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Message-ID: <AANLkTimZVnX1uEcQtmdXA0Sjxh_EMjsxSvAVU2qI1jUE@mail.gmail.com>
Date: Fri, 18 Jun 2010 17:35:22 -0700
From: Divyesh Shah <dpshah@...gle.com>
To: Vivek Goyal <vgoyal@...hat.com>
Cc: linux kernel mailing list <linux-kernel@...r.kernel.org>,
Jens Axboe <axboe@...nel.dk>, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] cfq-iosched: Fixed boot warning with BLK_CGROUP=y and
CFQ_GROUP_IOSCHED=n
On Fri, Jun 18, 2010 at 7:39 AM, Vivek Goyal <vgoyal@...hat.com> wrote:
> Hi Jens,
>
> Few days back Ingo noticed a CFQ boot time warning. This patch fixes it.
> The issue here is that with CFQ_GROUP_IOSCHED=n, CFQ should not really
> be making blkio stat related calls.
>
>> Hm, it's still not entirely fixed, as of 2.6.35-rc2-00131-g7908a9e. With
>> some
>> configs i get bad spinlock warnings during bootup:
>>
>> [ 28.968013] initcall net_olddevs_init+0x0/0x82 returned 0 after 93750
>> usecs
>> [ 28.972003] calling b44_init+0x0/0x55 @ 1
>> [ 28.976009] bus: 'pci': add driver b44
>> [ 28.976374] sda:
>> [ 28.978157] BUG: spinlock bad magic on CPU#1, async/0/117
>> [ 28.980000] lock: 7e1c5bbc, .magic: 00000000, .owner: <none>/-1, +.owner_cpu: 0
>> [ 28.980000] Pid: 117, comm: async/0 Not tainted +2.6.35-rc2-tip-01092-g010e7ef-dirty #8183
>> [ 28.980000] Call Trace:
>> [ 28.980000] [<41ba6d55>] ? printk+0x20/0x24
>> [ 28.980000] [<4134b7b7>] spin_bug+0x7c/0x87
>> [ 28.980000] [<4134b853>] do_raw_spin_lock+0x1e/0x123
>> [ 28.980000] [<41ba92ca>] ? _raw_spin_lock_irqsave+0x12/0x20
>> [ 28.980000] [<41ba92d2>] _raw_spin_lock_irqsave+0x1a/0x20
>> [ 28.980000] [<4133476f>] blkiocg_update_io_add_stats+0x25/0xfb
>> [ 28.980000] [<41335dae>] ? cfq_prio_tree_add+0xb1/0xc1
>> [ 28.980000] [<41337bc7>] cfq_insert_request+0x8c/0x425
>
>
> Signed-off-by: Vivek Goyal <vgoyal@...hat.com>
Looks good to me.
