linux-kernel - Re: [PATCH 4/7] page-writeback: pass in '0' for nr

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Message-ID: <20170921145929.GD8839@infradead.org>
Date:   Thu, 21 Sep 2017 07:59:30 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, hannes@...xchg.org, clm@...com, jack@...e.cz
Subject: Re: [PATCH 4/7] page-writeback: pass in '0' for nr_pages writeback
 in laptop mode

On Wed, Sep 20, 2017 at 09:32:59AM -0600, Jens Axboe wrote:
> Laptop mode really wants to writeback the number of dirty
> pages and inodes. Instead of calculating this in the caller,
> just pass in 0 and let wakeup_flusher_threads() handle it.
> 
> Use the new wakeup_flusher_threads_bdi() instead of rolling
> our own. This changes the writeback to not be range cyclic,
> but that should not matter for laptop mode flush-all
> semantics.

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>

While we're at sorting out the laptop_mode_wb_timer mess:
can we move initializing and deleting it from the block code
to the backing-dev code given that it now doesn't assume anything
about block devices any more?