From: David Laight <David.Laight@ACULAB.COM>
To: 'Kent Overstreet' <kent.overstreet@linux.dev>,
Lorenzo Stoakes <lstoakes@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-bcachefs@vger.kernel.org" <linux-bcachefs@vger.kernel.org>,
Kent Overstreet <kent.overstreet@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Uladzislau Rezki <urezki@gmail.com>,
"linux-mm@kvack.org" <linux-mm@kvack.org>
Subject: RE: [PATCH 07/32] mm: Bring back vmalloc_exec
Date: Wed, 10 May 2023 11:56:05 +0000 [thread overview]
Message-ID: <aa542818337b4157bfdcf262926b9fe3@AcuMS.aculab.com> (raw)
In-Reply-To: <ZFq7JhrhyrMTNfd/@moria.home.lan>
From: Kent Overstreet
> Sent: 09 May 2023 22:29
...
> The background is that bcachefs generates a per btree node unpack
> function, based on the packed format for that btree node, for unpacking
> keys within that node. The unpack function is only ~50 bytes, and for
> locality we want it to be located with the btree node's other in-memory
> lookup tables so they can be prefetched all at once.
Loading data into the d-cache isn't going to load code into
the i-cache.
Indeed you don't want to be mixing code and data in the same
cache line - because it just wastes space in the cache.
Looks to me like you could have a few different unpack
functions and pick the correct one based on the packed format.
Quite likely the code would be just as fast (if longer)
when you allow for parallel execution on modern cpu.
David
-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
next prev parent reply other threads:[~2023-05-10 11:56 UTC|newest]
Thread overview: 186+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-09 16:56 [PATCH 00/32] bcachefs - a new COW filesystem Kent Overstreet
2023-05-09 16:56 ` [PATCH 01/32] Compiler Attributes: add __flatten Kent Overstreet
2023-05-09 17:04 ` Miguel Ojeda
2023-05-09 17:24 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 02/32] locking/lockdep: lock_class_is_held() Kent Overstreet
2023-05-09 19:30 ` Peter Zijlstra
2023-05-09 20:11 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 03/32] locking/lockdep: lockdep_set_no_check_recursion() Kent Overstreet
2023-05-09 19:31 ` Peter Zijlstra
2023-05-09 19:57 ` Kent Overstreet
2023-05-09 20:18 ` Kent Overstreet
2023-05-09 20:27 ` Waiman Long
2023-05-09 20:35 ` Kent Overstreet
2023-05-09 21:37 ` Waiman Long
2023-05-10 8:59 ` Peter Zijlstra
2023-05-10 20:38 ` Kent Overstreet
2023-05-11 8:25 ` Peter Zijlstra
2023-05-11 9:32 ` Kent Overstreet
2023-05-12 20:49 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 04/32] locking: SIX locks (shared/intent/exclusive) Kent Overstreet
2023-05-11 12:14 ` Jan Engelhardt
2023-05-12 20:58 ` Kent Overstreet
2023-05-12 22:39 ` Jan Engelhardt
2023-05-12 23:26 ` Kent Overstreet
2023-05-12 23:49 ` Randy Dunlap
2023-05-13 0:17 ` Kent Overstreet
2023-05-13 0:45 ` Eric Biggers
2023-05-13 0:51 ` Kent Overstreet
2023-05-14 12:15 ` Jeff Layton
2023-05-15 2:39 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 05/32] MAINTAINERS: Add entry for six locks Kent Overstreet
2023-05-09 16:56 ` [PATCH 06/32] sched: Add task_struct->faults_disabled_mapping Kent Overstreet
2023-05-10 1:07 ` Jan Kara
2023-05-10 6:18 ` Kent Overstreet
2023-05-23 13:34 ` Jan Kara
2023-05-23 16:21 ` [Cluster-devel] " Christoph Hellwig
2023-05-23 16:35 ` Kent Overstreet
