On 01/27/2015 08:53 AM, Ross Zwisler wrote: > Add support for the new clwb (cache line write back) instruction. This > instruction was announced in the document "Intel Architecture > Instruction Set Extensions Programming Reference" with reference number > 319433-022. > > https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf > > The clwb instruction is used to write back the contents of dirtied cache > lines to memory without evicting the cache lines from the processor's > cache hierarchy. This should be used in favor of clflushopt or clflush > in cases where you require the cache line to be written to memory but > plan to access the data again in the near future. > > One of the main use cases for this is with persistent memory where clwb > can be used with pcommit to ensure that data has been accepted to memory > and is durable on the DIMM.
Acked-by: H. Peter Anvin <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
