From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: akpm@linux-foundation.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux-fsdevel@vger.kernel.org
Subject: [PATCH v13a 00/32] Memory folios
Date: Mon, 12 Jul 2021 20:01:32 +0100 [thread overview]
Message-ID: <20210712190204.80979-1-willy@infradead.org> (raw)
Managing memory in 4KiB pages is a serious overhead. Many benchmarks
benefit from managing memory in larger chunks. As an example, an earlier
iteration of this idea which used compound pages (and wasn't particularly
tuned) got a 7% performance boost when compiling the kernel.
Using compound pages or THPs exposes a weakness of our type system.
Functions are often unprepared for compound pages to be passed to them,
and may only act on PAGE_SIZE chunks. Even functions which are aware of
compound pages may expect a head page, and do the wrong thing if passed
a tail page.
We also waste a lot of instructions ensuring that we're not looking at
a tail page. Almost every call to PageFoo() contains one or more hidden
calls to compound_head(). This also happens for get_page(), put_page()
and many more functions.
This patch series uses a new type, the struct folio, to manage memory.
It provides some basic infrastructure that's worthwhile in its own right,
shrinking the kernel by about 6kB of text.
-- 8< --
This is the first batch of patches for the next merge window. They are
identical to the ones sent yesterday to linux-kernel and the build bots
didn't complain about any of these. They have been extensively reviewed.
Please apply.
Matthew Wilcox (Oracle) (32):
mm: Convert get_page_unless_zero() to return bool
mm: Introduce struct folio
mm: Add folio_pgdat(), folio_zone() and folio_zonenum()
mm/vmstat: Add functions to account folio statistics
mm/debug: Add VM_BUG_ON_FOLIO() and VM_WARN_ON_ONCE_FOLIO()
mm: Add folio reference count functions
mm: Add folio_put()
mm: Add folio_get()
mm: Add folio_try_get_rcu()
mm: Add folio flag manipulation functions
mm/lru: Add folio LRU functions
mm: Handle per-folio private data
mm/filemap: Add folio_index(), folio_file_page() and folio_contains()
mm/filemap: Add folio_next_index()
mm/filemap: Add folio_pos() and folio_file_pos()
mm/util: Add folio_mapping() and folio_file_mapping()
mm/filemap: Add folio_unlock()
mm/filemap: Add folio_lock()
mm/filemap: Add folio_lock_killable()
mm/filemap: Add __folio_lock_async()
mm/filemap: Add folio_wait_locked()
mm/filemap: Add __folio_lock_or_retry()
mm/swap: Add folio_rotate_reclaimable()
mm/filemap: Add folio_end_writeback()
mm/writeback: Add folio_wait_writeback()
mm/writeback: Add folio_wait_stable()
mm/filemap: Add folio_wait_bit()
mm/filemap: Add folio_wake_bit()
mm/filemap: Convert page wait queues to be folios
mm/filemap: Add folio private_2 functions
fs/netfs: Add folio fscache functions
mm: Add folio_mapped()
Documentation/core-api/mm-api.rst | 4 +
Documentation/filesystems/netfs_library.rst | 2 +
fs/afs/write.c | 9 +-
fs/cachefiles/rdwr.c | 16 +-
fs/io_uring.c | 2 +-
include/linux/huge_mm.h | 15 -
include/linux/mm.h | 165 +++++++--
include/linux/mm_inline.h | 85 +++--
include/linux/mm_types.h | 77 ++++
include/linux/mmdebug.h | 20 +
include/linux/netfs.h | 77 ++--
include/linux/page-flags.h | 247 +++++++++----
include/linux/page_ref.h | 158 +++++++-
include/linux/pagemap.h | 390 +++++++++++---------
include/linux/swap.h | 7 +-
include/linux/vmstat.h | 107 ++++++
mm/Makefile | 2 +-
mm/filemap.c | 329 +++++++++--------
mm/folio-compat.c | 43 +++
mm/internal.h | 1 +
mm/memory.c | 8 +-
mm/page-writeback.c | 72 ++--
mm/page_io.c | 4 +-
mm/swap.c | 30 +-
mm/swapfile.c | 8 +-
mm/util.c | 59 +--
26 files changed, 1356 insertions(+), 581 deletions(-)
create mode 100644 mm/folio-compat.c
--
2.30.2
next reply other threads:[~2021-07-12 19:02 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-12 19:01 Matthew Wilcox (Oracle) [this message]
2021-07-12 19:01 ` [PATCH v13 01/32] mm: Convert get_page_unless_zero() to return bool Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 02/32] mm: Introduce struct folio Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 03/32] mm: Add folio_pgdat(), folio_zone() and folio_zonenum() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 04/32] mm/vmstat: Add functions to account folio statistics Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 05/32] mm/debug: Add VM_BUG_ON_FOLIO() and VM_WARN_ON_ONCE_FOLIO() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 06/32] mm: Add folio reference count functions Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 07/32] mm: Add folio_put() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 08/32] mm: Add folio_get() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 09/32] mm: Add folio_try_get_rcu() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 10/32] mm: Add folio flag manipulation functions Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 11/32] mm/lru: Add folio LRU functions Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 12/32] mm: Handle per-folio private data Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 13/32] mm/filemap: Add folio_index(), folio_file_page() and folio_contains() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 14/32] mm/filemap: Add folio_next_index() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 15/32] mm/filemap: Add folio_pos() and folio_file_pos() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 16/32] mm/util: Add folio_mapping() and folio_file_mapping() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 17/32] mm/filemap: Add folio_unlock() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 18/32] mm/filemap: Add folio_lock() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 19/32] mm/filemap: Add folio_lock_killable() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 20/32] mm/filemap: Add __folio_lock_async() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 21/32] mm/filemap: Add folio_wait_locked() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 22/32] mm/filemap: Add __folio_lock_or_retry() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 23/32] mm/swap: Add folio_rotate_reclaimable() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 24/32] mm/filemap: Add folio_end_writeback() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 25/32] mm/writeback: Add folio_wait_writeback() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 26/32] mm/writeback: Add folio_wait_stable() Matthew Wilcox (Oracle)
2021-07-12 19:01 ` [PATCH v13 27/32] mm/filemap: Add folio_wait_bit() Matthew Wilcox (Oracle)
2021-07-12 19:02 ` [PATCH v13 28/32] mm/filemap: Add folio_wake_bit() Matthew Wilcox (Oracle)
2021-07-12 19:02 ` [PATCH v13 29/32] mm/filemap: Convert page wait queues to be folios Matthew Wilcox (Oracle)
2021-07-12 19:02 ` [PATCH v13 30/32] mm/filemap: Add folio private_2 functions Matthew Wilcox (Oracle)
2021-07-12 19:02 ` [PATCH v13 31/32] fs/netfs: Add folio fscache functions Matthew Wilcox (Oracle)
2021-07-12 19:02 ` [PATCH v13 32/32] mm: Add folio_mapped() Matthew Wilcox (Oracle)
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