Hi Fan, > -----Original Message----- > From: Fan Li [mailto:fanofcode...@samsung.com] > Sent: Thursday, November 12, 2015 8:43 AM > To: 'Jaegeuk Kim' > Cc: linux-kernel@vger.kernel.org; linux-f2fs-de...@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, -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/