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Chris Mason 6fa70da608 rds: recycle FMRs through lockless lists 
FRM allocation and recycling is performance critical and fairly lock
intensive.  The current code has a per connection lock that all
processes bang on and it becomes a major bottleneck on large systems.

This changes things to use a number of cmpxchg based lists instead,
allowing us to go through the whole FMR lifecycle without locking inside
RDS.

Zach Brown pointed out that our usage of cmpxchg for xlist removal is
racey if someone manages to remove and add back an FMR struct into the list
while another CPU can see the FMR's address at the head of the list.

The second CPU might assume the list hasn't changed when in fact any
number of operations might have happened in between the deletion and
reinsertion.

This commit maintains a per cpu count of CPUs that are currently
in xlist removal, and establishes a grace period to make sure that
nobody can see an entry we have just removed from the list.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
2010-09-08 18:15:28 -07:00
..
af_rds.c rds: Use RCU for the bind lookup searches 2010-09-08 18:15:08 -07:00
bind.c rds: Use RCU for the bind lookup searches 2010-09-08 18:15:08 -07:00
cong.c RDS: Bypass workqueue when queueing cong updates 2010-09-08 18:12:16 -07:00
connection.c rds: fix rds_send_xmit() serialization 2010-09-08 18:15:27 -07:00
ib_cm.c RDS/IB: Add caching of frags and incs 2010-09-08 18:15:23 -07:00
ib_rdma.c rds: recycle FMRs through lockless lists 2010-09-08 18:15:28 -07:00
ib_recv.c RDS: use friendly gfp masks for prefill 2010-09-08 18:15:24 -07:00
ib_ring.c RDS/IW+IB: Set recv ring low water mark to 1/2 full. 2009-04-09 17:21:14 -07:00
ib_send.c rds: fix rds_send_xmit() serialization 2010-09-08 18:15:27 -07:00
ib_stats.c RDS: Move atomic stats from general to ib-specific area 2010-09-08 18:12:20 -07:00
ib_sysctl.c RDS: Remove unsignaled_bytes sysctl 2010-09-08 18:11:52 -07:00
ib.c RDS/IB: disconnect when IB devices are removed 2010-09-08 18:15:19 -07:00
ib.h RDS/IB: Add caching of frags and incs 2010-09-08 18:15:23 -07:00
info.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
info.h RDS: Info and stats 2009-02-26 23:39:25 -08:00
iw_cm.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
iw_rdma.c RDS: fold rdma.h into rds.h 2010-09-08 18:11:37 -07:00
iw_recv.c RDS: inc_purge() transport function unused - remove it 2010-09-08 18:11:46 -07:00
iw_ring.c RDS/IW+IB: Set recv ring low water mark to 1/2 full. 2009-04-09 17:21:14 -07:00
iw_send.c RDS: Rename data op members prefix from m_ to op_ 2010-09-08 18:11:59 -07:00
iw_stats.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu 2009-09-15 09:39:44 -07:00
iw_sysctl.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
iw.c RDS: Stop supporting old cong map sending method 2010-09-08 18:12:10 -07:00
iw.h RDS: Remove struct rds_rdma_op 2010-09-08 18:11:58 -07:00
Kconfig RDS: Modularize RDMA and TCP transports 2009-08-23 19:13:09 -07:00
loop.c RDS: Stop supporting old cong map sending method 2010-09-08 18:12:10 -07:00
loop.h RDS: loopback 2009-02-26 23:39:26 -08:00
Makefile RDS: Modularize RDMA and TCP transports 2009-08-23 19:13:09 -07:00
message.c rds: don't let RDS shutdown a connection while senders are present 2010-09-08 18:15:09 -07:00
page.c RDS: Use page_remainder_alloc() for recv bufs 2010-09-08 18:15:20 -07:00
rdma_transport.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2010-04-27 12:49:13 -07:00
rdma_transport.h RDS: Common RDMA transport code 2009-02-26 23:39:33 -08:00
rdma.c RDS: Add flag for silent ops. Do atomic op before RDMA 2010-09-08 18:12:06 -07:00
rds.h rds: fix rds_send_xmit() serialization 2010-09-08 18:15:27 -07:00
recv.c RDS: Whitespace 2010-09-08 18:11:44 -07:00
send.c rds: fix rds_send_xmit() serialization 2010-09-08 18:15:27 -07:00
stats.c RDS: Move atomic stats from general to ib-specific area 2010-09-08 18:12:20 -07:00
sysctl.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
tcp_connect.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
tcp_listen.c RDS: cleanup: remove "== NULL"s and "!= NULL"s in ptr comparisons 2010-09-08 18:11:32 -07:00
tcp_recv.c RDS: inc_purge() transport function unused - remove it 2010-09-08 18:11:46 -07:00
tcp_send.c RDS: Stop supporting old cong map sending method 2010-09-08 18:12:10 -07:00
tcp_stats.c RDS: Add TCP transport to RDS 2009-08-23 19:13:02 -07:00
tcp.c RDS: Stop supporting old cong map sending method 2010-09-08 18:12:10 -07:00
tcp.h RDS: Stop supporting old cong map sending method 2010-09-08 18:12:10 -07:00
threads.c rds: fix rds_send_xmit() serialization 2010-09-08 18:15:27 -07:00
transport.c RDS: Track transports via an array, not a list 2009-08-23 19:13:12 -07:00
xlist.h rds: recycle FMRs through lockless lists 2010-09-08 18:15:28 -07:00