linux-kernel - Re: [PATCH v1 2/6] fs: use on-stack-bio if backing device has BDI_CAP

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Date:   Mon, 14 Aug 2017 09:38:06 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     Minchan Kim <minchan@...nel.org>
Cc:     Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        "karam . lee" <karam.lee@....com>, seungho1.park@....com,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
        kernel-team <kernel-team@....com>
Subject: Re: [PATCH v1 2/6] fs: use on-stack-bio if backing device has
 BDI_CAP_SYNC capability

On 08/14/2017 09:31 AM, Minchan Kim wrote:
>> Secondly, generally you don't have slow devices and fast devices
>> intermingled when running workloads. That's the rare case.
> 
> Not true. zRam is really popular swap for embedded devices where
> one of low cost product has a really poor slow nand compared to
> lz4/lzo [de]comression.

I guess that's true for some cases. But as I said earlier, the recycling
really doesn't care about this at all. They can happily coexist, and not
step on each others toes.

-- 
Jens Axboe