Messages in this thread | | | Subject | Re: [PATCH] Add memcpy_nc, a copy routine that tries to keep cache pressure down | From | Arjan van de Ven <> | Date | Sat, 01 Jul 2006 10:27:34 +0200 |
| |
On Fri, 2006-06-30 at 21:56 -0700, Bryan O'Sullivan wrote: > This copy routine is memcpy-compatible, but on some architectures will use > cache-bypassing loads to avoid bringing the source data into the cache. > > One case where this is useful is when a device issues a DMA to a memory > region, and the CPU must copy the DMAed data elsewhere before doing any > work with it. Since the source data is read-once, write-never from the > CPU's perspective, caching those addresses can only evict potentially > useful data. > > We provide an x86_64 implementation that uses SSE non-temporal loads, > and a generic version that falls back to plain memcpy.
Hi,
can we give this a more descriptive name please? Say memcpy_cachebypass() or something? "_nc" doesn't say a lot of things to many people... which means it'll either not get used when it should, or it gets used when it shouldn't....
Greetings, Arjan van de Ven
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |