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authorLinus Torvalds <torvalds@linux-foundation.org>2018-06-04 16:58:06 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-04 16:58:06 +0200
commitf459c34538f57661e0fd1d3eaf7c0b17125ae011 (patch)
tree3addc82d7f792c4533501978798dad0095293933 /mm
parentLinux 4.17 (diff)
parentblk-mq: update nr_requests when switching to 'none' scheduler (diff)
downloadlinux-f459c34538f57661e0fd1d3eaf7c0b17125ae011.tar.xz
linux-f459c34538f57661e0fd1d3eaf7c0b17125ae011.zip
Merge tag 'for-4.18/block-20180603' of git://git.kernel.dk/linux-block
Pull block updates from Jens Axboe: - clean up how we pass around gfp_t and blk_mq_req_flags_t (Christoph) - prepare us to defer scheduler attach (Christoph) - clean up drivers handling of bounce buffers (Christoph) - fix timeout handling corner cases (Christoph/Bart/Keith) - bcache fixes (Coly) - prep work for bcachefs and some block layer optimizations (Kent). - convert users of bio_sets to using embedded structs (Kent). - fixes for the BFQ io scheduler (Paolo/Davide/Filippo) - lightnvm fixes and improvements (Matias, with contributions from Hans and Javier) - adding discard throttling to blk-wbt (me) - sbitmap blk-mq-tag handling (me/Omar/Ming). - remove the sparc jsflash block driver, acked by DaveM. - Kyber scheduler improvement from Jianchao, making it more friendly wrt merging. - conversion of symbolic proc permissions to octal, from Joe Perches. Previously the block parts were a mix of both. - nbd fixes (Josef and Kevin Vigor) - unify how we handle the various kinds of timestamps that the block core and utility code uses (Omar) - three NVMe pull requests from Keith and Christoph, bringing AEN to feature completeness, file backed namespaces, cq/sq lock split, and various fixes - various little fixes and improvements all over the map * tag 'for-4.18/block-20180603' of git://git.kernel.dk/linux-block: (196 commits) blk-mq: update nr_requests when switching to 'none' scheduler block: don't use blocking queue entered for recursive bio submits dm-crypt: fix warning in shutdown path lightnvm: pblk: take bitmap alloc. out of critical section lightnvm: pblk: kick writer on new flush points lightnvm: pblk: only try to recover lines with written smeta lightnvm: pblk: remove unnecessary bio_get/put lightnvm: pblk: add possibility to set write buffer size manually lightnvm: fix partial read error path lightnvm: proper error handling for pblk_bio_add_pages lightnvm: pblk: fix smeta write error path lightnvm: pblk: garbage collect lines with failed writes lightnvm: pblk: rework write error recovery path lightnvm: pblk: remove dead function lightnvm: pass flag on graceful teardown to targets lightnvm: pblk: check for chunk size before allocating it lightnvm: pblk: remove unnecessary argument lightnvm: pblk: remove unnecessary indirection lightnvm: pblk: return NVM_ error on failed submission lightnvm: pblk: warn in case of corrupted write buffer ...
Diffstat (limited to 'mm')
-rw-r--r--mm/backing-dev.c18
-rw-r--r--mm/mempool.c108
2 files changed, 98 insertions, 28 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 7441bd93b732..8fe3ebd6ac00 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -412,6 +412,7 @@ static void wb_exit(struct bdi_writeback *wb)
* protected.
*/
static DEFINE_SPINLOCK(cgwb_lock);
+static struct workqueue_struct *cgwb_release_wq;
/**
* wb_congested_get_create - get or create a wb_congested
@@ -522,7 +523,7 @@ static void cgwb_release(struct percpu_ref *refcnt)
{
struct bdi_writeback *wb = container_of(refcnt, struct bdi_writeback,
refcnt);
- schedule_work(&wb->release_work);
+ queue_work(cgwb_release_wq, &wb->release_work);
}
static void cgwb_kill(struct bdi_writeback *wb)
@@ -784,6 +785,21 @@ static void cgwb_bdi_register(struct backing_dev_info *bdi)
spin_unlock_irq(&cgwb_lock);
}
+static int __init cgwb_init(void)
+{
+ /*
+ * There can be many concurrent release work items overwhelming
+ * system_wq. Put them in a separate wq and limit concurrency.
+ * There's no point in executing many of these in parallel.
+ */
+ cgwb_release_wq = alloc_workqueue("cgwb_release", 0, 1);
+ if (!cgwb_release_wq)
+ return -ENOMEM;
+
+ return 0;
+}
+subsys_initcall(cgwb_init);
+
#else /* CONFIG_CGROUP_WRITEBACK */
static int cgwb_bdi_init(struct backing_dev_info *bdi)
diff --git a/mm/mempool.c b/mm/mempool.c
index 5c9dce34719b..b54f2c20e5e0 100644
--- a/mm/mempool.c
+++ b/mm/mempool.c
@@ -138,6 +138,28 @@ static void *remove_element(mempool_t *pool, gfp_t flags)
}
/**
+ * mempool_exit - exit a mempool initialized with mempool_init()
+ * @pool: pointer to the memory pool which was initialized with
+ * mempool_init().
