linux-kernel - Re: [PATCH v5 6/7] null_blk: use zone_size_sects

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Message-ID: <20220523181122.3vjizmsx7a2mpf6z@garbanzo>
Date:   Mon, 23 May 2022 11:11:22 -0700
From:   Luis Chamberlain <mcgrof@...nel.org>
To:     Pankaj Raghav <p.raghav@...sung.com>
Cc:     axboe@...nel.dk, hch@....de, snitzer@...hat.com,
        damien.lemoal@...nsource.wdc.com, hare@...e.de,
        Johannes.Thumshirn@....com, linux-nvme@...ts.infradead.org,
        dm-devel@...hat.com, dsterba@...e.com, jiangbo.365@...edance.com,
        linux-kernel@...r.kernel.org, gost.dev@...sung.com,
        linux-block@...r.kernel.org, jaegeuk@...nel.org,
        Damien Le Moal <damien.lemoal@....com>
Subject: Re: [PATCH v5 6/7] null_blk: use zone_size_sects_shift for power of
 2 zoned devices

On Mon, May 23, 2022 at 06:16:00PM +0200, Pankaj Raghav wrote:
> Instead of doing is_power_of_2 and ilog2 operation for every IO, cache
> the zone_size_sects_shift variable and use it for power of 2 zoned
> devices.
> 
> This variable will be set to zero for non power of 2 zoned devices.
> 
> Suggested-by: Damien Le Moal <damien.lemoal@....com>
> Signed-off-by: Pankaj Raghav <p.raghav@...sung.com>

Reviewed-by: Luis Chamberlain <mcgrof@...nel.org>

  Luis