linux-kernel - Re: [RFC PATCH v2 0/2] add simple copy support

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Date:   Wed, 16 Dec 2020 00:45:59 +0100
From:   Pavel Machek <pavel@....cz>
To:     Johannes Thumshirn <Johannes.Thumshirn@....com>
Cc:     Javier González <javier@...igon.com>,
        Hannes Reinecke <hare@...e.de>, Christoph Hellwig <hch@....de>,
        SelvaKumar S <selvakuma.s1@...sung.com>,
        "linux-nvme@...ts.infradead.org" <linux-nvme@...ts.infradead.org>,
        "kbusch@...nel.org" <kbusch@...nel.org>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "sagi@...mberg.me" <sagi@...mberg.me>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "dm-devel@...hat.com" <dm-devel@...hat.com>,
        "snitzer@...hat.com" <snitzer@...hat.com>,
        "selvajove@...il.com" <selvajove@...il.com>,
        "nj.shetty@...sung.com" <nj.shetty@...sung.com>,
        "joshi.k@...sung.com" <joshi.k@...sung.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Bart Van Assche <bvanassche@....org>,
        Mikulas Patocka <mpatocka@...hat.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>
Subject: Re: [RFC PATCH v2 0/2] add simple copy support

Hi!

> > Good idea. Are you thinking of a sysfs entry to select the backend?
> 
> Not sure on this one, initially I thought of a sysfs file, but then
> how would you do it. One "global" sysfs entry is probably a bad idea.
> Having one per block device to select native vs emulation maybe? And
> a good way to benchmark.
> 
> The other idea would be a benchmark loop on boot like the raid library
> does.

Doing copy benchmarking would require writes on the media, right?

Kernel should not do such stuff without userspace requesting it...

Best regards,
								Pavel
-- 
http://www.livejournal.com/~pavelmachek

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