From: John Garry <john.garry@huawei.com>
To: Hannes Reinecke <hare@suse.de>, Ming Lei <ming.lei@redhat.com>
Cc: <axboe@kernel.dk>, <jejb@linux.ibm.com>,
<martin.petersen@oracle.com>, <bvanassche@acm.org>,
<hch@infradead.org>, <linux-block@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <linux-scsi@vger.kernel.org>,
<virtualization@lists.linux-foundation.org>,
<esc.storagedev@microsemi.com>, <chenxiang66@hisilicon.com>,
Hannes Reinecke <hare@suse.com>
Subject: Re: [PATCH RFC v2 12/24] hpsa: use reserved commands
Date: Mon, 30 Mar 2020 14:42:45 +0100 [thread overview]
Message-ID: <c3f5c030-d735-c730-6ff9-19cb1cb50fe8@huawei.com> (raw)
In-Reply-To: <881b6a9b-2137-946f-a900-5c4e6cf1fe37@suse.de>
On 17/03/2020 09:48, Hannes Reinecke wrote:
> On 3/17/20 10:38 AM, John Garry wrote:
>> On 11/03/2020 08:10, Ming Lei wrote:
>>>> ands(struct ctlr_info *h)
>>>> @@ -5803,6 +5803,7 @@ static int hpsa_scsi_host_alloc(struct
>>>> ctlr_info *h)
>>>> sh->max_lun = HPSA_MAX_LUN;
>>>> sh->max_id = HPSA_MAX_LUN;
>>>> sh->can_queue = h->nr_cmds - HPSA_NRESERVED_CMDS;
>>>> + sh->nr_reserved_cmds = HPSA_NRESERVED_CMDS;
>>> Now .nr_reserved_cmds has been passed to blk-mq, you need to increase
>>> sh->can_queue to h->nr_cmds, because .can_queue is the whole queue depth
>>> (include the part of reserved tags), otherwise, IO tags will be
>>> decreased.
>>>
>>
>> Sounds correct.
>>
> I will have having a look at the patchset; I thought I did a patch to
> modify .can_queue so that it would cover only the usable tags, not the
> reserved ones.
>
To me, it makes sense to leave .can_queue unmodified, carry it down to
blk-mq and allow blk_mq_init_bitmap_tags() find the queue depth:
static struct blk_mq_tags *blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
int node, int alloc_policy)
{
unsigned int depth = tags->nr_tags - tags->nr_reserved_tags; *
bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
if (bt_alloc(&tags->bitmap_tags, depth, round_robin, node))
goto free_tags;
Cheers,
John
WARNING: multiple messages have this Message-ID (diff)
From: John Garry <john.garry@huawei.com>
To: Hannes Reinecke <hare@suse.de>, Ming Lei <ming.lei@redhat.com>
Cc: axboe@kernel.dk, jejb@linux.ibm.com, martin.petersen@oracle.com,
bvanassche@acm.org, hch@infradead.org,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-scsi@vger.kernel.org,
virtualization@lists.linux-foundation.org,
esc.storagedev@microsemi.com, chenxiang66@hisilicon.com,
Hannes Reinecke <hare@suse.com>
Subject: Re: [PATCH RFC v2 12/24] hpsa: use reserved commands
Date: Mon, 30 Mar 2020 14:42:45 +0100 [thread overview]
Message-ID: <c3f5c030-d735-c730-6ff9-19cb1cb50fe8@huawei.com> (raw)
In-Reply-To: <881b6a9b-2137-946f-a900-5c4e6cf1fe37@suse.de>
On 17/03/2020 09:48, Hannes Reinecke wrote:
> On 3/17/20 10:38 AM, John Garry wrote:
>> On 11/03/2020 08:10, Ming Lei wrote:
>>>> ands(struct ctlr_info *h)
>>>> @@ -5803,6 +5803,7 @@ static int hpsa_scsi_host_alloc(struct
>>>> ctlr_info *h)
>>>> sh->max_lun = HPSA_MAX_LUN;
>>>> sh->max_id = HPSA_MAX_LUN;
>>>> sh->can_queue = h->nr_cmds - HPSA_NRESERVED_CMDS;
>>>> + sh->nr_reserved_cmds = HPSA_NRESERVED_CMDS;
>>> Now .nr_reserved_cmds has been passed to blk-mq, you need to increase
>>> sh->can_queue to h->nr_cmds, because .can_queue is the whole queue depth
>>> (include the part of reserved tags), otherwise, IO tags will be
>>> decreased.
