linux-kernel - Re: [PATCH] loop: Add PF_LESS_THROTTLE to block/loop device thread.

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Message-ID: <8760ijiind.fsf@notabene.neil.brown.name>
Date:   Wed, 05 Apr 2017 14:27:02 +1000
From:   NeilBrown <neilb@...e.com>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Jens Axboe <axboe@...com>, linux-block@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] loop: Add PF_LESS_THROTTLE to block/loop device thread.

On Tue, Apr 04 2017, Christoph Hellwig wrote:

> Looks fine,
>
> Reviewed-by: Christoph Hellwig <hch@....de>
>
> But if you actually care about performance in any way I'd suggest
> to use the loop device in direct I/O mode..

The losetup on my test VM is too old to support that :-(
I guess it might be time to upgraded.

It seems that there is not "mount -o direct_loop" or similar, so you
have to do the losetup and the mount separately.  Any thoughts on
whether that should be changed ?

Thanks,
NeilBrown

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