On Fri, 12 Nov 2010, Richard Kennedy wrote: > Add a slub sysfs entry to show the calculated number of fallback slabs. > > Using the information already available it is straightforward to > calculate the number of fallback & full size slabs. We can then track > which slabs are particularly effected by memory fragmentation and how > long they take to recover. > > There is no change to the mainline code, the calculation is only > performed on request, and the value is available without having to > enable CONFIG_SLUB_STATS. > I don't see why this information is generally useful unless debugging an issue where statistics are already needed such as ALLOC_SLOWPATH and ALLOC_SLAB, so it CONFIG_SLUB_STATS can be enabled to also track ORDER_FALLBACK. All stats can be cleared by writing a '0' to its sysfs stats file so you can collect statistics for various workloads without rebooting (after doing a forced shrink, for example). -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom policy in Canada: sign http://dissolvethecrtc.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>