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| author |   Santosh Shilimkar <santosh.shilimkar@oracle.com> | 2012-02-03 11:09:23 -0500 |
|---|---|---|
| committer |   Santosh Shilimkar <ssantosh@kernel.org> | 2015-09-30 12:43:24 -0400 |
| commit | 8b0a6b461e2ccc95363e0547aa4f43ba2e02b096 (patch) | |
| tree | ab5d09ccb54b090f1ecf02af7466b236a0163328 /tools/perf/scripts/python/call-graph-from-postgresql.py | |
| parent | RDS: use kfree_rcu in rds_ib_remove_ipaddr (diff) | |
| download | wireguard-linux-8b0a6b461e2ccc95363e0547aa4f43ba2e02b096.tar.xz wireguard-linux-8b0a6b461e2ccc95363e0547aa4f43ba2e02b096.zip | |
RDS: make socket bind/release locking scheme simple and more efficient
RDS bind and release locking scheme is very inefficient. It
uses RCU for maintaining the bind hash-table which is great but
it also needs to hold spinlock for [add/remove]_bound(). So
overall usecase, the hash-table concurrent speedup doesn't pay off.
In fact blocking nature of synchronize_rcu() makes the RDS
socket shutdown too slow which hurts RDS performance since
connection shutdown and re-connect happens quite often to
maintain the RC part of the protocol.
So we make the locking scheme simpler and more efficient by
replacing spin_locks with reader/writer locks and getting rid
off rcu for bind hash-table.
In subsequent patch, we also covert the global lock with per-bucket
lock to reduce the global lock contention.
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Diffstat (limited to 'tools/perf/scripts/python/call-graph-from-postgresql.py')
0 files changed, 0 insertions, 0 deletions