Hi list! I'm wondering about the usage of frontswap and cleancache. Now that all pieces are in place in kernel-3.5, is it actually used?
I've found references to cleancache and frontswap in several source files of the kernel (ext4, swapfile, page_io, ...). /sys/kernel/mm/zcache is also present but seems to indicate no usage at all. Content attached below. So, what is the state of all this? Should it work? Does it work? Am I missing a kernel parameter or something? Content of /sys/kernel/mm/zcache: compress_poor: 0 curr_obj_count: 0 curr_obj_count_max: 0 curr_objnode_count: 0 curr_objnode_count_max: 0 evicted_buddied_pages: 0 evicted_raw_pages: 0 evicted_unbuddied_pages: 0 failed_alloc: 0 failed_eph_puts: 0 failed_get_free_pages: 0 failed_pers_puts: 0 flobj_found: 0 flobj_total: 0 flush_found: 0 flush_total: 0 mean_compress_poor: 0 put_to_flush: 0 zbpg_unused_list_count: 0 zbud_buddied_count: 0 zbud_cumul_chunk_counts: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 <=21:0 <=32:0 <=42:0, mean:0 zbud_cumul_zbytes: 0 zbud_cumul_zpages: 0 zbud_curr_raw_pages: 0 zbud_curr_zbytes: 0 zbud_curr_zpages: 0 zbud_unbuddied_list_counts: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 zv_cumul_dist_counts: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 mean:0 zv_curr_dist_counts: 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 mean:0 zv_max_mean_zsize: 2560 zv_max_zsize: 3584 zv_page_count_policy_percent: 75 Thanks in advance, Florian Philipp
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