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| author | Chris Mason <chris.mason@oracle.com> | 2012-02-03 11:07:54 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-08-15 12:04:24 -0700 |
| commit | 65dedd7fe1f224e9989181d161e23f0a544d304f (patch) | |
| tree | 1bf881782c731426670ed84d8343af3f0313977c /net/rds | |
| parent | 907389b747e1ec8f7ff19c555dcfbcedfc4f7d67 (diff) | |
| download | linux-65dedd7fe1f224e9989181d161e23f0a544d304f.tar.bz2 | |
RDS: limit the number of times we loop in rds_send_xmit
This will kick the RDS worker thread if we have been looping
too long.
Original commit from 2012 updated to include a change by
Venkat Venkatsubra <venkat.x.venkatsubra@oracle.com>
that triggers "must_wake" if "rds_ib_recv_refill_one" fails.
Signed-off-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds')
| -rw-r--r-- | net/rds/ib_recv.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/net/rds/ib_recv.c b/net/rds/ib_recv.c index 3cae88cbdaa0..1a8a4a760b84 100644 --- a/net/rds/ib_recv.c +++ b/net/rds/ib_recv.c @@ -385,6 +385,7 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp) unsigned int posted = 0; int ret = 0; bool can_wait = !!(gfp & __GFP_DIRECT_RECLAIM); + bool must_wake = false; u32 pos; /* the goal here is to just make sure that someone, somewhere @@ -405,6 +406,7 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp) recv = &ic->i_recvs[pos]; ret = rds_ib_recv_refill_one(conn, recv, gfp); if (ret) { + must_wake = true; break; } @@ -423,6 +425,11 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp) } posted++; + + if ((posted > 128 && need_resched()) || posted > 8192) { + must_wake = true; + break; + } } /* We're doing flow control - update the window. */ @@ -445,10 +452,13 @@ void rds_ib_recv_refill(struct rds_connection *conn, int prefill, gfp_t gfp) * if we should requeue. */ if (rds_conn_up(conn) && - ((can_wait && rds_ib_ring_low(&ic->i_recv_ring)) || + (must_wake || + (can_wait && rds_ib_ring_low(&ic->i_recv_ring)) || rds_ib_ring_empty(&ic->i_recv_ring))) { queue_delayed_work(rds_wq, &conn->c_recv_w, 1); } + if (can_wait) + cond_resched(); } /* |