linux-kernel - Re: [PATCH] sbitmap: Consider cleared bits in sbitmap_bitmap

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Message-ID: <122e0d4d-d9b2-a81e-b8ce-fa8636eabe1b@kernel.dk>
Date:   Wed, 1 Jul 2020 10:53:28 -0600
From:   Jens Axboe <axboe@...nel.dk>
To:     John Garry <john.garry@...wei.com>
Cc:     bvanassche@....org, osandov@...com, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, hare@...e.com
Subject: Re: [PATCH] sbitmap: Consider cleared bits in sbitmap_bitmap_show()

On 7/1/20 2:06 AM, John Garry wrote:
> sbitmap works by maintaining separate bitmaps of set and cleared bits.
> The set bits are cleared in a batch, to save the burden of continuously
> locking the "word" map to unset.
> 
> sbitmap_bitmap_show() only shows the set bits (in "word"), which is not
> too much use, so mask out the cleared bits.

Applied, thanks.

-- 
Jens Axboe