From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: akpm@linux-foundation.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Jeff Layton <jlayton@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
Vlastimil Babka <vbabka@suse.cz>,
William Kucharski <william.kucharski@oracle.com>
Subject: [PATCH v12 20/33] mm/filemap: Add folio_lock_killable()
Date: Tue, 22 Jun 2021 12:41:05 +0100 [thread overview]
Message-ID: <20210622114118.3388190-21-willy@infradead.org> (raw)
In-Reply-To: <20210622114118.3388190-1-willy@infradead.org>
This is like lock_page_killable() but for use by callers who
know they have a folio. Convert __lock_page_killable() to be
__folio_lock_killable(). This saves one call to compound_head() per
contended call to lock_page_killable().
__folio_lock_killable() is 19 bytes smaller than __lock_page_killable()
was. filemap_fault() shrinks by 74 bytes and __lock_page_or_retry()
shrinks by 71 bytes. That's a total of 164 bytes of text saved.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: William Kucharski <william.kucharski@oracle.com>
---
include/linux/pagemap.h | 15 ++++++++++-----
mm/filemap.c | 17 +++++++++--------
2 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h
index f30b666a177e..bba73c10c9fe 100644
--- a/include/linux/pagemap.h
+++ b/include/linux/pagemap.h
@@ -653,7 +653,7 @@ static inline bool wake_page_match(struct wait_page_queue *wait_page,
}
void __folio_lock(struct folio *folio);
-extern int __lock_page_killable(struct page *page);
+int __folio_lock_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);
@@ -693,6 +693,14 @@ static inline void lock_page(struct page *page)
__folio_lock(folio);
}
+static inline int folio_lock_killable(struct folio *folio)
+{
+ might_sleep();
+ if (!folio_trylock(folio))
+ return __folio_lock_killable(folio);
+ return 0;
+}
+
/*
* lock_page_killable is like lock_page but can be interrupted by fatal
* signals. It returns 0 if it locked the page and -EINTR if it was
@@ -700,10 +708,7 @@ static inline void lock_page(struct page *page)
*/
static inline int lock_page_killable(struct page *page)
{
- might_sleep();
- if (!trylock_page(page))
- return __lock_page_killable(page);
- return 0;
+ return folio_lock_killable(page_folio(page));
}
/*
diff --git a/mm/filemap.c b/mm/filemap.c
index a89227132141..70dc1798f6d6 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1589,14 +1589,13 @@ void __folio_lock(struct folio *folio)
}
EXPORT_SYMBOL(__folio_lock);
-int __lock_page_killable(struct page *__page)
+int __folio_lock_killable(struct folio *folio)
{
- struct page *page = compound_head(__page);
- wait_queue_head_t *q = page_waitqueue(page);
- return wait_on_page_bit_common(q, page, PG_locked, TASK_KILLABLE,
+ wait_queue_head_t *q = page_waitqueue(&folio->page);
+ return wait_on_page_bit_common(q, &folio->page, PG_locked, TASK_KILLABLE,
EXCLUSIVE);
}
-EXPORT_SYMBOL_GPL(__lock_page_killable);
+EXPORT_SYMBOL_GPL(__folio_lock_killable);
int __lock_page_async(struct page *page, struct wait_page_queue *wait)
{
@@ -1638,6 +1637,8 @@ int __lock_page_async(struct page *page, struct wait_page_queue *wait)
int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
unsigned int flags)
{
+ struct folio *folio = page_folio(page);
+
if (fault_flag_allow_retry_first(flags)) {
/*
* CAUTION! In this case, mmap_lock is not released
@@ -1656,13 +1657,13 @@ int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
if (flags & FAULT_FLAG_KILLABLE) {
int ret;
- ret = __lock_page_killable(page);
+ ret = __folio_lock_killable(folio);
if (ret) {
mmap_read_unlock(mm);
return 0;
}
} else {
- __folio_lock(page_folio(page));
+ __folio_lock(folio);
}
return 1;
@@ -2851,7 +2852,7 @@ static int lock_page_maybe_drop_mmap(struct vm_fault *vmf, struct page *page,
*fpin = maybe_unlock_mmap_for_io(vmf, *fpin);
if (vmf->flags & FAULT_FLAG_KILLABLE) {
- if (__lock_page_killable(&folio->page)) {
+ if (__folio_lock_killable(folio)) {
