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Date: Tue, 5 Dec 2017 16:41:58 -0800
From: Matthew Wilcox <willy@...radead.org>
To: unlisted-recipients:; (no To-header on input)
Cc: Matthew Wilcox <mawilcox@...rosoft.com>,
Ross Zwisler <ross.zwisler@...ux.intel.com>,
Jens Axboe <axboe@...nel.dk>,
Rehas Sachdeva <aquannie@...il.com>, linux-mm@...ck.org,
linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net,
linux-nilfs@...r.kernel.org, linux-btrfs@...r.kernel.org,
linux-xfs@...r.kernel.org, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v4 72/73] xfs: Convert mru cache to XArray
From: Matthew Wilcox <mawilcox@...rosoft.com>
This eliminates a call to radix_tree_preload().
Signed-off-by: Matthew Wilcox <mawilcox@...rosoft.com>
---
fs/xfs/xfs_mru_cache.c | 72 +++++++++++++++++++++++---------------------------
1 file changed, 33 insertions(+), 39 deletions(-)
diff --git a/fs/xfs/xfs_mru_cache.c b/fs/xfs/xfs_mru_cache.c
index f8a674d7f092..2179bede5396 100644
--- a/fs/xfs/xfs_mru_cache.c
+++ b/fs/xfs/xfs_mru_cache.c
@@ -101,10 +101,9 @@
* an infinite loop in the code.
*/
struct xfs_mru_cache {
- struct radix_tree_root store; /* Core storage data structure. */
+ struct xarray store; /* Core storage data structure. */
struct list_head *lists; /* Array of lists, one per grp. */
struct list_head reap_list; /* Elements overdue for reaping. */
- spinlock_t lock; /* Lock to protect this struct. */
unsigned int grp_count; /* Number of discrete groups. */
unsigned int grp_time; /* Time period spanned by grps. */
unsigned int lru_grp; /* Group containing time zero. */
@@ -232,22 +231,21 @@ _xfs_mru_cache_list_insert(
* data store, removing it from the reap list, calling the client's free
* function and deleting the element from the element zone.
*
- * We get called holding the mru->lock, which we drop and then reacquire.
- * Sparse need special help with this to tell it we know what we are doing.
+ * We get called holding the mru->store lock, which we drop and then reacquire.
+ * Sparse needs special help with this to tell it we know what we are doing.
*/
STATIC void
_xfs_mru_cache_clear_reap_list(
struct xfs_mru_cache *mru)
- __releases(mru->lock) __acquires(mru->lock)
+ __releases(mru->store) __acquires(mru->store)
{
struct xfs_mru_cache_elem *elem, *next;
struct list_head tmp;
INIT_LIST_HEAD(&tmp);
list_for_each_entry_safe(elem, next, &mru->reap_list, list_node) {
-
/* Remove the element from the data store. */
- radix_tree_delete(&mru->store, elem->key);
+ __xa_erase(&mru->store, elem->key);
/*
* remove to temp list so it can be freed without
@@ -255,14 +253,14 @@ _xfs_mru_cache_clear_reap_list(
*/
list_move(&elem->list_node, &tmp);
}
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
list_for_each_entry_safe(elem, next, &tmp, list_node) {
list_del_init(&elem->list_node);
mru->free_func(elem);
}
- spin_lock(&mru->lock);
+ xa_lock(&mru->store);
}
/*
@@ -284,7 +282,7 @@ _xfs_mru_cache_reap(
if (!mru || !mru->lists)
return;
- spin_lock(&mru->lock);
+ xa_lock(&mru->store);
next = _xfs_mru_cache_migrate(mru, jiffies);
_xfs_mru_cache_clear_reap_list(mru);
@@ -298,7 +296,7 @@ _xfs_mru_cache_reap(
queue_delayed_work(xfs_mru_reap_wq, &mru->work, next);
}
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
}
int
@@ -358,13 +356,8 @@ xfs_mru_cache_create(
for (grp = 0; grp < mru->grp_count; grp++)
INIT_LIST_HEAD(mru->lists + grp);
- /*
- * We use GFP_KERNEL radix tree preload and do inserts under a
- * spinlock so GFP_ATOMIC is appropriate for the radix tree itself.
- */
- INIT_RADIX_TREE(&mru->store, GFP_ATOMIC);
+ xa_init(&mru->store);
INIT_LIST_HEAD(&mru->reap_list);
- spin_lock_init(&mru->lock);
INIT_DELAYED_WORK(&mru->work, _xfs_mru_cache_reap);
mru->grp_time = grp_time;
@@ -394,17 +387,17 @@ xfs_mru_cache_flush(
if (!mru || !mru->lists)
return;
- spin_lock(&mru->lock);
+ xa_lock(&mru->store);
if (mru->queued) {
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
cancel_delayed_work_sync(&mru->work);
- spin_lock(&mru->lock);
+ xa_lock(&mru->store);
}
_xfs_mru_cache_migrate(mru, jiffies + mru->grp_count * mru->grp_time);
_xfs_mru_cache_clear_reap_list(mru);
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
}
void
@@ -431,24 +424,24 @@ xfs_mru_cache_insert(
unsigned long key,
struct xfs_mru_cache_elem *elem)
{
+ XA_STATE(xas, &mru->store, key);
int error;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
return -EINVAL;
- if (radix_tree_preload(GFP_NOFS))
- return -ENOMEM;
-
INIT_LIST_HEAD(&elem->list_node);
elem->key = key;
- spin_lock(&mru->lock);
- error = radix_tree_insert(&mru->store, key, elem);
- radix_tree_preload_end();
- if (!error)
- _xfs_mru_cache_list_insert(mru, elem);
- spin_unlock(&mru->lock);
+ do {
+ xas_lock(&xas);
+ xas_store(&xas, elem);
+ error = xas_error(&xas);
+ if (!error)
+ _xfs_mru_cache_list_insert(mru, elem);
+ xas_unlock(&xas);
+ } while (xas_nomem(&xas, GFP_NOFS));
return error;
}
@@ -470,11 +463,11 @@ xfs_mru_cache_remove(
if (!mru || !mru->lists)
return NULL;
- spin_lock(&mru->lock);
- elem = radix_tree_delete(&mru->store, key);
+ xa_lock(&mru->store);
+ elem = __xa_erase(&mru->store, key);
if (elem)
list_del(&elem->list_node);
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
return elem;
}
@@ -520,20 +513,21 @@ xfs_mru_cache_lookup(
struct xfs_mru_cache *mru,
unsigned long key)
{
+ XA_STATE(xas, &mru->store, key);
struct xfs_mru_cache_elem *elem;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
return NULL;
- spin_lock(&mru->lock);
- elem = radix_tree_lookup(&mru->store, key);
+ xas_lock(&xas);
+ elem = xas_load(&xas);
if (elem) {
list_del(&elem->list_node);
_xfs_mru_cache_list_insert(mru, elem);
- __release(mru_lock); /* help sparse not be stupid */
+ __release(&xas); /* help sparse not be stupid */
} else
- spin_unlock(&mru->lock);
+ xas_unlock(&xas);
return elem;
}
@@ -546,7 +540,7 @@ xfs_mru_cache_lookup(
void
xfs_mru_cache_done(
struct xfs_mru_cache *mru)
- __releases(mru->lock)
+ __releases(mru->store)
{
- spin_unlock(&mru->lock);
+ xa_unlock(&mru->store);
}
--
2.15.0
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