(2013/04/11 12:53), Simon Jeons wrote: > One question against mce instead of the patchset. ;-) > > When check memory is bad? Before memory access? Is there a process scan it period? Hi Simon-san, Yes, there is a process to scan memory periodically. At Intel Nehalem-EX and CPUs after Nehalem-EX generation, MCA recovery is supported. MCA recovery provides error detection and isolation features to work together with OS. One of the MCA Recovery features is Memory Scrubbing. It periodically checks memory in the background of OS. If Memory Scrubbing find an uncorrectable error on a memory before OS accesses the memory bit, MCA recovery notifies SRAO error into OS and OS handles the SRAO error using hwpoison function. Regards, Mitsuhiro Tanino -- 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>