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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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include/linux/ceph/libceph.h
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@@ -282,6 +282,7 @@ extern struct kmem_cache *ceph_dentry_cachep;
extern struct kmem_cache *ceph_file_cachep;
extern struct kmem_cache *ceph_dir_file_cachep;
extern struct kmem_cache *ceph_mds_request_cachep;
extern mempool_t *ceph_wb_pagevec_pool;
/* ceph_common.c */
extern bool libceph_compatible(void *data);