From: Matthew Wilcox <willy@infradead.org>
To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH v2 16/25] iomap: Support large pages in read paths
Date: Tue, 11 Feb 2020 20:18:36 -0800 [thread overview]
Message-ID: <20200212041845.25879-17-willy@infradead.org> (raw)
In-Reply-To: <20200212041845.25879-1-willy@infradead.org>
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Use thp_size() instead of PAGE_SIZE, use offset_in_this_page() and
abstract away how to access the list of readahead pages.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/iomap/buffered-io.c | 28 ++++++++++++++++++++--------
1 file changed, 20 insertions(+), 8 deletions(-)
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index e522039f627f..68f8903ecd6d 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -179,14 +179,16 @@ iomap_read_finish(struct iomap_page *iop, struct page *page)
static void
iomap_read_page_end_io(struct bio_vec *bvec, int error)
{
- struct page *page = bvec->bv_page;
+ struct page *page = compound_head(bvec->bv_page);
struct iomap_page *iop = to_iomap_page(page);
+ unsigned offset = bvec->bv_offset +
+ PAGE_SIZE * (bvec->bv_page - page);
if (unlikely(error)) {
ClearPageUptodate(page);
SetPageError(page);
} else {
- iomap_set_range_uptodate(page, bvec->bv_offset, bvec->bv_len);
+ iomap_set_range_uptodate(page, offset, bvec->bv_len);
}
iomap_read_finish(iop, page);
@@ -239,6 +241,16 @@ static inline bool iomap_block_needs_zeroing(struct inode *inode,
pos >= i_size_read(inode);
}
+/*
+ * Estimate the number of vectors we need based on the current page size;
+ * if we're wrong we'll end up doing an overly large allocation or needing
+ * to do a second allocation, neither of which is a big deal.
+ */
+static unsigned int iomap_nr_vecs(struct page *page, loff_t length)
+{
+ return (length + thp_size(page) - 1) >> page_shift(page);
+}
+
static loff_t
iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
struct iomap *iomap, struct iomap *srcmap)
@@ -263,7 +275,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
goto done;
if (iomap_block_needs_zeroing(inode, iomap, pos)) {
- zero_user(page, poff, plen);
+ zero_user_large(page, poff, plen);
iomap_set_range_uptodate(page, poff, plen);
goto done;
}
@@ -294,7 +306,7 @@ iomap_readpage_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
if (!ctx->bio || !is_contig || bio_full(ctx->bio, plen)) {
gfp_t gfp = mapping_gfp_constraint(page->mapping, GFP_KERNEL);
- int nr_vecs = (length + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ int nr_vecs = iomap_nr_vecs(page, length);
if (ctx->bio)
submit_bio(ctx->bio);
@@ -331,9 +343,9 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops)
trace_iomap_readpage(page->mapping->host, 1);
- for (poff = 0; poff < PAGE_SIZE; poff += ret) {
- ret = iomap_apply(inode, page_offset(page) + poff,
- PAGE_SIZE - poff, 0, ops, &ctx,
+ for (poff = 0; poff < thp_size(page); poff += ret) {
+ ret = iomap_apply(inode, file_offset_of_page(page) + poff,
+ thp_size(page) - poff, 0, ops, &ctx,
iomap_readpage_actor);
if (ret <= 0) {
WARN_ON_ONCE(ret == 0);
@@ -376,7 +388,7 @@ iomap_readahead_actor(struct inode *inode, loff_t pos, loff_t length,
if (WARN_ON(ret == 0))
break;
done += ret;
- if (offset_in_page(pos + done) == 0) {
+ if (offset_in_this_page(ctx->cur_page, pos + done) == 0) {
ctx->rac->nr_pages -= ctx->rac->batch_count;
if (!ctx->cur_page_in_bio)
unlock_page(ctx->cur_page);
--
2.25.0
next prev parent reply other threads:[~2020-02-12 4:19 UTC|newest]
Thread overview: 68+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-12 4:18 [PATCH v2 00/25] Large pages in the page cache Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 01/25] mm: Use vm_fault error code directly Matthew Wilcox
2020-02-12 7:34 ` Christoph Hellwig
