linux-kernel - Re: Regarding patch "block/blk-mq: Don't complete locally if capacities are different"

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Message-ID: <a93c34a9-7fcf-4bb9-9c67-20202e2f6e59@arm.com>
Date: Mon, 26 Aug 2024 18:32:10 +0100
From: Christian Loehle <christian.loehle@....com>
To: Bart Van Assche <bvanassche@....org>,
 MANISH PANDEY <quic_mapa@...cinc.com>, Sandeep Dhavale <dhavale@...gle.com>,
 Dietmar Eggemann <dietmar.eggemann@....com>
Cc: Qais Yousef <qyousef@...alina.io>, axboe@...nel.dk, mingo@...nel.org,
 peterz@...radead.org, vincent.guittot@...aro.org,
 linux-block@...r.kernel.org, sudeep.holla@....com,
 Jaegeuk Kim <jaegeuk@...nel.org>, Christoph Hellwig <hch@...radead.org>,
 kailash@...gle.com, tkjos@...gle.com, bvanassche@...gle.com,
 quic_nitirawa@...cinc.com, quic_cang@...cinc.com, quic_rampraka@...cinc.com,
 quic_narepall@...cinc.com,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: Regarding patch "block/blk-mq: Don't complete locally if
 capacities are different"

On 8/23/24 15:12, Bart Van Assche wrote:
> On 8/23/24 6:49 AM, MANISH PANDEY wrote:
>> while making the patch, i figured out that queue_flags is unsigned long type and we already reached up to 32 flags as of now.
> 
> Really? In Linus' master branch I see 13 queue flags. This is less than
> half of 32. From include/linux/blkdev.h:

@Manish:
See recent (6.11) cleanup
https://lore.kernel.org/linux-block/20240719112912.3830443-1-john.g.garry@oracle.com/

> 
> enum {
>     QUEUE_FLAG_DYING,        /* queue being torn down */
>     QUEUE_FLAG_NOMERGES,        /* disable merge attempts */
>     QUEUE_FLAG_SAME_COMP,        /* complete on same CPU-group */
>     QUEUE_FLAG_FAIL_IO,        /* fake timeout */
>     QUEUE_FLAG_NOXMERGES,        /* No extended merges */
>     QUEUE_FLAG_SAME_FORCE,        /* force complete on same CPU */
>     QUEUE_FLAG_INIT_DONE,        /* queue is initialized */
>     QUEUE_FLAG_STATS,        /* track IO start and completion times */
>     QUEUE_FLAG_REGISTERED,        /* queue has been registered to a disk */
>     QUEUE_FLAG_QUIESCED,        /* queue has been quiesced */
>     QUEUE_FLAG_RQ_ALLOC_TIME,    /* record rq->alloc_time_ns */
>     QUEUE_FLAG_HCTX_ACTIVE,        /* at least one blk-mq hctx is active */
>     QUEUE_FLAG_SQ_SCHED,        /* single queue style io dispatch */
>     QUEUE_FLAG_MAX
> };
> 
> Bart.
>