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authorYi Zou <yi.zou@intel.com>2012-08-30 16:26:25 -0700
committerJens Axboe <axboe@kernel.dk>2012-08-30 16:26:25 -0700
commit37d7b34f05b7bcca364bdf47d8955e766094a244 (patch)
treeab1ae9d7b1f92212f7b19f819683c4d6a510d71c /block
parent155e36d40cf31c17f2b629fc2f2f5527e4cfc324 (diff)
downloadlinux-linaro-stable-37d7b34f05b7bcca364bdf47d8955e766094a244.tar.gz
block: rate-limit the error message from failing commands
When performing a cable pull test w/ active stress I/O using fio over a dual port Intel 82599 FCoE CNA, w/ 256LUNs on one port and about 32LUNs on the other, it is observed that the system becomes not usable due to scsi-ml being busy printing the error messages for all the failing commands. I don't believe this problem is specific to FCoE and these commands are anyway failing due to link being down (DID_NO_CONNECT), just rate-limit the messages here to solve this issue. v2->v1: use __ratelimit() as Tomas Henzl mentioned as the proper way for rate-limit per function. However, in this case, the failed i/o gets to blk_end_request_err() and then blk_update_request(), which also has to be rate-limited, as added in the v2 of this patch. v3-v2: resolved conflict to apply on current 3.6-rc3 upstream tip. Signed-off-by: Yi Zou <yi.zou@intel.com> Cc: www.Open-FCoE.org <devel@open-fcoe.org> Cc: Tomas Henzl <thenzl@redhat.com> Cc: <linux-scsi@vger.kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 4b4dbdfbca89..ee3cb3a5e278 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -2254,9 +2254,11 @@ bool blk_update_request(struct request *req, int error, unsigned int nr_bytes)
error_type = "I/O";
break;
}
- printk(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
- error_type, req->rq_disk ? req->rq_disk->disk_name : "?",
- (unsigned long long)blk_rq_pos(req));
+ printk_ratelimited(KERN_ERR "end_request: %s error, dev %s, sector %llu\n",
+ error_type, req->rq_disk ?
+ req->rq_disk->disk_name : "?",
+ (unsigned long long)blk_rq_pos(req));
+
}
blk_account_io_completion(req, nr_bytes);