zram: Compressed RAM based block devices ---------------------------------------- * Introduction The zram module creates RAM based block devices named /dev/zram ( = 0, 1, ...). Pages written to these disks are compressed and stored in memory itself. These disks allow very fast I/O and compression provides good amounts of memory savings. Some of the usecases include /tmp storage, use as swap disks, various caches under /var and maybe many more :) Statistics for individual zram devices are exported through sysfs nodes at /sys/block/zram/ Kconfig required: CONFIG_ZRAM=y CONFIG_CRYPTO_LZ4=y CONFIG_ZPOOL=y CONFIG_ZSMALLOC=y ZRAM Testcases -------------- zram_lib.sh: create library with initialization/cleanup functions zram.sh: For sanity check of CONFIG_ZRAM and to run zram01 and zram02 Two functional tests: zram01 and zram02: zram01.sh: creates general purpose ram disks with ext4 filesystems zram02.sh: creates block device for swap Commands required for testing: - bc - dd - free - awk - mkswap - swapon - swapoff - mkfs/ mkfs.ext4 For more information please refer: kernel-source-tree/Documentation/blockdev/zram.txt e='master'>master net-next plumbingsTobias Klauser
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authorMarkus Mayer <mmayer@broadcom.com>2016-12-19 12:10:27 -0800
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2017-01-27 11:43:48 +0100
commit9b02c54bc951fca884ba5719f42a27e8240965bf (patch)
tree68292e54c6d3482d6b55fc31b3ab9519307b255a /tools/perf/tests/sdt.c
parent7a308bb3016f57e5be11a677d15b821536419d36 (diff)
cpufreq: brcmstb-avs-cpufreq: extend sysfs entry brcm_avs_pmap
We extend the brcm_avs_pmap sysfs entry (which issues the GET_PMAP command to AVS) to include all fields from struct pmap. This means adding mode (AVS, DVS, DVFS) and state (the P-state) to the output. Signed-off-by: Markus Mayer <mmayer@broadcom.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/perf/tests/sdt.c')