12-06 17:35 ` Darrick J. Wong
2024-12-10 11:22 ` Christoph Hellwig
2024-12-12 19:42 ` Jens Axboe
2024-12-03 15:31 ` [PATCH 08/12] mm/filemap: add read support for RWF_UNCACHED Jens Axboe
2024-12-03 15:31 ` [PATCH 09/12] mm/filemap: drop uncached pages when writeback completes Jens Axboe
2024-12-03 15:31 ` [PATCH 10/12] mm/filemap: add filemap_fdatawrite_range_kick() helper Jens Axboe
2024-12-03 15:31 ` [PATCH 11/12] mm/filemap: make buffered writes work with RWF_UNCACHED Jens Axboe
2024-12-06 17:17 ` Darrick J. Wong
2024-12-06 18:22 ` Jens Axboe
2024-12-10 11:31 ` Christoph Hellwig
2024-12-12 15:51 ` Jens Axboe
2024-12-03 15:31 ` [PATCH 12/12] mm: add FGP_UNCACHED folio creation flag Jens Axboe
2024-12-03 18:23 ` Christoph Lameter (Ampere) [this message]
2024-12-03 21:06 ` [PATCHSET v6 0/12] Uncached buffered IO Jens Axboe
2024-12-03 22:16 ` Christoph Lameter (Ampere)
2024-12-03 22:41 ` Jens Axboe
2024-12-04 5:52 ` Darrick J. Wong
2024-12-04 16:36 ` Jens Axboe
2024-12-10 11:11 ` Christoph Hellwig
2024-12-12 15:48 ` Jens Axboe
2024-12-12 16:59 ` Christoph Lameter (Ampere)
2024-12-12 19:14 ` Jens Axboe
2024-12-12 19:35 ` Matthew Wilcox
2024-12-12 19:36 ` Jens Axboe
2024-12-12 20:06 ` Christoph Lameter (Ampere)
2024-12-13 5:04 ` Johannes Weiner
2024-12-13 14:49 ` Jens Axboe
2024-12-06 17:37 ` Darrick J. Wong
2024-12-10 9:48 ` Bharata B Rao
2024-12-12 15:46 ` Jens Axboe
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