Messages in this thread | | | From | Chao Yu <> | Subject | RE: [f2fs-dev] [PATCH] f2fs: optimize __find_rev_next_bit | Date | Thu, 12 Nov 2015 18:36:29 +0800 |
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Hi Fan,
> -----Original Message----- > From: Fan Li [mailto:fanofcode.li@samsung.com] > Sent: Thursday, November 12, 2015 8:43 AM > To: 'Jaegeuk Kim' > Cc: linux-kernel@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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