Acked-by: Divyesh Shah <dpshah@...gle.com>
> ---
> block/cfq-iosched.c | 54 ++++++++++++------------
> block/cfq.h | 115 ++++++++++++++++++++++++++++++++++++++++++++++++++++
> 2 files changed, 142 insertions(+), 27 deletions(-)
>
> Index: linux-2.6/block/cfq-iosched.c
> ===================================================================
> --- linux-2.6.orig/block/cfq-iosched.c 2010-06-18 09:40:46.403163874 -0400
> +++ linux-2.6/block/cfq-iosched.c 2010-06-18 09:47:58.747339881 -0400
> @@ -14,7 +14,7 @@
> #include <linux/rbtree.h>
> #include <linux/ioprio.h>
> #include <linux/blktrace_api.h>
> -#include "blk-cgroup.h"
> +#include "cfq.h"
>
> /*
> * tunables
> @@ -879,7 +879,7 @@
> if (!RB_EMPTY_NODE(&cfqg->rb_node))
> cfq_rb_erase(&cfqg->rb_node, st);
> cfqg->saved_workload_slice = 0;
> - blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
> + cfq_blkiocg_update_dequeue_stats(&cfqg->blkg, 1);
> }
>
> static inline unsigned int cfq_cfqq_slice_usage(struct cfq_queue *cfqq)
> @@ -939,8 +939,8 @@
>
> cfq_log_cfqg(cfqd, cfqg, "served: vt=%llu min_vt=%llu", cfqg->vdisktime,
> st->min_vdisktime);
> - blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);
> - blkiocg_set_start_empty_time(&cfqg->blkg);
> + cfq_blkiocg_update_timeslice_used(&cfqg->blkg, used_sl);
> + cfq_blkiocg_set_start_empty_time(&cfqg->blkg);
> }
>
> #ifdef CONFIG_CFQ_GROUP_IOSCHED
> @@ -995,7 +995,7 @@
>
> /* Add group onto cgroup list */
> sscanf(dev_name(bdi->dev), "%u:%u", &major, &minor);
> - blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd,
> + cfq_blkiocg_add_blkio_group(blkcg, &cfqg->blkg, (void *)cfqd,
> MKDEV(major, minor));
> cfqg->weight = blkcg_get_weight(blkcg, cfqg->blkg.dev);
>
> @@ -1079,7 +1079,7 @@
> * it from cgroup list, then it will take care of destroying
> * cfqg also.
> */
> - if (!blkiocg_del_blkio_group(&cfqg->blkg))
> + if (!cfq_blkiocg_del_blkio_group(&cfqg->blkg))
> cfq_destroy_cfqg(cfqd, cfqg);
> }
> }
> @@ -1421,10 +1421,10 @@
> {
> elv_rb_del(&cfqq->sort_list, rq);
> cfqq->queued[rq_is_sync(rq)]--;
> - blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq),
> - rq_is_sync(rq));
> + cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
> + rq_data_dir(rq), rq_is_sync(rq));
> cfq_add_rq_rb(rq);
> - blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
> + cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
> &cfqq->cfqd->serving_group->blkg, rq_data_dir(rq),
> rq_is_sync(rq));
> }
> @@ -1482,8 +1482,8 @@
> cfq_del_rq_rb(rq);
>
> cfqq->cfqd->rq_queued--;
> - blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(rq),
> - rq_is_sync(rq));
> + cfq_blkiocg_update_io_remove_stats(&(RQ_CFQG(rq))->blkg,
> + rq_data_dir(rq), rq_is_sync(rq));
> if (rq_is_meta(rq)) {
> WARN_ON(!cfqq->meta_pending);
> cfqq->meta_pending--;
> @@ -1518,8 +1518,8 @@
> static void cfq_bio_merged(struct request_queue *q, struct request *req,
> struct bio *bio)
> {
> - blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg, bio_data_dir(bio),
> - cfq_bio_sync(bio));
> + cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(req))->blkg,
> + bio_data_dir(bio), cfq_bio_sync(bio));
> }
>
> static void
> @@ -1539,8 +1539,8 @@
> if (cfqq->next_rq == next)
> cfqq->next_rq = rq;
> cfq_remove_request(next);
> - blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg, rq_data_dir(next),
> - rq_is_sync(next));
> + cfq_blkiocg_update_io_merged_stats(&(RQ_CFQG(rq))->blkg,
> + rq_data_dir(next), rq_is_sync(next));
> }
>
