On Tue 28-11-17 09:49:45, Jiang Biao wrote: > 1. Use unlikely to try to improve branch prediction. The > *total_scan < 0* branch is unlikely to reach, so use unlikely. > > 2. Optimize *next_deferred >= scanned* condition. > *next_deferred >= scanned* condition could be optimized into > *next_deferred > scanned*, because when *next_deferred == scanned*, > next_deferred shoud be 0, which is covered by the else branch. > > 3. Merge two branch blocks into one. The *next_deferred > 0* branch > could be merged into *next_deferred > scanned* to simplify the code.
How have you measured benefit of this patch? -- Michal Hocko SUSE Labs
