We are going to make the FS shrinker memcg-aware. To achieve that, we
will have to pass the memcg to scan to the nr_cached_objects and
free_cached_objects VFS methods, which currently take only the NUMA node
to scan. Since the shrink_control structure already holds the node, and
the memcg to scan will be added to it as we introduce memcg-aware
vmscan, let us consolidate the methods' arguments in this structure to
keep things clean.
Thanks to David Chinner for the tip.
Signed-off-by: Vladimir Davydov <vdavydov@xxxxxxxxxxxxx>
Cc: Glauber Costa <glommer@xxxxxxxxxx>
Cc: Dave Chinner <dchinner@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
---
fs/super.c | 8 +++-----
fs/xfs/xfs_super.c | 6 +++---
include/linux/fs.h | 6 ++++--
3 files changed, 10 insertions(+), 10 deletions(-)
diff --git a/fs/super.c b/fs/super.c
index a039dba..8f9a81b 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -76,7 +76,7 @@ static unsigned long super_cache_scan(struct shrinker *shrink,
return SHRINK_STOP;
if (sb->s_op->nr_cached_objects)
- fs_objects = sb->s_op->nr_cached_objects(sb, sc->nid);
+ fs_objects = sb->s_op->nr_cached_objects(sb, sc);
inodes = list_lru_count(&sb->s_inode_lru, sc);
dentries = list_lru_count(&sb->s_dentry_lru, sc);
@@ -96,8 +96,7 @@ static unsigned long super_cache_scan(struct shrinker *shrink,
if (fs_objects) {
fs_objects = mult_frac(sc->nr_to_scan, fs_objects,
total_objects);
- freed += sb->s_op->free_cached_objects(sb, fs_objects,
- sc->nid);
+ freed += sb->s_op->free_cached_objects(sb, sc, fs_objects);
}
drop_super(sb);
@@ -116,8 +115,7 @@ static unsigned long super_cache_count(struct shrinker *shrink,
return 0;
if (sb->s_op && sb->s_op->nr_cached_objects)
- total_objects = sb->s_op->nr_cached_objects(sb,
- sc->nid);
+ total_objects = sb->s_op->nr_cached_objects(sb, sc);
total_objects += list_lru_count(&sb->s_dentry_lru, sc);
total_objects += list_lru_count(&sb->s_inode_lru, sc);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index f317488..06d155d 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1524,7 +1524,7 @@ xfs_fs_mount(
static long
xfs_fs_nr_cached_objects(
struct super_block *sb,
- int nid)
+ struct shrink_control *sc)
{
return xfs_reclaim_inodes_count(XFS_M(sb));
}
@@ -1532,8 +1532,8 @@ xfs_fs_nr_cached_objects(
static long
xfs_fs_free_cached_objects(
struct super_block *sb,
- long nr_to_scan,
- int nid)
+ struct shrink_control *sc,
+ long nr_to_scan)
{
return xfs_reclaim_inodes_nr(XFS_M(sb), nr_to_scan);
}
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 121f11f..b367d54 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1619,8 +1619,10 @@ struct super_operations {
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
#endif
int (*bdev_try_to_free_page)(struct super_block*, struct page*, gfp_t);
- long (*nr_cached_objects)(struct super_block *, int);
- long (*free_cached_objects)(struct super_block *, long, int);
+ long (*nr_cached_objects)(struct super_block *,
+ struct shrink_control *);
+ long (*free_cached_objects)(struct super_block *,
+ struct shrink_control *, long);
};
/*
--
1.7.10.4
--
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