>>>
>>
>> Sounds correct.
>>
> I will have having a look at the patchset; I thought I did a patch to
> modify .can_queue so that it would cover only the usable tags, not the
> reserved ones.
>
To me, it makes sense to leave .can_queue unmodified, carry it down to
blk-mq and allow blk_mq_init_bitmap_tags() find the queue depth:
static struct blk_mq_tags *blk_mq_init_bitmap_tags(struct blk_mq_tags *tags,
int node, int alloc_policy)
{
unsigned int depth = tags->nr_tags - tags->nr_reserved_tags; *
bool round_robin = alloc_policy == BLK_TAG_ALLOC_RR;
if (bt_alloc(&tags->bitmap_tags, depth, round_robin, node))
goto free_tags;
Cheers,
John
next prev parent reply other threads:[~2020-03-30 13:43 UTC|newest]
Thread overview: 84+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-10 16:25 [PATCH RFC v2 00/24] scsi: enable reserved commands for LLDDs John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 01/24] scsi: add 'nr_reserved_cmds' field to the SCSI host template John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 23:08 ` Ming Lei
2020-03-11 6:55 ` Hannes Reinecke
2020-03-11 8:00 ` Ming Lei
2020-03-10 16:25 ` [PATCH RFC v2 02/24] scsi: allocate separate queue for reserved commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 18:32 ` Christoph Hellwig
2020-03-10 21:08 ` John Garry
2020-03-10 21:08 ` John Garry
2020-03-11 6:22 ` Christoph Hellwig
2020-03-11 6:58 ` Hannes Reinecke
2020-03-11 7:51 ` John Garry
2020-03-11 7:51 ` John Garry
2020-04-06 9:05 ` Hannes Reinecke
2020-04-07 11:54 ` John Garry
2020-04-07 11:54 ` John Garry
2020-04-07 14:00 ` Hannes Reinecke
2020-04-07 14:35 ` John Garry
2020-04-07 14:35 ` John Garry
2020-04-07 14:45 ` Hannes Reinecke
2020-04-07 15:19 ` John Garry
2020-04-07 15:19 ` John Garry
2020-04-07 16:30 ` Christoph Hellwig
2020-04-23 14:13 ` John Garry
2020-04-23 14:13 ` John Garry
2020-04-23 14:49 ` Hannes Reinecke
2020-04-23 15:33 ` John Garry
2020-04-23 15:33 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 03/24] blk-mq: Implement blk_mq_rq_is_reserved() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 04/24] scsi: Add scsi_{get, put}_reserved_cmd() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 05/24] csiostor: use reserved command for LUN reset John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 06/24] scsi: add scsi_cmd_from_priv() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 07/24] virtio_scsi: use reserved commands for TMF John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 08/24] scsi: add host tagset busy iterator John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 09/24] fnic: use reserved commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 10/24] fnic: use scsi_host_tagset_busy_iter() to traverse commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 11/24] hpsa: move hpsa_hba_inquiry after scsi_add_host() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 12/24] hpsa: use reserved commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-11 8:10 ` Ming Lei
2020-03-17 9:38 ` John Garry
2020-03-17 9:38 ` John Garry
2020-03-17 9:48 ` Hannes Reinecke
2020-03-30 13:42 ` John Garry [this message]
2020-03-30 13:42 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 13/24] hpsa: use blk_mq_tagset_busy_iter() to traverse outstanding commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 14/24] hpsa: drop refcount field from CommandList John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 15/24] snic: use reserved commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 16/24] snic: use tagset iter for traversing commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 17/24] aacraid: move scsi_add_host() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 18/24] aacraid: use private commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 19/24] aacraid: replace cmd_list with scsi_host_tagset_busy_iter() John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 20/24] aacraid: use scsi_host_tagset_busy_iter() to traverse outstanding commands John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 21/24] dpt_i2o: drop cmd_list usage John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 22/24] scsi: drop scsi command list John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 18:35 ` Christoph Hellwig
2020-03-10 20:47 ` John Garry
2020-03-10 20:47 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 23/24] scsi: libsas: aic94xx: hisi_sas: mvsas: pm8001: Allocate Scsi_cmd for slow task John Garry
2020-03-10 16:25 ` John Garry
2020-03-10 16:25 ` [PATCH RFC v2 24/24] scsi: hisi_sas: Use libsas slow task SCSI command John Garry
2020-03-10 16:25 ` John Garry
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