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Date: Wed, 21 Jun 2023 10:38:21 +0200
From: Pankaj Raghav <p.raghav@...sung.com>
To: <hare@...e.de>, <willy@...radead.org>, <david@...morbit.com>
CC: <gost.dev@...sung.com>, <mcgrof@...nel.org>, <hch@....de>,
<jwong@...nel.org>, <linux-fsdevel@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
Pankaj Raghav <p.raghav@...sung.com>
Subject: [RFC 2/4] filemap: use minimum order while allocating folios
Add support to filemap and readahead to use the folio order set by
mapping_min_folio_order().
Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>
---
mm/filemap.c | 9 ++++++---
mm/readahead.c | 34 ++++++++++++++++++++++++----------
2 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/mm/filemap.c b/mm/filemap.c
index 3b73101f9f86..9dc8568e9336 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1936,7 +1936,8 @@ struct folio *__filemap_get_folio(struct address_space *mapping, pgoff_t index,
gfp |= GFP_NOWAIT | __GFP_NOWARN;
}
- folio = filemap_alloc_folio(gfp, 0);
+ folio = filemap_alloc_folio(gfp,
+ mapping_min_folio_order(mapping));
if (!folio)
return ERR_PTR(-ENOMEM);
@@ -2495,7 +2496,8 @@ static int filemap_create_folio(struct file *file,
struct folio *folio;
int error;
- folio = filemap_alloc_folio(mapping_gfp_mask(mapping), 0);
+ folio = filemap_alloc_folio(mapping_gfp_mask(mapping),
+ mapping_min_folio_order(mapping));
if (!folio)
return -ENOMEM;
@@ -3663,7 +3665,8 @@ static struct folio *do_read_cache_folio(struct address_space *mapping,
repeat:
folio = filemap_get_folio(mapping, index);
if (IS_ERR(folio)) {
- folio = filemap_alloc_folio(gfp, 0);
+ folio = filemap_alloc_folio(gfp,
+ mapping_min_folio_order(mapping));
if (!folio)
return ERR_PTR(-ENOMEM);
err = filemap_add_folio(mapping, folio, index, gfp);
diff --git a/mm/readahead.c b/mm/readahead.c
index 47afbca1d122..090b810ddeed 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -245,7 +245,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
continue;
}
- folio = filemap_alloc_folio(gfp_mask, 0);
+ folio = filemap_alloc_folio(gfp_mask,
+ mapping_min_folio_order(mapping));
if (!folio)
break;
if (filemap_add_folio(mapping, folio, index + i,
@@ -259,7 +260,8 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
if (i == nr_to_read - lookahead_size)
folio_set_readahead(folio);
ractl->_workingset |= folio_test_workingset(folio);
- ractl->_nr_pages++;
+ ractl->_nr_pages += folio_nr_pages(folio);
+ i += folio_nr_pages(folio) - 1;
}
/*
@@ -311,6 +313,8 @@ void force_page_cache_ra(struct readahead_control *ractl,
struct file_ra_state *ra = ractl->ra;
struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
unsigned long max_pages, index;
+ unsigned int folio_order = mapping_min_folio_order(mapping);
+ unsigned int nr_of_pages = (1 << folio_order);
if (unlikely(!mapping->a_ops->read_folio && !mapping->a_ops->readahead))
return;
@@ -320,6 +324,13 @@ void force_page_cache_ra(struct readahead_control *ractl,
* be up to the optimal hardware IO size
*/
index = readahead_index(ractl);
+ if (folio_order && (index & (nr_of_pages - 1))) {
+ unsigned long old_index = index;
+
+ index = round_down(index, nr_of_pages);
+ nr_to_read += (old_index - index);
+ }
+
max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);
nr_to_read = min_t(unsigned long, nr_to_read, max_pages);
while (nr_to_read) {
@@ -795,18 +806,20 @@ void readahead_expand(struct readahead_control *ractl,
struct file_ra_state *ra = ractl->ra;
pgoff_t new_index, new_nr_pages;
gfp_t gfp_mask = readahead_gfp_mask(mapping);
+ unsigned min_folio_count = 1U << mapping_min_folio_order(mapping);
- new_index = new_start / PAGE_SIZE;
+ new_index = new_start / (min_folio_count * PAGE_SIZE);
/* Expand the leading edge downwards */
while (ractl->_index > new_index) {
- unsigned long index = ractl->_index - 1;
+ unsigned long index = ractl->_index - min_folio_count;
struct folio *folio = xa_load(&mapping->i_pages, index);
if (folio && !xa_is_value(folio))
return; /* Folio apparently present */
- folio = filemap_alloc_folio(gfp_mask, 0);
+ folio = filemap_alloc_folio(gfp_mask,
+ mapping_min_folio_order(mapping));
if (!folio)
return;
if (filemap_add_folio(mapping, folio, index, gfp_mask) < 0) {
@@ -818,7 +831,7 @@ void readahead_expand(struct readahead_control *ractl,
ractl->_workingset = true;
psi_memstall_enter(&ractl->_pflags);
}
- ractl->_nr_pages++;
+ ractl->_nr_pages += folio_nr_pages(folio);
ractl->_index = folio->index;
}
@@ -833,7 +846,8 @@ void readahead_expand(struct readahead_control *ractl,
if (folio && !xa_is_value(folio))
return; /* Folio apparently present */
- folio = filemap_alloc_folio(gfp_mask, 0);
+ folio = filemap_alloc_folio(gfp_mask,
+ mapping_min_folio_order(mapping));
if (!folio)
return;
if (filemap_add_folio(mapping, folio, index, gfp_mask) < 0) {
@@ -845,10 +859,10 @@ void readahead_expand(struct readahead_control *ractl,
ractl->_workingset = true;
psi_memstall_enter(&ractl->_pflags);
}
- ractl->_nr_pages++;
+ ractl->_nr_pages += folio_nr_pages(folio);
if (ra) {
- ra->size++;
- ra->async_size++;
+ ra->size += folio_nr_pages(folio);
+ ra->async_size += folio_nr_pages(folio);
}
}
}
--
2.39.2
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