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Date: Fri, 21 Dec 2018 14:53:14 +0200
From: Nikolay Borisov <nborisov@...e.com>
To: linux-mm@...ck.org, akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org, linux-afs@...ts.infradead.org,
linux-fsdevel@...r.kernel.org, Nikolay Borisov <nborisov@...e.com>
Subject: [PATCH] mm: Define VM_(MAX|MIN)_READAHEAD via sizes.h constants
All users of the aformentioned macros convert them to kbytes by
multplying. Instead, directly define the macros via the aptly named
SZ_16K/SZ_128K ones. Also remove the now redundant comments explaining
that VM_* are defined in kbytes it's obvious. No functional changes.
Signed-off-by: Nikolay Borisov <nborisov@...e.com>
---
I guess it makes sense for this to land via Andrew's mmotm tree?
block/blk-core.c | 3 +--
fs/9p/vfs_super.c | 2 +-
fs/afs/super.c | 2 +-
fs/btrfs/disk-io.c | 2 +-
fs/fuse/inode.c | 2 +-
include/linux/mm.h | 5 +++--
6 files changed, 8 insertions(+), 8 deletions(-)
diff --git a/block/blk-core.c b/block/blk-core.c
index deb56932f8c4..d28b2eeec07e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1031,8 +1031,7 @@ struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id,
if (!q->stats)
goto fail_stats;
- q->backing_dev_info->ra_pages =
- (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
+ q->backing_dev_info->ra_pages = VM_MAX_READAHEAD / PAGE_SIZE;
q->backing_dev_info->capabilities = BDI_CAP_CGROUP_WRITEBACK;
q->backing_dev_info->name = "block";
q->node = node_id;
diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 48ce50484e80..5c9f757410ae 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -92,7 +92,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,
return ret;
if (v9ses->cache)
- sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024)/PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_MAX_READAHEAD / PAGE_SIZE;
sb->s_flags |= SB_ACTIVE | SB_DIRSYNC;
if (!v9ses->cache)
diff --git a/fs/afs/super.c b/fs/afs/super.c
index dcd07fe99871..d1f3af74481a 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -399,7 +399,7 @@ static int afs_fill_super(struct super_block *sb,
ret = super_setup_bdi(sb);
if (ret)
return ret;
- sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_MAX_READAHEAD / PAGE_SIZE;
/* allocate the root inode and dentry */
if (as->dyn_root) {
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 6d776717d8b3..d84e7283d24b 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -2900,7 +2900,7 @@ int open_ctree(struct super_block *sb,
sb->s_bdi->congested_fn = btrfs_congested_fn;
sb->s_bdi->congested_data = fs_info;
sb->s_bdi->capabilities |= BDI_CAP_CGROUP_WRITEBACK;
- sb->s_bdi->ra_pages = VM_MAX_READAHEAD * SZ_1K / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_MAX_READAHEAD / PAGE_SIZE;
sb->s_bdi->ra_pages *= btrfs_super_num_devices(disk_super);
sb->s_bdi->ra_pages = max(sb->s_bdi->ra_pages, SZ_4M / PAGE_SIZE);
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 568abed20eb2..25766e9035b1 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -1009,7 +1009,7 @@ static int fuse_bdi_init(struct fuse_conn *fc, struct super_block *sb)
if (err)
return err;
- sb->s_bdi->ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_SIZE;
+ sb->s_bdi->ra_pages = VM_MAX_READAHEAD / PAGE_SIZE;
/* fuse does it's own writeback accounting */
sb->s_bdi->capabilities = BDI_CAP_NO_ACCT_WB | BDI_CAP_STRICTLIMIT;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5411de93a363..e2085eaceae9 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -26,6 +26,7 @@
#include <linux/page_ref.h>
#include <linux/memremap.h>
#include <linux/overflow.h>
+#include <linux/sizes.h>
struct mempolicy;
struct anon_vma;
@@ -2396,8 +2397,8 @@ int __must_check write_one_page(struct page *page);
void task_dirty_inc(struct task_struct *tsk);
/* readahead.c */
-#define VM_MAX_READAHEAD 128 /* kbytes */
-#define VM_MIN_READAHEAD 16 /* kbytes (includes current page) */
+#define VM_MAX_READAHEAD SZ_128K
+#define VM_MIN_READAHEAD SZ_16K /* includes current page */
int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
pgoff_t offset, unsigned long nr_to_read);
--
2.17.1
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