+ *
+ * Free all reserved elements in @pool and @pool itself. This function
+ * only sleeps if the free_fn() function sleeps.
+ *
+ * May be called on a zeroed but uninitialized mempool (i.e. allocated with
+ * kzalloc()).
+ */
+void mempool_exit(mempool_t *pool)
+{
+ while (pool->curr_nr) {
+ void *element = remove_element(pool, GFP_KERNEL);
+ pool->free(element, pool->pool_data);
+ }
+ kfree(pool->elements);
+ pool->elements = NULL;
+}
+EXPORT_SYMBOL(mempool_exit);
+
+/**
* mempool_destroy - deallocate a memory pool
* @pool: pointer to the memory pool which was allocated via
* mempool_create().
@@ -150,15 +172,65 @@ void mempool_destroy(mempool_t *pool)
if (unlikely(!pool))
return;
- while (pool->curr_nr) {
- void *element = remove_element(pool, GFP_KERNEL);
- pool->free(element, pool->pool_data);
- }
- kfree(pool->elements);
+ mempool_exit(pool);
kfree(pool);
}
EXPORT_SYMBOL(mempool_destroy);
+int mempool_init_node(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+ mempool_free_t *free_fn, void *pool_data,
+ gfp_t gfp_mask, int node_id)
+{
+ spin_lock_init(&pool->lock);
+ pool->min_nr = min_nr;
+ pool->pool_data = pool_data;
+ pool->alloc = alloc_fn;
+ pool->free = free_fn;
+ init_waitqueue_head(&pool->wait);
+
+ pool->elements = kmalloc_array_node(min_nr, sizeof(void *),
+ gfp_mask, node_id);
+ if (!pool->elements)
+ return -ENOMEM;
+
+ /*
+ * First pre-allocate the guaranteed number of buffers.
+ */
+ while (pool->curr_nr < pool->min_nr) {
+ void *element;
+
+ element = pool->alloc(gfp_mask, pool->pool_data);
+ if (unlikely(!element)) {
+ mempool_exit(pool);
+ return -ENOMEM;
+ }
+ add_element(pool, element);
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL(mempool_init_node);
+
+/**
+ * mempool_init - initialize a memory pool
+ * @min_nr: the minimum number of elements guaranteed to be
+ * allocated for this pool.
+ * @alloc_fn: user-defined element-allocation function.
+ * @free_fn: user-defined element-freeing function.
+ * @pool_data: optional private data available to the user-defined functions.
+ *
+ * Like mempool_create(), but initializes the pool in (i.e. embedded in another
+ * structure).
+ */
+int mempool_init(mempool_t *pool, int min_nr, mempool_alloc_t *alloc_fn,
+ mempool_free_t *free_fn, void *pool_data)
+{
+ return mempool_init_node(pool, min_nr, alloc_fn, free_fn,
+ pool_data, GFP_KERNEL, NUMA_NO_NODE);
+
+}
+EXPORT_SYMBOL(mempool_init);
+
/**
* mempool_create - create a memory pool
* @min_nr: the minimum number of elements guaranteed to be
@@ -186,35 +258,17 @@ mempool_t *mempool_create_node(int min_nr, mempool_alloc_t *alloc_fn,
gfp_t gfp_mask, int node_id)
{
mempool_t *pool;
+
pool = kzalloc_node(sizeof(*pool), gfp_mask, node_id);
if (!pool)
return NULL;
- pool->elements = kmalloc_array_node(min_nr, sizeof(void *),
- gfp_mask, node_id);
- if (!pool->elements) {
+
+ if (mempool_init_node(pool, min_nr, alloc_fn, free_fn, pool_data,
+ gfp_mask, node_id)) {
kfree(pool);
return NULL;
}
- spin_lock_init(&pool->lock);
- pool->min_nr = min_nr;
- pool->pool_data = pool_data;
- init_waitqueue_head(&pool->wait);
- pool->alloc = alloc_fn;
- pool->free = free_fn;
- /*
- * First pre-allocate the guaranteed number of buffers.
- */
- while (pool->curr_nr < pool->min_nr) {
- void *element;
-
- element = pool->alloc(gfp_mask, pool->pool_data);
- if (unlikely(!element)) {
- mempool_destroy(pool);
- return NULL;
- }
- add_element(pool, element);
- }
return pool;
}
EXPORT_SYMBOL(mempool_create_node);