> static int cfq_allow_merge(struct request_queue *q, struct request *rq,
> @@ -1571,7 +1571,7 @@
> static inline void cfq_del_timer(struct cfq_data *cfqd, struct cfq_queue *cfqq)
> {
> del_timer(&cfqd->idle_slice_timer);
> - blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
> + cfq_blkiocg_update_idle_time_stats(&cfqq->cfqg->blkg);
> }
>
> static void __cfq_set_active_queue(struct cfq_data *cfqd,
> @@ -1580,7 +1580,7 @@
> if (cfqq) {
> cfq_log_cfqq(cfqd, cfqq, "set_active wl_prio:%d wl_type:%d",
> cfqd->serving_prio, cfqd->serving_type);
> - blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
> + cfq_blkiocg_update_avg_queue_size_stats(&cfqq->cfqg->blkg);
> cfqq->slice_start = 0;
> cfqq->dispatch_start = jiffies;
> cfqq->allocated_slice = 0;
> @@ -1911,7 +1911,7 @@
> sl = cfqd->cfq_slice_idle;
>
> mod_timer(&cfqd->idle_slice_timer, jiffies + sl);
> - blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
> + cfq_blkiocg_update_set_idle_time_stats(&cfqq->cfqg->blkg);
> cfq_log_cfqq(cfqd, cfqq, "arm_idle: %lu", sl);
> }
>
> @@ -1931,7 +1931,7 @@
> elv_dispatch_sort(q, rq);
>
> cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]++;
> - blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
> + cfq_blkiocg_update_dispatch_stats(&cfqq->cfqg->blkg, blk_rq_bytes(rq),
> rq_data_dir(rq), rq_is_sync(rq));
> }
>
> @@ -3248,7 +3248,7 @@
> cfq_clear_cfqq_wait_request(cfqq);
> __blk_run_queue(cfqd->queue);
> } else {
> - blkiocg_update_idle_time_stats(
> + cfq_blkiocg_update_idle_time_stats(
> &cfqq->cfqg->blkg);
> cfq_mark_cfqq_must_dispatch(cfqq);
> }
> @@ -3276,7 +3276,7 @@
> rq_set_fifo_time(rq, jiffies + cfqd->cfq_fifo_expire[rq_is_sync(rq)]);
> list_add_tail(&rq->queuelist, &cfqq->fifo);
> cfq_add_rq_rb(rq);
> - blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
> + cfq_blkiocg_update_io_add_stats(&(RQ_CFQG(rq))->blkg,
> &cfqd->serving_group->blkg, rq_data_dir(rq),
> rq_is_sync(rq));
> cfq_rq_enqueued(cfqd, cfqq, rq);
> @@ -3364,9 +3364,9 @@
> WARN_ON(!cfqq->dispatched);
> cfqd->rq_in_driver--;
> cfqq->dispatched--;
> - blkiocg_update_completion_stats(&cfqq->cfqg->blkg, rq_start_time_ns(rq),
> - rq_io_start_time_ns(rq), rq_data_dir(rq),
> - rq_is_sync(rq));
> + cfq_blkiocg_update_completion_stats(&cfqq->cfqg->blkg,
> + rq_start_time_ns(rq), rq_io_start_time_ns(rq),
> + rq_data_dir(rq), rq_is_sync(rq));
>
> cfqd->rq_in_flight[cfq_cfqq_sync(cfqq)]--;
>
> @@ -3730,7 +3730,7 @@
>
> cfq_put_async_queues(cfqd);
> cfq_release_cfq_groups(cfqd);
> - blkiocg_del_blkio_group(&cfqd->root_group.blkg);
> + cfq_blkiocg_del_blkio_group(&cfqd->root_group.blkg);
>
> spin_unlock_irq(q->queue_lock);
>
> @@ -3798,8 +3798,8 @@
> */
> atomic_set(&cfqg->ref, 1);
> rcu_read_lock();
> - blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg, (void *)cfqd,
> - 0);
> + cfq_blkiocg_add_blkio_group(&blkio_root_cgroup, &cfqg->blkg,
> + (void *)cfqd, 0);
> rcu_read_unlock();
> #endif
> /*
> Index: linux-2.6/block/cfq.h
> ===================================================================
> --- /dev/null 1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6/block/cfq.h 2010-06-18 09:41:23.256220395 -0400
> @@ -0,0 +1,115 @@
> +#ifndef _CFQ_H
> +#define _CFQ_H
> +#include "blk-cgroup.h"
> +
> +#ifdef CONFIG_CFQ_GROUP_IOSCHED
> +static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
> + struct blkio_group *curr_blkg, bool direction, bool sync)
> +{
> + blkiocg_update_io_add_stats(blkg, curr_blkg, direction, sync);
> +}
> +
