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rds: per-rm flush_wait waitq 

This removes a global waitqueue used to wait for rds messages
and replaces it with a waitqueue inside the rds_message struct.

The global waitqueue turns into a global lock and significantly
bottlenecks operations on large machines.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2010-04-21 13:09:28 -07:00 committed by Andy Grover
parent 976673ee1b
commit c83188dcd7
2 changed files with 5 additions and 4 deletions
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7
net/rds/message.c
View File

@ -35,8 +35,6 @@
#include "rds.h"
static DECLARE_WAIT_QUEUE_HEAD(rds_message_flush_waitq);
static unsigned int rds_exthdr_size[__RDS_EXTHDR_MAX] = {
[RDS_EXTHDR_NONE] = 0,
[RDS_EXTHDR_VERSION] = sizeof(struct rds_ext_header_version),
@ -226,6 +224,7 @@ struct rds_message *rds_message_alloc(unsigned int extra_len, gfp_t gfp)
INIT_LIST_HEAD(&rm->m_sock_item);
INIT_LIST_HEAD(&rm->m_conn_item);
spin_lock_init(&rm->m_rs_lock);
init_waitqueue_head(&rm->m_flush_wait);
out:
return rm;
@ -399,14 +398,14 @@ int rds_message_inc_copy_to_user(struct rds_incoming *inc,
*/
void rds_message_wait(struct rds_message *rm)
{
wait_event_interruptible(rds_message_flush_waitq,
wait_event_interruptible(rm->m_flush_wait,
!test_bit(RDS_MSG_MAPPED, &rm->m_flags));
}
void rds_message_unmapped(struct rds_message *rm)
{
clear_bit(RDS_MSG_MAPPED, &rm->m_flags);
wake_up_interruptible(&rds_message_flush_waitq);
wake_up_interruptible(&rm->m_flush_wait);
}
EXPORT_SYMBOL_GPL(rds_message_unmapped);

2
net/rds/rds.h
View File

@ -301,6 +301,8 @@ struct rds_message {
* -> rs->rs_lock
*/
spinlock_t m_rs_lock;
wait_queue_head_t m_flush_wait;
struct rds_sock *m_rs;
/* cookie to send to remote, in rds header */