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RDS: fix fmr pool dirty_count 

In rds_ib_flush_mr_pool(), dirty_count accounts the clean ones
which is wrong. This can lead to a negative dirty count value.

Lets fix it.

Signed-off-by: Wengang Wang <wen.gang.wang@oracle.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Wengang Wang 2015-08-25 12:02:00 -07:00 committed by David S. Miller
parent 3f6b314303
commit 6116c2030f
1 changed files with 9 additions and 6 deletions
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15
net/rds/ib_rdma.c
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@ -528,11 +528,13 @@ static inline unsigned int rds_ib_flush_goal(struct rds_ib_mr_pool *pool, int fr
/* /*
* given an llist of mrs, put them all into the list_head for more processing * given an llist of mrs, put them all into the list_head for more processing
*/ */
static void llist_append_to_list(struct llist_head *llist, struct list_head *list) static unsigned int llist_append_to_list(struct llist_head *llist,
struct list_head *list)
{ {
struct rds_ib_mr *ibmr; struct rds_ib_mr *ibmr;
struct llist_node *node; struct llist_node *node;
struct llist_node *next; struct llist_node *next;
unsigned int count = 0;
node = llist_del_all(llist); node = llist_del_all(llist);
while (node) { while (node) {
@ -540,7 +542,9 @@ static void llist_append_to_list(struct llist_head *llist, struct list_head *lis
ibmr = llist_entry(node, struct rds_ib_mr, llnode); ibmr = llist_entry(node, struct rds_ib_mr, llnode);
list_add_tail(&ibmr->unmap_list, list); list_add_tail(&ibmr->unmap_list, list);
node = next; node = next;
count++;
} }
return count;
} }
/* /*
@ -581,7 +585,7 @@ static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
LIST_HEAD(unmap_list); LIST_HEAD(unmap_list);
LIST_HEAD(fmr_list); LIST_HEAD(fmr_list);
unsigned long unpinned = 0; unsigned long unpinned = 0;
unsigned int nfreed = 0, ncleaned = 0, free_goal; unsigned int nfreed = 0, dirty_to_clean = 0, free_goal;
int ret = 0; int ret = 0;
rds_ib_stats_inc(s_ib_rdma_mr_pool_flush); rds_ib_stats_inc(s_ib_rdma_mr_pool_flush);
@ -623,8 +627,8 @@ static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
/* Get the list of all MRs to be dropped. Ordering matters - /* Get the list of all MRs to be dropped. Ordering matters -
* we want to put drop_list ahead of free_list. * we want to put drop_list ahead of free_list.
*/ */
llist_append_to_list(&pool->drop_list, &unmap_list); dirty_to_clean = llist_append_to_list(&pool->drop_list, &unmap_list);
llist_append_to_list(&pool->free_list, &unmap_list); dirty_to_clean += llist_append_to_list(&pool->free_list, &unmap_list);
if (free_all) if (free_all)
llist_append_to_list(&pool->clean_list, &unmap_list); llist_append_to_list(&pool->clean_list, &unmap_list);
@ -652,7 +656,6 @@ static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
kfree(ibmr); kfree(ibmr);
nfreed++; nfreed++;
} }
ncleaned++;
} }
if (!list_empty(&unmap_list)) { if (!list_empty(&unmap_list)) {
@ -678,7 +681,7 @@ static int rds_ib_flush_mr_pool(struct rds_ib_mr_pool *pool,
} }
atomic_sub(unpinned, &pool->free_pinned); atomic_sub(unpinned, &pool->free_pinned);
atomic_sub(ncleaned, &pool->dirty_count); atomic_sub(dirty_to_clean, &pool->dirty_count);
atomic_sub(nfreed, &pool->item_count); atomic_sub(nfreed, &pool->item_count);
out: out: