Since commit 03afc0e25f7f ("slab: get_online_mems for
kmem_cache_{create,destroy,shrink}") we are taking memory hotplug lock for SLAB
and SLUB when creating, destroying or shrinking a cache. It is quite a heavy
lock and it's best to avoid it if possible, as we had several issues with
lockdep complaining about ordering in the past, see e.g. e4f8e513c3d3
("mm/slub: fix a deadlock in show_slab_objects()").
The problem scenario in 03afc0e25f7f (solved by the memory hotplug lock) can be
summarized as follows: while there's slab_mutex synchronizing new kmem cache
creation and SLUB's MEM_GOING_ONLINE callback slab_mem_going_online_callback(),
we may miss creation of kmem_cache_node for the hotplugged node in the new kmem
cache, because the hotplug callback doesn't yet see the new cache, and cache
creation in init_kmem_cache_nodes() only inits kmem_cache_node for nodes in the
N_NORMAL_MEMORY nodemask, which however may not yet include the new node, as
that happens only later after the MEM_GOING_ONLINE callback.
Instead of using get/put_online_mems(), the problem can be solved by SLUB
maintaining its own nodemask of nodes for which it has allocated the per-node
kmem_cache_node structures. This nodemask would generally mirror the
N_NORMAL_MEMORY nodemask, but would be updated only in under SLUB's control in
its memory hotplug callbacks under the slab_mutex. This patch adds such
nodemask and its handling.
Commit 03afc0e25f7f mentiones "issues like [the one above]", but there don't
appear to be further issues. All the paths (shared for SLAB and SLUB) taking
the memory hotplug locks are also taking the slab_mutex, except
kmem_cache_shrink() where 03afc0e25f7f replaced slab_mutex with
get/put_online_mems().
We however cannot simply restore slab_mutex in kmem_cache_shrink(), as SLUB can
enters the function from a write to sysfs 'shrink' file, thus holding kernfs
lock, and in kmem_cache_create() the kernfs lock is nested within slab_mutex.
But on closer inspection we don't actually need to protect kmem_cache_shrink()
from hotplug callbacks: While SLUB's __kmem_cache_shrink() does
for_each_kmem_cache_node(), missing a new node added in parallel hotplug is not
fatal, and parallel hotremove does not free kmem_cache_node's anymore after the
previous patch, so use-after free cannot happen. The per-node shrinking itself
is protected by n->list_lock. Same is true for SLAB, and SLOB is no-op.
SLAB also doesn't need the memory hotplug locking, which it only gained by
03afc0e25f7f through the shared paths in slab_common.c. Its memory hotplug
callbacks are also protected by slab_mutex against races with these paths. The
problem of SLUB relying on N_NORMAL_MEMORY doesn't apply to SLAB, as its
setup_kmem_cache_nodes relies on N_ONLINE, and the new node is already set
there during the MEM_GOING_ONLINE callback, so no special care is needed
for SLAB.
As such, this patch removes all get/put_online_mems() usage by the slab
subsystem.
Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx>
---
mm/slab_common.c | 8 ++------
mm/slub.c | 28 +++++++++++++++++++++++++---
2 files changed, 27 insertions(+), 9 deletions(-)
diff --git a/mm/slab_common.c b/mm/slab_common.c
index d5986ebb84ea..e040b3820a75 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -311,7 +311,6 @@ kmem_cache_create_usercopy(const char *name,
int err;
get_online_cpus();
- get_online_mems();
mutex_lock(&slab_mutex);
@@ -361,7 +360,6 @@ kmem_cache_create_usercopy(const char *name,
out_unlock:
mutex_unlock(&slab_mutex);
- put_online_mems();
put_online_cpus();
if (err) {
@@ -490,7 +488,6 @@ void kmem_cache_destroy(struct kmem_cache *s)
return;
get_online_cpus();
- get_online_mems();
mutex_lock(&slab_mutex);
@@ -507,7 +504,6 @@ void kmem_cache_destroy(struct kmem_cache *s)
out_unlock:
mutex_unlock(&slab_mutex);
- put_online_mems();
put_online_cpus();
}
EXPORT_SYMBOL(kmem_cache_destroy);
@@ -526,10 +522,10 @@ int kmem_cache_shrink(struct kmem_cache *cachep)
int ret;
get_online_cpus();
- get_online_mems();
+
kasan_cache_shrink(cachep);
ret = __kmem_cache_shrink(cachep);
- put_online_mems();
+
put_online_cpus();
return ret;
}
diff --git a/mm/slub.c b/mm/slub.c
index 0d01a893cb64..0d4bdf6783ee 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -236,6 +236,14 @@ static inline void stat(const struct kmem_cache *s, enum stat_item si)
#endif
}
+/*
+ * Tracks for which NUMA nodes we have kmem_cache_nodes allocated.
+ * Corresponds to node_state[N_NORMAL_MEMORY], but can temporarily
+ * differ during memory hotplug/hotremove operations.
+ * Protected by slab_mutex.
+ */
+static nodemask_t slab_nodes;
+
/********************************************************************
* Core slab cache functions
*******************************************************************/
@@ -2678,7 +2686,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
* ignore the node constraint
*/
if (unlikely(node != NUMA_NO_NODE &&
- !node_state(node, N_NORMAL_MEMORY)))
+ !node_isset(node, slab_nodes)))
node = NUMA_NO_NODE;
goto new_slab;
}
@@ -2689,7 +2697,7 @@ static void *___slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
* same as above but node_match() being false already
* implies node != NUMA_NO_NODE
*/
- if (!node_state(node, N_NORMAL_MEMORY)) {
+ if (!node_isset(node, slab_nodes)) {
node = NUMA_NO_NODE;
goto redo;
} else {
@@ -3599,7 +3607,7 @@ static int init_kmem_cache_nodes(struct kmem_cache *s)
{
int node;
- for_each_node_state(node, N_NORMAL_MEMORY) {
+ for_each_node_mask(node, slab_nodes) {
struct kmem_cache_node *n;
if (slab_state == DOWN) {
@@ -4299,6 +4307,7 @@ static void slab_mem_offline_callback(void *arg)
return;
mutex_lock(&slab_mutex);
+ node_clear(offline_node, slab_nodes);
/*
* We no longer free kmem_cache_node structures here, as it would be
* racy with all get_node() users, and infeasible to protect them with
@@ -4348,6 +4357,11 @@ static int slab_mem_going_online_callback(void *arg)
init_kmem_cache_node(n);
s->node[nid] = n;
}
+ /*
+ * Any cache created after this point will also have kmem_cache_node
+ * initialized for the new node.
+ */
+ node_set(nid, slab_nodes);
out:
mutex_unlock(&slab_mutex);
return ret;
@@ -4428,6 +4442,7 @@ void __init kmem_cache_init(void)
{
static __initdata struct kmem_cache boot_kmem_cache,
boot_kmem_cache_node;
+ int node;
if (debug_guardpage_minorder())
slub_max_order = 0;
@@ -4435,6 +4450,13 @@ void __init kmem_cache_init(void)
kmem_cache_node = &boot_kmem_cache_node;
kmem_cache = &boot_kmem_cache;
+ /*
+ * Initialize the nodemask for which we will allocate per node
+ * structures. Here we don't need taking slab_mutex yet.
+ */
+ for_each_node_state(node, N_NORMAL_MEMORY)
+ node_set(node, slab_nodes);
+
create_boot_cache(kmem_cache_node, "kmem_cache_node",
sizeof(struct kmem_cache_node), SLAB_HWCACHE_ALIGN, 0, 0);
--
2.29.2
