[PATCH 0/4] Don't cache unused glocks

This patch series changes gfs2 to drop glocks as soon as possible after
their corresponding inodes are evicted (by being deleted or being forced
out due to memory pressure).  This causes the corresponding DLM locks to
be unlocked much sooner, which smooths out DLM unlocking load spikes
at unmount time.

Before this patch set, the glocks were only forced out in response to
memory pressure, as well as at filesystem unmount time.  Unlocking the
corresponding DLM locks is somewhat slow though, so depending on the
workload, a lot of memory could get tied up unnecessarily.  In addition,
some workloads could cause filesystem unmount time to skyrocket.

By not caching unused glocks, we can also get rid of the glocks LRU
list.

Andreas Gruenbacher (4):
  gfs2: Enable automatic glock hash table shrinking
  gfs2: Don't cache unreferenced glocks
  gfs2: Skip dlm unlocks earlier
  gfs2: Remove the glock lru list and shrinker

 fs/gfs2/glock.c      | 225 ++++---------------------------------------
 fs/gfs2/glock.h      |   2 +-
 fs/gfs2/incore.h     |   7 +-
 fs/gfs2/lock_dlm.c   |   2 +-
 fs/gfs2/main.c       |   1 -
 fs/gfs2/ops_fstype.c |   5 +-
 fs/gfs2/super.c      |   2 +-
 fs/gfs2/sys.c        |   2 -
 fs/gfs2/trace_gfs2.h |   1 -
 9 files changed, 31 insertions(+), 216 deletions(-)

-- 
2.55.0