On (01/22/17 10:58), zhouxianrong wrote: > 1. memset is just set a int value but i want to set a long value. ah... ok. because you union it with the handle. > 2. using clear_page rather than memset MAYBE due to in arm64 arch > it is a 64-bytes operations. clear_page() basically does memset(), which is quite well optimized. except for arm64, yes. > 6.6.4. Data Cache Zero > > The ARMv8-A architecture introduces a Data Cache Zero by Virtual Address (DC ZVA) instruction. This enables a block of 64 > bytes in memory, aligned to 64 bytes in size, to be set to zero. If the DC ZVA instruction misses in the cache, it clears main > memory, without causing an L1 or L2 cache allocation. > > but i only consider the arm64 arch, other archs need to be reviewed. thaks for the reply. -ss -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
