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authorChristoph Hellwig <hch@lst.de>2021-10-12 11:33:01 +0200
committerJens Axboe <axboe@kernel.dk>2021-10-15 21:02:57 -0600
commitc41108049d143304faf06852c7181262b7b0d242 (patch)
treea6212c9aa366bbe05466a237f79e1f57f4b3346a /block/kyber-iosched.c
parentaec89dc5d421200b353d99a2bfff9e0967f67037 (diff)
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kyber: avoid q->disk dereferences in trace points
q->disk becomes invalid after the gendisk is removed. Work around this by caching the dev_t for the tracepoints. The real fix would be to properly tear down the I/O schedulers with the gendisk, but that is a much more invasive change. Signed-off-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20211012093301.GA27795@lst.de Tested-by: Yi Zhang <yi.zhang@redhat.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block/kyber-iosched.c')
-rw-r--r--block/kyber-iosched.c10
1 files changed, 6 insertions, 4 deletions
diff --git a/block/kyber-iosched.c b/block/kyber-iosched.c
index 15a8be57203d..a0ffbabfac2c 100644
--- a/block/kyber-iosched.c
+++ b/block/kyber-iosched.c
@@ -151,6 +151,7 @@ struct kyber_ctx_queue {
struct kyber_queue_data {
struct request_queue *q;
+ dev_t dev;
/*
* Each scheduling domain has a limited number of in-flight requests
@@ -257,7 +258,7 @@ static int calculate_percentile(struct kyber_queue_data *kqd,
}
memset(buckets, 0, sizeof(kqd->latency_buckets[sched_domain][type]));
- trace_kyber_latency(kqd->q, kyber_domain_names[sched_domain],
+ trace_kyber_latency(kqd->dev, kyber_domain_names[sched_domain],
kyber_latency_type_names[type], percentile,
bucket + 1, 1 << KYBER_LATENCY_SHIFT, samples);
@@ -270,7 +271,7 @@ static void kyber_resize_domain(struct kyber_queue_data *kqd,
depth = clamp(depth, 1U, kyber_depth[sched_domain]);
if (depth != kqd->domain_tokens[sched_domain].sb.depth) {
sbitmap_queue_resize(&kqd->domain_tokens[sched_domain], depth);
- trace_kyber_adjust(kqd->q, kyber_domain_names[sched_domain],
+ trace_kyber_adjust(kqd->dev, kyber_domain_names[sched_domain],
depth);
}
}
@@ -366,6 +367,7 @@ static struct kyber_queue_data *kyber_queue_data_alloc(struct request_queue *q)
goto err;
kqd->q = q;
+ kqd->dev = disk_devt(q->disk);
kqd->cpu_latency = alloc_percpu_gfp(struct kyber_cpu_latency,
GFP_KERNEL | __GFP_ZERO);
@@ -774,7 +776,7 @@ kyber_dispatch_cur_domain(struct kyber_queue_data *kqd,
list_del_init(&rq->queuelist);
return rq;
} else {
- trace_kyber_throttled(kqd->q,
+ trace_kyber_throttled(kqd->dev,
kyber_domain_names[khd->cur_domain]);
}
} else if (sbitmap_any_bit_set(&khd->kcq_map[khd->cur_domain])) {
@@ -787,7 +789,7 @@ kyber_dispatch_cur_domain(struct kyber_queue_data *kqd,
list_del_init(&rq->queuelist);
return rq;
} else {
- trace_kyber_throttled(kqd->q,
+ trace_kyber_throttled(kqd->dev,
kyber_domain_names[khd->cur_domain]);
}
}