On Tue, Jan 27, 2015 at 09:53:50AM -0700, Ross Zwisler wrote: > Add support for the new pcommit (persistent commit) 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 pcommit instruction ensures that data that has been flushed from the > processor's cache hierarchy with clwb, clflushopt or clflush is accepted to > memory and is durable on the DIMM. The primary use case for this is > persistent > memory. > > This function shows how to properly use clwb/clflushopt/clflush and > pcommit with appropriate fencing:
... > This is still correct, but now you've got two fences separated by only a > nop. With the commit and the fence together in pcommit_sfence() you > avoid the final unneeded fence. > > Signed-off-by: Ross Zwisler <[email protected]> > Cc: H Peter Anvin <[email protected]> > Cc: Ingo Molnar <[email protected]> > Cc: Thomas Gleixner <[email protected]> > Cc: Borislav Petkov <[email protected]> Acked-by: Borislav Petkov <[email protected]> -- Regards/Gruss, Boris. ECO tip #101: Trim your mails when you reply. -- -- 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/
