On (09/14/15 15:49), Vitaly Wool wrote: > While using ZRAM on a small RAM footprint devices, together with KSM, > I ran into several occasions when moving pages from compressed swap back > into the "normal" part of RAM caused significant latencies in system operation. > By using zbud I lose in compression ratio but gain in determinism, lower > latencies and lower fragmentation, so in the coming patches I tried to > generalize what I've done to enable zbud for zram so far. > do you have CONFIG_PGTABLE_MAPPING enabled or disabled? or kmap_atomic/memcpy/kunmap_atomic is not the root cause here? can you provide more details please? -ss -- 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>