From: "axboe@kernel.dk" <axboe@kernel.dk>
To: Bart Van Assche <Bart.VanAssche@sandisk.com>
Cc: "hch@lst.de" <hch@lst.de>, "tj@kernel.org" <tj@kernel.org>,
"martin.petersen@oracle.com" <martin.petersen@oracle.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
"linux-ide@vger.kernel.org" <linux-ide@vger.kernel.org>
Subject: Re: [PATCH 1/7] ѕd: split sd_setup_discard_cmnd
Date: Tue, 28 Mar 2017 08:05:09 -0600 [thread overview]
Message-ID: <20170328140509.GA27578@kernel.dk> (raw)
In-Reply-To: <1490653474.7897.13.camel@sandisk.com>
On Mon, Mar 27 2017, Bart Van Assche wrote:
> On Mon, 2017-03-20 at 16:43 -0400, Christoph Hellwig wrote:
> > + u64 sector = blk_rq_pos(rq) >> (ilog2(sdp->sector_size) - 9);
> > + u32 nr_sectors = blk_rq_sectors(rq) >> (ilog2(sdp->sector_size) - 9);
>
> Although I know this is an issue in the existing code and not something
> introduced by you: please consider using logical_to_sectors() instead of
> open-coding this function. Otherwise this patch looks fine to me.
The downside of doing that is that we still call ilog2() twice, which
sucks. Would be faster to cache ilog2(sector_size) and use that in the
shift calculation.
--
Jens Axboe
next prev parent reply other threads:[~2017-03-28 14:05 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-03-20 20:43 support ranges TRIM for libata Christoph Hellwig
2017-03-20 20:43 ` [PATCH 1/7] ѕd: split sd_setup_discard_cmnd Christoph Hellwig
2017-03-27 22:24 ` Bart Van Assche
2017-03-28 14:05 ` axboe [this message]
2017-03-30 8:49 ` hch
2017-03-20 20:43 ` [PATCH 2/7] sd: provide a new ata trim provisioning mode Christoph Hellwig
2017-03-27 22:40 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 3/7] libata: remove SCT WRITE SAME support Christoph Hellwig
2017-03-20 20:43 ` [PATCH 4/7] libata: simplify the trim implementation Christoph Hellwig
2017-03-20 20:43 ` [PATCH 5/7] block: add a max_discard_segment_size queue limit Christoph Hellwig
2017-03-27 23:09 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 6/7] sd: support multi-range TRIM for ATA disks Christoph Hellwig
2017-03-27 23:38 ` Bart Van Assche
2017-03-20 20:43 ` [PATCH 7/7] sd: use ZERO_PAGE for WRITE_SAME payloads Christoph Hellwig
2017-03-27 23:40 ` Bart Van Assche
2017-03-21 18:59 ` support ranges TRIM for libata Tejun Heo
2017-03-22 18:19 ` Christoph Hellwig
2017-03-23 13:47 ` James Bottomley
2017-03-23 13:55 ` Christoph Hellwig
2017-03-23 14:35 ` James Bottomley
2017-03-23 14:43 ` Christoph Hellwig
2017-03-23 15:04 ` Tejun Heo
2017-03-23 15:27 ` Christoph Hellwig
2017-03-23 15:30 ` Christoph Hellwig
2017-03-23 15:39 ` Martin K. Petersen
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