2023-05-24 6:43 ` Christoph Hellwig
2023-05-24 8:09 ` Kent Overstreet
2023-05-25 8:58 ` Christoph Hellwig
2023-05-25 20:50 ` Kent Overstreet
2023-05-26 8:06 ` Christoph Hellwig
2023-05-26 8:34 ` Kent Overstreet
2023-05-25 21:40 ` Kent Overstreet
2023-05-25 22:25 ` Andreas Grünbacher
2023-05-25 23:20 ` Kent Overstreet
2023-05-26 0:05 ` Andreas Grünbacher
2023-05-26 0:39 ` Kent Overstreet
2023-05-26 8:10 ` Christoph Hellwig
2023-05-26 8:38 ` Kent Overstreet
2023-05-23 16:49 ` Kent Overstreet
2023-05-25 8:47 ` Jan Kara
2023-05-25 21:36 ` Kent Overstreet
2023-05-25 22:45 ` Andreas Grünbacher
2023-05-25 22:04 ` Andreas Grünbacher
2023-05-09 16:56 ` [PATCH 07/32] mm: Bring back vmalloc_exec Kent Overstreet
2023-05-09 18:19 ` Lorenzo Stoakes
2023-05-09 20:15 ` Kent Overstreet
2023-05-09 20:46 ` Christoph Hellwig
2023-05-09 21:12 ` Lorenzo Stoakes
2023-05-09 21:29 ` Kent Overstreet
2023-05-10 6:48 ` Eric Biggers
2023-05-12 18:36 ` Kent Overstreet
2023-05-13 1:57 ` Eric Biggers
2023-05-13 19:28 ` Kent Overstreet
2023-05-14 5:45 ` Kent Overstreet
2023-05-14 18:43 ` Eric Biggers
2023-05-15 5:38 ` Kent Overstreet
2023-05-15 6:13 ` Eric Biggers
2023-05-15 6:18 ` Kent Overstreet
2023-05-15 7:13 ` Eric Biggers
2023-05-15 7:26 ` Kent Overstreet
2023-05-21 21:33 ` Eric Biggers
2023-05-21 22:04 ` Kent Overstreet
2023-05-15 10:29 ` David Laight
2023-05-10 11:56 ` David Laight [this message]
2023-05-09 21:43 ` Darrick J. Wong
2023-05-09 21:54 ` Kent Overstreet
2023-05-11 5:33 ` Theodore Ts'o
2023-05-11 5:44 ` Kent Overstreet
2023-05-13 13:25 ` Lorenzo Stoakes
2023-05-14 18:39 ` Christophe Leroy
2023-05-14 23:43 ` Kent Overstreet
2023-05-15 4:45 ` Christophe Leroy
2023-05-15 5:02 ` Kent Overstreet
2023-05-10 14:18 ` Christophe Leroy
2023-05-10 15:05 ` Johannes Thumshirn
2023-05-11 22:28 ` Kees Cook
2023-05-12 18:41 ` Kent Overstreet
2023-05-16 21:02 ` Kees Cook
2023-05-16 21:20 ` Kent Overstreet
2023-05-16 21:47 ` Matthew Wilcox
2023-05-16 21:57 ` Kent Overstreet
2023-05-17 5:28 ` Kent Overstreet
2023-05-17 14:04 ` Mike Rapoport
2023-05-17 14:18 ` Kent Overstreet
2023-05-17 15:44 ` Mike Rapoport
2023-05-17 15:59 ` Kent Overstreet
2023-06-17 4:13 ` Andy Lutomirski
2023-06-17 15:34 ` Kent Overstreet
2023-06-17 19:19 ` Andy Lutomirski
2023-06-17 20:08 ` Kent Overstreet
2023-06-17 20:35 ` Andy Lutomirski
2023-06-19 19:45 ` Kees Cook
2023-06-20 0:39 ` Kent Overstreet
2023-06-19 9:19 ` Mark Rutland
2023-06-19 10:47 ` Kent Overstreet
2023-06-19 12:47 ` Mark Rutland
2023-06-19 19:17 ` Kent Overstreet
2023-06-20 17:42 ` Andy Lutomirski
2023-06-20 18:08 ` Kent Overstreet
2023-06-20 18:15 ` Andy Lutomirski
2023-06-20 18:48 ` Dave Hansen
2023-06-20 20:18 ` Kent Overstreet
2023-06-20 20:42 ` Andy Lutomirski
2023-06-20 22:32 ` Andy Lutomirski
2023-06-20 22:43 ` Nadav Amit
2023-06-21 1:27 ` Andy Lutomirski
2023-05-09 16:56 ` [PATCH 08/32] fs: factor out d_mark_tmpfile() Kent Overstreet
2023-05-09 16:56 ` [PATCH 09/32] block: Add some exports for bcachefs Kent Overstreet
2023-05-09 16:56 ` [PATCH 10/32] block: Allow bio_iov_iter_get_pages() with bio->bi_bdev unset Kent Overstreet
2023-05-09 16:56 ` [PATCH 11/32] block: Bring back zero_fill_bio_iter Kent Overstreet
2023-05-09 16:56 ` [PATCH 12/32] block: Rework bio_for_each_segment_all() Kent Overstreet
