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RDS: flush fmrs before allocating new ones

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Flushing FMRs is somewhat expensive, and is currently kicked off when
the interrupt handler notices that we are getting low.  The result of
this is that FMR flushing only happens from the interrupt cpus.

This spreads the load more effectively by triggering flushes just before
we allocate a new FMR.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2010-07-19 17:06:46 -07:00 committed by Andy Grover
parent b4e1da3c9a
commit 8576f374ac
1 changed files with 5 additions and 2 deletions
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7
net/rds/ib_rdma.c
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@ -38,6 +38,8 @@
#include "ib.h"
#include "xlist.h"
struct workqueue_struct *rds_ib_fmr_wq;
static DEFINE_PER_CPU(unsigned long, clean_list_grace);
#define CLEAN_LIST_BUSY_BIT 0
@ -304,6 +306,9 @@ static struct rds_ib_mr *rds_ib_alloc_fmr(struct rds_ib_device *rds_ibdev)
struct rds_ib_mr *ibmr = NULL;
int err = 0, iter = 0;
if (atomic_read(&pool->dirty_count) >= pool->max_items / 10)
queue_delayed_work(rds_ib_fmr_wq, &pool->flush_worker, 10);
while (1) {
ibmr = rds_ib_reuse_fmr(pool);
if (ibmr)
@ -691,8 +696,6 @@ out_nolock:
return ret;
}
struct workqueue_struct *rds_ib_fmr_wq;
int rds_ib_fmr_init(void)
{
rds_ib_fmr_wq = create_workqueue("rds_fmr_flushd");