1*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/disksize 2*e98419c2SNitin GuptaDate: August 2010 3*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 4*e98419c2SNitin GuptaDescription: 5*e98419c2SNitin Gupta The disksize file is read-write and specifies the disk size 6*e98419c2SNitin Gupta which represents the limit on the *uncompressed* worth of data 7*e98419c2SNitin Gupta that can be stored in this disk. 8*e98419c2SNitin Gupta 9*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/initstate 10*e98419c2SNitin GuptaDate: August 2010 11*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 12*e98419c2SNitin GuptaDescription: 13*e98419c2SNitin Gupta The disksize file is read-only and shows the initialization 14*e98419c2SNitin Gupta state of the device. 15*e98419c2SNitin Gupta 16*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/reset 17*e98419c2SNitin GuptaDate: August 2010 18*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 19*e98419c2SNitin GuptaDescription: 20*e98419c2SNitin Gupta The disksize file is write-only and allows resetting the 21*e98419c2SNitin Gupta device. The reset operation frees all the memory assocaited 22*e98419c2SNitin Gupta with this device. 23*e98419c2SNitin Gupta 24*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/num_reads 25*e98419c2SNitin GuptaDate: August 2010 26*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 27*e98419c2SNitin GuptaDescription: 28*e98419c2SNitin Gupta The num_reads file is read-only and specifies the number of 29*e98419c2SNitin Gupta reads (failed or successful) done on this device. 30*e98419c2SNitin Gupta 31*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/num_writes 32*e98419c2SNitin GuptaDate: August 2010 33*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 34*e98419c2SNitin GuptaDescription: 35*e98419c2SNitin Gupta The num_writes file is read-only and specifies the number of 36*e98419c2SNitin Gupta writes (failed or successful) done on this device. 37*e98419c2SNitin Gupta 38*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/invalid_io 39*e98419c2SNitin GuptaDate: August 2010 40*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 41*e98419c2SNitin GuptaDescription: 42*e98419c2SNitin Gupta The invalid_io file is read-only and specifies the number of 43*e98419c2SNitin Gupta non-page-size-aligned I/O requests issued to this device. 44*e98419c2SNitin Gupta 45*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/notify_free 46*e98419c2SNitin GuptaDate: August 2010 47*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 48*e98419c2SNitin GuptaDescription: 49*e98419c2SNitin Gupta The notify_free file is read-only and specifies the number of 50*e98419c2SNitin Gupta swap slot free notifications received by this device. These 51*e98419c2SNitin Gupta notifications are send to a swap block device when a swap slot 52*e98419c2SNitin Gupta is freed. This statistic is applicable only when this disk is 53*e98419c2SNitin Gupta being used as a swap disk. 54*e98419c2SNitin Gupta 55*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/discard 56*e98419c2SNitin GuptaDate: August 2010 57*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 58*e98419c2SNitin GuptaDescription: 59*e98419c2SNitin Gupta The discard file is read-only and specifies the number of 60*e98419c2SNitin Gupta discard requests received by this device. These requests 61*e98419c2SNitin Gupta provide information to block device regarding blocks which are 62*e98419c2SNitin Gupta no longer used by filesystem. 63*e98419c2SNitin Gupta 64*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/zero_pages 65*e98419c2SNitin GuptaDate: August 2010 66*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 67*e98419c2SNitin GuptaDescription: 68*e98419c2SNitin Gupta The zero_pages file is read-only and specifies number of zero 69*e98419c2SNitin Gupta filled pages written to this disk. No memory is allocated for 70*e98419c2SNitin Gupta such pages. 71*e98419c2SNitin Gupta 72*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/orig_data_size 73*e98419c2SNitin GuptaDate: August 2010 74*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 75*e98419c2SNitin GuptaDescription: 76*e98419c2SNitin Gupta The orig_data_size file is read-only and specifies uncompressed 77*e98419c2SNitin Gupta size of data stored in this disk. This excludes zero-filled 78*e98419c2SNitin Gupta pages (zero_pages) since no memory is allocated for them. 79*e98419c2SNitin Gupta Unit: bytes 80*e98419c2SNitin Gupta 81*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/compr_data_size 82*e98419c2SNitin GuptaDate: August 2010 83*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 84*e98419c2SNitin GuptaDescription: 85*e98419c2SNitin Gupta The compr_data_size file is read-only and specifies compressed 86*e98419c2SNitin Gupta size of data stored in this disk. So, compression ratio can be 87*e98419c2SNitin Gupta calculated using orig_data_size and this statistic. 88*e98419c2SNitin Gupta Unit: bytes 89*e98419c2SNitin Gupta 90*e98419c2SNitin GuptaWhat: /sys/block/zram<id>/mem_used_total 91*e98419c2SNitin GuptaDate: August 2010 92*e98419c2SNitin GuptaContact: Nitin Gupta <ngupta@vflare.org> 93*e98419c2SNitin GuptaDescription: 94*e98419c2SNitin Gupta The mem_used_total file is read-only and specifies the amount 95*e98419c2SNitin Gupta of memory, including allocator fragmentation and metadata 96*e98419c2SNitin Gupta overhead, allocated for this disk. So, allocator space 97*e98419c2SNitin Gupta efficiency can be calculated using compr_data_size and this 98*e98419c2SNitin Gupta statistic. 99*e98419c2SNitin Gupta Unit: bytes