2023-05-09 16:56 ` [PATCH 13/32] block: Rework bio_for_each_folio_all() Kent Overstreet
2023-05-09 16:56 ` [PATCH 14/32] block: Don't block on s_umount from __invalidate_super() Kent Overstreet
2023-05-09 16:56 ` [PATCH 15/32] bcache: move closures to lib/ Kent Overstreet
2023-05-10 1:10 ` Randy Dunlap
2023-05-09 16:56 ` [PATCH 16/32] MAINTAINERS: Add entry for closures Kent Overstreet
2023-05-09 17:05 ` Coly Li
2023-05-09 21:03 ` Randy Dunlap
2023-05-09 16:56 ` [PATCH 17/32] closures: closure_wait_event() Kent Overstreet
2023-05-09 16:56 ` [PATCH 18/32] closures: closure_nr_remaining() Kent Overstreet
2023-05-09 16:56 ` [PATCH 19/32] closures: Add a missing include Kent Overstreet
2023-05-09 16:56 ` [PATCH 20/32] vfs: factor out inode hash head calculation Kent Overstreet
2023-05-23 9:27 ` (subset) " Christian Brauner
2023-05-23 22:53 ` Dave Chinner
2023-05-24 6:44 ` Christoph Hellwig
2023-05-24 7:35 ` Dave Chinner
2023-05-24 8:31 ` Christian Brauner
2023-05-24 8:41 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 21/32] hlist-bl: add hlist_bl_fake() Kent Overstreet
2023-05-10 4:48 ` Dave Chinner
2023-05-23 9:27 ` (subset) " Christian Brauner
2023-05-09 16:56 ` [PATCH 22/32] vfs: inode cache conversion to hash-bl Kent Overstreet
2023-05-10 4:45 ` Dave Chinner
2023-05-16 15:45 ` Christian Brauner
2023-05-16 16:17 ` Kent Overstreet
2023-05-16 23:15 ` Dave Chinner
2023-05-22 13:04 ` Christian Brauner
2023-05-23 9:28 ` (subset) " Christian Brauner
2023-10-19 15:30 ` Mateusz Guzik
2023-10-19 15:59 ` Mateusz Guzik
2023-10-20 11:38 ` Dave Chinner
2023-10-20 17:49 ` Mateusz Guzik
2023-10-21 12:13 ` Mateusz Guzik
2023-10-23 5:10 ` Dave Chinner
2023-10-27 17:13 ` Mateusz Guzik
2023-10-27 18:36 ` Darrick J. Wong
2023-10-31 11:02 ` Christian Brauner
2023-10-31 11:31 ` Mateusz Guzik
2023-11-02 2:36 ` Kent Overstreet
2023-11-04 20:51 ` Dave Chinner
2023-05-09 16:56 ` [PATCH 23/32] iov_iter: copy_folio_from_iter_atomic() Kent Overstreet
2023-05-10 2:20 ` kernel test robot
2023-05-11 2:08 ` kernel test robot
2023-05-09 16:56 ` [PATCH 24/32] MAINTAINERS: Add entry for generic-radix-tree Kent Overstreet
2023-05-09 21:03 ` Randy Dunlap
2023-05-09 16:56 ` [PATCH 25/32] lib/generic-radix-tree.c: Don't overflow in peek() Kent Overstreet
2023-05-09 16:56 ` [PATCH 26/32] lib/generic-radix-tree.c: Add a missing include Kent Overstreet
2023-05-09 16:56 ` [PATCH 27/32] lib/generic-radix-tree.c: Add peek_prev() Kent Overstreet
2023-05-09 16:56 ` [PATCH 28/32] stacktrace: Export stack_trace_save_tsk Kent Overstreet
2023-06-19 9:10 ` Mark Rutland
2023-06-19 11:16 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 29/32] lib/string_helpers: string_get_size() now returns characters wrote Kent Overstreet
2023-07-12 19:58 ` Kees Cook
2023-07-12 20:19 ` Kent Overstreet
2023-07-12 22:38 ` Kees Cook
2023-07-12 23:53 ` Kent Overstreet
2023-07-12 20:23 ` Kent Overstreet
2023-05-09 16:56 ` [PATCH 30/32] lib: Export errname Kent Overstreet
2023-05-09 16:56 ` [PATCH 31/32] lib: add mean and variance module Kent Overstreet
2023-05-09 16:56 ` [PATCH 32/32] MAINTAINERS: Add entry for bcachefs Kent Overstreet
2023-05-09 21:04 ` Randy Dunlap
2023-05-09 21:07 ` Kent Overstreet
2023-06-15 20:41 ` [PATCH 00/32] bcachefs - a new COW filesystem Pavel Machek
2023-06-15 21:26 ` Kent Overstreet
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