> +static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> + unsigned long dequeue)
> +{
> + blkiocg_update_dequeue_stats(blkg, dequeue);
> +}
> +
> +static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
> + unsigned long time)
> +{
> + blkiocg_update_timeslice_used(blkg, time);
> +}
> +
> +static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg)
> +{
> + blkiocg_set_start_empty_time(blkg);
> +}
> +
> +static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
> + bool direction, bool sync)
> +{
> + blkiocg_update_io_remove_stats(blkg, direction, sync);
> +}
> +
> +static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
> + bool direction, bool sync)
> +{
> + blkiocg_update_io_merged_stats(blkg, direction, sync);
> +}
> +
> +static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
> +{
> + blkiocg_update_idle_time_stats(blkg);
> +}
> +
> +static inline void
> +cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg)
> +{
> + blkiocg_update_avg_queue_size_stats(blkg);
> +}
> +
> +static inline void
> +cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg)
> +{
> + blkiocg_update_set_idle_time_stats(blkg);
> +}
> +
> +static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
> + uint64_t bytes, bool direction, bool sync)
> +{
> + blkiocg_update_dispatch_stats(blkg, bytes, direction, sync);
> +}
> +
> +static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync)
> +{
> + cfq_blkiocg_update_completion_stats(blkg, start_time, io_start_time,
> + direction, sync);
> +}
> +
> +static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
> + struct blkio_group *blkg, void *key, dev_t dev) {
> + blkiocg_add_blkio_group(blkcg, blkg, key, dev);
> +}
> +
> +static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
> +{
> + return blkiocg_del_blkio_group(blkg);
> +}
> +
> +#else /* CFQ_GROUP_IOSCHED */
> +static inline void cfq_blkiocg_update_io_add_stats(struct blkio_group *blkg,
> + struct blkio_group *curr_blkg, bool direction, bool sync) {}
> +
> +static inline void cfq_blkiocg_update_dequeue_stats(struct blkio_group *blkg,
> + unsigned long dequeue) {}
> +
> +static inline void cfq_blkiocg_update_timeslice_used(struct blkio_group *blkg,
> + unsigned long time) {}
> +static inline void cfq_blkiocg_set_start_empty_time(struct blkio_group *blkg) {}
> +static inline void cfq_blkiocg_update_io_remove_stats(struct blkio_group *blkg,
> + bool direction, bool sync) {}
> +static inline void cfq_blkiocg_update_io_merged_stats(struct blkio_group *blkg,
> + bool direction, bool sync) {}
> +static inline void cfq_blkiocg_update_idle_time_stats(struct blkio_group *blkg)
> +{
> +}
> +static inline void
> +cfq_blkiocg_update_avg_queue_size_stats(struct blkio_group *blkg) {}
> +
> +static inline void
> +cfq_blkiocg_update_set_idle_time_stats(struct blkio_group *blkg) {}
> +
> +static inline void cfq_blkiocg_update_dispatch_stats(struct blkio_group *blkg,
> + uint64_t bytes, bool direction, bool sync) {}
> +static inline void cfq_blkiocg_update_completion_stats(struct blkio_group *blkg, uint64_t start_time, uint64_t io_start_time, bool direction, bool sync) {}
> +
> +static inline void cfq_blkiocg_add_blkio_group(struct blkio_cgroup *blkcg,
> + struct blkio_group *blkg, void *key, dev_t dev) {}
> +static inline int cfq_blkiocg_del_blkio_group(struct blkio_group *blkg)
> +{
> + return 0;
> +}
> +
> +#endif /* CFQ_GROUP_IOSCHED */
> +#endif
>
--
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