diff options
| author | Chengguang Xu <cgxu519@icloud.com> | 2018-02-24 18:35:29 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2018-04-02 10:12:46 +0200 |
| commit | e327ce068518e38c0182739e879b9dce477c8d85 (patch) | |
| tree | a727fff9856f7a0a6497c1425372056498cd4fc5 /fs/ceph | |
| parent | b884014a91a49ed0e7198d276b28887cc48363bd (diff) | |
| download | linux-e327ce068518e38c0182739e879b9dce477c8d85.tar.gz linux-e327ce068518e38c0182739e879b9dce477c8d85.tar.bz2 linux-e327ce068518e38c0182739e879b9dce477c8d85.zip | |
ceph: optimizing cap allocation
When setting high volume of caps_min_count or having many
unreserved caps, unused caps may always keep in the ->caps_list
even can't get new cap from kmem_cache_alloc because lack of
maximum limitation of caps_avail_count. Hence reuse caps in
->caps_list if available, it's maybe better than setting max
limitation of caps_avail_count and releasing unused caps when
reaching the limit.
Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
Reviewed-by: "Yan, Zheng" <zyan@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph')
| -rw-r--r-- | fs/ceph/caps.c | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c index 1d02648788e3..421cdce71fb0 100644 --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -285,7 +285,23 @@ struct ceph_cap *ceph_get_cap(struct ceph_mds_client *mdsc, mdsc->caps_use_count++; mdsc->caps_total_count++; spin_unlock(&mdsc->caps_list_lock); + } else { + spin_lock(&mdsc->caps_list_lock); + if (mdsc->caps_avail_count) { + BUG_ON(list_empty(&mdsc->caps_list)); + + mdsc->caps_avail_count--; + mdsc->caps_use_count++; + cap = list_first_entry(&mdsc->caps_list, + struct ceph_cap, caps_item); + list_del(&cap->caps_item); + + BUG_ON(mdsc->caps_total_count != mdsc->caps_use_count + + mdsc->caps_reserve_count + mdsc->caps_avail_count); + } + spin_unlock(&mdsc->caps_list_lock); } + return cap; } |