Hi Fan,
> -----Original Message-----
> From: Fan Li [mailto:fanofcode...@samsung.com]
> Sent: Thursday, November 12, 2015 8:43 AM
> To: 'Jaegeuk Kim'
> Cc: linux-ker...@vger.kernel.org; linux-f2fs-devel@lists.sourceforge.net
> Subject: [f2fs-dev] [PATCH] f2fs: optimize __find_rev_next_bit
>
> 1. Skip __reverse_ulong if the bitmap is empty.
> 2. Reduce branches and codes.
> According to my test, the performance of this new version is 5% higher on
> an empty bitmap of 64bytes, and remains about the same in the worst scenario.
Good catch!
IMO, it's better to optimize __find_rev_next_{,zero}bit together. :)
Thanks,
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