/*
* We didn't have the right flags to drop the mmap_lock,
* but all fault_handlers only check for fatal signals
--
2.30.2
next prev parent reply other threads:[~2021-06-22 12:00 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-22 11:40 [PATCH v12 00/33] Memory folios Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 01/33] mm: Convert get_page_unless_zero() to return bool Matthew Wilcox (Oracle)
2021-06-23 7:46 ` Christoph Hellwig
2021-06-28 12:35 ` Kirill A. Shutemov
2021-06-22 11:40 ` [PATCH v12 02/33] mm: Introduce struct folio Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 03/33] mm: Add folio_pgdat(), folio_zone() and folio_zonenum() Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 04/33] mm/vmstat: Add functions to account folio statistics Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 05/33] mm/debug: Add VM_BUG_ON_FOLIO() and VM_WARN_ON_ONCE_FOLIO() Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 06/33] mm: Add folio reference count functions Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 07/33] mm: Add folio_put() Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 08/33] mm: Add folio_get() Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 09/33] mm: Add folio_try_get_rcu() Matthew Wilcox (Oracle)
2021-06-28 12:38 ` Kirill A. Shutemov
2021-06-22 11:40 ` [PATCH v12 10/33] mm: Add folio flag manipulation functions Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 11/33] mm/lru: Add folio LRU functions Matthew Wilcox (Oracle)
2021-06-28 12:40 ` Kirill A. Shutemov
2021-06-22 11:40 ` [PATCH v12 12/33] mm: Handle per-folio private data Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 13/33] mm/filemap: Add folio_index(), folio_file_page() and folio_contains() Matthew Wilcox (Oracle)
2021-06-22 11:40 ` [PATCH v12 14/33] mm/filemap: Add folio_next_index() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 15/33] mm/filemap: Add folio_pos() and folio_file_pos() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 16/33] mm/util: Add folio_mapping() and folio_file_mapping() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 17/33] mm/memcg: Add folio wrappers for various functions Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 18/33] mm/filemap: Add folio_unlock() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 19/33] mm/filemap: Add folio_lock() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` Matthew Wilcox (Oracle) [this message]
2021-06-22 11:41 ` [PATCH v12 21/33] mm/filemap: Add __folio_lock_async() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 22/33] mm/filemap: Add folio_wait_locked() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 23/33] mm/filemap: Add __folio_lock_or_retry() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 24/33] mm/swap: Add folio_rotate_reclaimable() Matthew Wilcox (Oracle)
2021-06-28 12:46 ` Kirill A. Shutemov
2021-06-22 11:41 ` [PATCH v12 25/33] mm/filemap: Add folio_end_writeback() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 26/33] mm/writeback: Add folio_wait_writeback() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 27/33] mm/writeback: Add folio_wait_stable() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 28/33] mm/filemap: Add folio_wait_bit() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 29/33] mm/filemap: Add folio_wake_bit() Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 30/33] mm/filemap: Convert page wait queues to be folios Matthew Wilcox (Oracle)
2021-06-22 11:41 ` [PATCH v12 31/33] mm/filemap: Add folio private_2 functions Matthew Wilcox (Oracle)
2021-06-28 12:47 ` Kirill A. Shutemov
2021-06-22 11:41 ` [PATCH v12 32/33] fs/netfs: Add folio fscache functions Matthew Wilcox (Oracle)
2021-06-28 12:49 ` Kirill A. Shutemov
2021-06-22 11:41 ` [PATCH v12 33/33] mm: Add folio_mapped() Matthew Wilcox (Oracle)
2021-06-28 12:51 ` Kirill A. Shutemov
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