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ceph: move sb->wb_pagevec_pool to be a global mempool

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When doing some testing recently, I hit some page allocation failures
on mount, when creating the wb_pagevec_pool for the mount. That
requires 128k (32 contiguous pages), and after thrashing the memory
during an xfstests run, sometimes that would fail.

128k for each mount seems like a lot to hold in reserve for a rainy
day, so let's change this to a global mempool that gets allocated
when the module is plugged in.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
2020-07-30 11:03:55 -04:00
committed by Ilya Dryomov
parent b748fc7a87
commit a0102bda5b
4 changed files with 20 additions and 28 deletions
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22
fs/ceph/super.c
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@@ -637,8 +637,6 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
struct ceph_options *opt)
{
struct ceph_fs_client *fsc;
int page_count;
size_t size;
int err;
fsc = kzalloc(sizeof(*fsc), GFP_KERNEL);
@@ -686,22 +684,12 @@ static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt,
if (!fsc->cap_wq)
goto fail_inode_wq;
/* set up mempools */
err = -ENOMEM;
page_count = fsc->mount_options->wsize >> PAGE_SHIFT;
size = sizeof (struct page *) * (page_count ? page_count : 1);
fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size);
if (!fsc->wb_pagevec_pool)
goto fail_cap_wq;
spin_lock(&ceph_fsc_lock);
list_add_tail(&fsc->metric_wakeup, &ceph_fsc_list);
spin_unlock(&ceph_fsc_lock);
return fsc;
fail_cap_wq:
destroy_workqueue(fsc->cap_wq);
fail_inode_wq:
destroy_workqueue(fsc->inode_wq);
fail_client:
@@ -732,8 +720,6 @@ static void destroy_fs_client(struct ceph_fs_client *fsc)
destroy_workqueue(fsc->inode_wq);
destroy_workqueue(fsc->cap_wq);
mempool_destroy(fsc->wb_pagevec_pool);
destroy_mount_options(fsc->mount_options);
ceph_destroy_client(fsc->client);
@@ -752,6 +738,7 @@ struct kmem_cache *ceph_dentry_cachep;
struct kmem_cache *ceph_file_cachep;
struct kmem_cache *ceph_dir_file_cachep;
struct kmem_cache *ceph_mds_request_cachep;
mempool_t *ceph_wb_pagevec_pool;
static void ceph_inode_init_once(void *foo)
{
@@ -796,6 +783,10 @@ static int __init init_caches(void)
if (!ceph_mds_request_cachep)
goto bad_mds_req;
ceph_wb_pagevec_pool = mempool_create_kmalloc_pool(10, CEPH_MAX_WRITE_SIZE >> PAGE_SHIFT);
if (!ceph_wb_pagevec_pool)
goto bad_pagevec_pool;
error = ceph_fscache_register();
if (error)
goto bad_fscache;
@@ -804,6 +795,8 @@ static int __init init_caches(void)
bad_fscache:
kmem_cache_destroy(ceph_mds_request_cachep);
bad_pagevec_pool:
mempool_destroy(ceph_wb_pagevec_pool);
bad_mds_req:
kmem_cache_destroy(ceph_dir_file_cachep);
bad_dir_file:
@@ -834,6 +827,7 @@ static void destroy_caches(void)
kmem_cache_destroy(ceph_file_cachep);
kmem_cache_destroy(ceph_dir_file_cachep);
kmem_cache_destroy(ceph_mds_request_cachep);
mempool_destroy(ceph_wb_pagevec_pool);
ceph_fscache_unregister();
}