2020-02-12 4:18 ` [PATCH v2 02/25] mm: Optimise find_subpage for !THP Matthew Wilcox
2020-02-12 7:41 ` Christoph Hellwig
2020-02-12 13:02 ` Matthew Wilcox
2020-02-12 17:52 ` Christoph Hellwig
2020-02-13 13:50 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 03/25] mm: Use VM_BUG_ON_PAGE in clear_page_dirty_for_io Matthew Wilcox
2020-02-12 7:38 ` Christoph Hellwig
2020-02-13 13:50 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 04/25] mm: Unexport find_get_entry Matthew Wilcox
2020-02-12 7:37 ` Christoph Hellwig
2020-02-13 13:51 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 05/25] mm: Fix documentation of FGP flags Matthew Wilcox
2020-02-12 7:42 ` Christoph Hellwig
2020-02-12 19:11 ` Matthew Wilcox
2020-02-13 14:00 ` Kirill A. Shutemov
2020-02-13 13:59 ` Kirill A. Shutemov
2020-02-13 14:34 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 06/25] mm: Allow hpages to be arbitrary order Matthew Wilcox
2020-02-13 14:11 ` Kirill A. Shutemov
2020-02-13 14:30 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 07/25] mm: Introduce thp_size Matthew Wilcox
2020-02-13 14:19 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 08/25] mm: Introduce thp_order Matthew Wilcox
2020-02-13 14:20 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 09/25] fs: Add a filesystem flag for large pages Matthew Wilcox
2020-02-12 7:43 ` Christoph Hellwig
2020-02-12 14:59 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 10/25] fs: Introduce i_blocks_per_page Matthew Wilcox
2020-02-12 7:44 ` Christoph Hellwig
2020-02-12 15:05 ` Matthew Wilcox
2020-02-12 17:54 ` Christoph Hellwig
2020-02-13 15:40 ` Kirill A. Shutemov
2020-02-13 16:07 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 11/25] fs: Make page_mkwrite_check_truncate thp-aware Matthew Wilcox
2020-02-13 15:44 ` Kirill A. Shutemov
2020-02-13 16:26 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 12/25] mm: Add file_offset_of_ helpers Matthew Wilcox
2020-02-12 7:46 ` Christoph Hellwig
2020-02-12 4:18 ` [PATCH v2 13/25] fs: Add zero_user_large Matthew Wilcox
2020-02-14 13:52 ` Kirill A. Shutemov
2020-02-14 16:03 ` Matthew Wilcox
2020-02-18 14:16 ` Kirill A. Shutemov
2020-02-18 16:13 ` Matthew Wilcox
2020-02-18 17:10 ` Kirill A. Shutemov
2020-02-18 18:07 ` Matthew Wilcox
2020-02-21 12:42 ` Kirill A. Shutemov
2020-02-12 4:18 ` [PATCH v2 14/25] iomap: Support arbitrarily many blocks per page Matthew Wilcox
2020-02-12 8:05 ` Christoph Hellwig
2020-02-12 4:18 ` [PATCH v2 15/25] iomap: Support large pages in iomap_adjust_read_range Matthew Wilcox
2020-02-12 8:11 ` Christoph Hellwig
2020-02-12 4:18 ` Matthew Wilcox [this message]
2020-02-12 8:13 ` [PATCH v2 16/25] iomap: Support large pages in read paths Christoph Hellwig
2020-02-12 17:45 ` Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 17/25] iomap: Support large pages in write paths Matthew Wilcox
2020-02-12 8:17 ` Christoph Hellwig
2020-02-12 4:18 ` [PATCH v2 18/25] iomap: Inline data shouldn't see large pages Matthew Wilcox
2020-02-12 8:05 ` Christoph Hellwig
2020-02-12 4:18 ` [PATCH v2 19/25] xfs: Support " Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 20/25] mm: Make prep_transhuge_page return its argument Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 21/25] mm: Add __page_cache_alloc_order Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 22/25] mm: Allow large pages to be added to the page cache Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 23/25] mm: Allow large pages to be removed from " Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 24/25] mm: Add large page readahead Matthew Wilcox
2020-02-12 4:18 ` [PATCH v2 25/25] mm: Align THP mappings for non-DAX Matthew Wilcox
2020-02-12 7:50 ` Christoph Hellwig
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