include/asm-generic/bitops/sched.h says /* * Every architecture must define this function. It's the fastest * way of searching a 100-bit bitmap. It's guaranteed that at least * one of the 100 bits is cleared. */ arch/alpha/include/asm/bitops.h says /* * Every architecture must define this function. It's the fastest * way of searching a 140-bit bitmap where the first 100 bits are * unlikely to be set. It's guaranteed that at least one of the 140 * bits is set. */ Is the guarantee that one of the first 100-bits set (and that the last 40 are useless?), or 140-bits? If it's just the first 100 bits we care about, then the alpha version needs to be fixed. I'm just checking this out, because gcc produces horrendous code for sched_find_first_bit on alpha. I rewrote it in assembly and it's better than 4 times faster. Also, is it even worth optimizing that function? It looks like it's only used in kernel/sched_rt.c. Thanks, Matt -- To unsubscribe from this list: send the line "unsubscribe linux-alpha" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
