• Andrew Morton's avatar
    [PATCH] Replace the radix-tree rwlock with a spinlock · 8e98702b
    Andrew Morton authored
    Spinlocks don't have a buslocked unlock and are faster.
    
    On a P4, time to write a 4M file with 4M one-byte-write()s:
    
    Before:
    	0.72s user 5.47s system 99% cpu 6.227 total
    	0.76s user 5.40s system 100% cpu 6.154 total
    	0.77s user 5.38s system 100% cpu 6.146 total
    
    After:
    	1.09s user 4.92s system 99% cpu 6.014 total
    	0.74s user 5.28s system 99% cpu 6.023 total
    	1.03s user 4.97s system 100% cpu 5.991 total
    8e98702b
truncate.c 7.47 KB