From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.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: [PATCH v7 20/28] mm/filemap: Add __lock_folio_async
Date: Fri, 9 Apr 2021 19:50:57 +0100 [thread overview]
Message-ID: <20210409185105.188284-21-willy@infradead.org> (raw)
In-Reply-To: <20210409185105.188284-1-willy@infradead.org>
There aren't any actual callers of lock_page_async(), so remove it.
Convert filemap_update_page() to call __lock_folio_async().
__lock_folio_async() is 21 bytes smaller than __lock_page_async(),
but the real savings come from using a folio in filemap_update_page(),
shrinking it from 514 bytes to 403 bytes, saving 111 bytes. The text
shrinks by 132 bytes in total.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
---
fs/io_uring.c | 2 +-
include/linux/pagemap.h | 17 -----------------
mm/filemap.c | 31 ++++++++++++++++---------------
3 files changed, 17 insertions(+), 33 deletions(-)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 81e5d156af1c..154fd92ab8a8 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -3142,7 +3142,7 @@ static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
}
/*
- * This is our waitqueue callback handler, registered through lock_page_async()
+ * This is our waitqueue callback handler, registered through lock_folio_async()
* when we initially tried to do the IO with the iocb armed our waitqueue.
* This gets called when the page is unlocked, and we generally expect that to
* happen when the page IO is completed and the page is now uptodate. This will
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index b23b95f771f7..c63f59d4ae60 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -716,7 +716,6 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page,
void __lock_folio(struct folio *folio);
int __lock_folio_killable(struct folio *folio);
-extern int __lock_page_async(struct page *page, struct wait_page_queue *wait);
extern int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
unsigned int flags);
void unlock_page(struct page *page);
@@ -773,22 +772,6 @@ static inline int lock_page_killable(struct page *page)
return lock_folio_killable(page_folio(page));
}
-/*
- * lock_page_async - Lock the page, unless this would block. If the page
- * is already locked, then queue a callback when the page becomes unlocked.
- * This callback can then retry the operation.
- *
- * Returns 0 if the page is locked successfully, or -EIOCBQUEUED if the page
- * was already locked and the callback defined in 'wait' was queued.
- */
-static inline int lock_page_async(struct page *page,
- struct wait_page_queue *wait)
-{
- if (!trylock_page(page))
- return __lock_page_async(page, wait);
- return 0;
-}
-
/*
* lock_page_or_retry - Lock the page, unless this would block and the
* caller indicated that it can handle a retry.
diff --git a/mm/filemap.c b/mm/filemap.c
index 2a4fa0b5fa88..9485ce2a4820 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1593,18 +1593,18 @@ int __lock_folio_killable(struct folio *folio)
}
EXPORT_SYMBOL_GPL(__lock_folio_killable);
-int __lock_page_async(struct page *page, struct wait_page_queue *wait)
+static int __lock_folio_async(struct folio *folio, struct wait_page_queue *wait)
{
- struct wait_queue_head *q = page_waitqueue(page);
+ struct wait_queue_head *q = page_waitqueue(&folio->page);
int ret = 0;
- wait->page = page;
+ wait->page = &folio->page;
wait->bit_nr = PG_locked;
spin_lock_irq(&q->lock);
__add_wait_queue_entry_tail(q, &wait->wait);
- SetPageWaiters(page);
- ret = !trylock_page(page);
+ SetFolioWaiters(folio);
+ ret = !trylock_folio(folio);
/*
* If we were successful now, we know we're still on the
* waitqueue as we're still under the lock. This means it's
@@ -2351,41 +2351,42 @@ static int filemap_update_page(struct kiocb *iocb,
struct address_space *mapping, struct iov_iter *iter,
struct page *page)
{
+ struct folio *folio = page_folio(page);
int error;
- if (!trylock_page(page)) {
+ if (!trylock_folio(folio)) {
if (iocb->ki_flags & (IOCB_NOWAIT | IOCB_NOIO))
return -EAGAIN;
if (!(iocb->ki_flags & IOCB_WAITQ)) {
- put_and_wait_on_page_locked(page, TASK_KILLABLE);
+ put_and_wait_on_page_locked(&folio->page, TASK_KILLABLE);
return AOP_TRUNCATED_PAGE;
}
- error = __lock_page_async(page, iocb->ki_waitq);
+ error = __lock_folio_async(folio, iocb->ki_waitq);
if (error)
return error;
}
- if (!page->mapping)
+ if (!folio->mapping)
goto truncated;
error = 0;
- if (filemap_range_uptodate(mapping, iocb->ki_pos, iter, page))
+ if (filemap_range_uptodate(mapping, iocb->ki_pos, iter, &folio->page))
goto unlock;
error = -EAGAIN;
if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT | IOCB_WAITQ))
goto unlock;
- error = filemap_read_page(iocb->ki_filp, mapping, page);
+ error = filemap_read_page(iocb->ki_filp, mapping, &folio->page);
if (error == AOP_TRUNCATED_PAGE)
- put_page(page);
+ put_folio(folio);
return error;
truncated:
- unlock_page(page);
- put_page(page);
+ unlock_folio(folio);
+ put_folio(folio);
return AOP_TRUNCATED_PAGE;
unlock:
- unlock_page(page);
+ unlock_folio(folio);
return error;
}
--
2.30.2
next prev parent reply other threads:[~2021-04-09 19:08 UTC|newest]
Thread overview: 47+ 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 02/28] mm: Introduce struct folio Matthew Wilcox (Oracle)
2021-04-09 22:45 ` 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
2021-04-09 18:50 ` [PATCH v7 03/28] mm: Add folio_pgdat and folio_zone Matthew Wilcox (Oracle)
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 06/28] mm: Add folio reference count functions 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 09/28] mm: Create FolioFlags Matthew Wilcox (Oracle)
2021-04-19 13:25 ` Peter Zijlstra
2021-04-19 13:55 ` Matthew Wilcox
2021-04-09 18:50 ` [PATCH v7 10/28] mm: Handle per-folio private data 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 13/28] mm/filemap: Add folio_offset and folio_file_offset Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 14/28] mm/util: Add folio_mapping and folio_file_mapping 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 18:50 ` [PATCH v7 17/28] mm/filemap: Add unlock_folio Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 18/28] mm/filemap: Add lock_folio Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 19/28] mm/filemap: Add lock_folio_killable Matthew Wilcox (Oracle)
2021-04-09 18:50 ` Matthew Wilcox (Oracle) [this message]
2021-04-09 18:50 ` [PATCH v7 21/28] mm/filemap: Add __lock_folio_or_retry Matthew Wilcox (Oracle)
2021-04-09 18:50 ` [PATCH v7 22/28] mm/filemap: Add wait_on_folio_locked Matthew Wilcox (Oracle)
2021-04-09 18:51 ` [PATCH v7 23/28] mm/filemap: Add end_folio_writeback Matthew Wilcox (Oracle)
2021-04-09 18:51 ` [PATCH v7 24/28] mm/writeback: Add wait_on_folio_writeback 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 26/28] mm/filemap: Convert wait_on_page_bit to wait_on_folio_bit 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)
2021-04-09 18:51 ` [PATCH v7 28/28] mm/filemap: Convert page wait queues to be folios Matthew Wilcox (Oracle)
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