zram: Compressed RAM based block devices
----------------------------------------
* Introduction

The zram module creates RAM based block devices named /dev/zram<id>
(<id> = 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<id>/

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
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<tr><td class='sub'>net-next plumbings</td><td class='sub right'>Tobias Klauser</td></tr></table>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc/arc?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>arc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>timers.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='cc9b94029e9ef51787af908e9856b1eed314bc00'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-04 12:16:38 -0600</td></tr>
<tr><th>committer</th><td>Mark Brown &lt;broonie@kernel.org&gt;</td><td class='right'>2016-11-04 12:16:38 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>cc9b94029e9ef51787af908e9856b1eed314bc00</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>9675310b89d0f6fb1f7bd9423f0638c4ee5226fd</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>include/soc/arc/timers.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc/arc/timers.h?id=13bed58ce8748d430a26e353a09b89f9d613a71f'>13bed58ce8748d430a26e353a09b89f9d613a71f</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00&amp;id2=13bed58ce8748d430a26e353a09b89f9d613a71f'>diff</a>)</td></tr><tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc/arc/timers.h?id=1b5b42216469b05ef4b5916cb40b127dfab1da88'>1b5b42216469b05ef4b5916cb40b127dfab1da88</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/soc/arc/timers.h?id=cc9b94029e9ef51787af908e9856b1eed314bc00&amp;id2=1b5b42216469b05ef4b5916cb40b127dfab1da88'>diff</a>)</td></tr></table>
<div class='commit-subject'>Merge branch 'topic/error' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regulator into regulator-fixed</div><div class='commit-msg'></div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=cc9b94029e9ef51787af908e9856b1eed314bc00'>Diffstat</a> (limited to 'include/soc/arc/timers.h')</div><table summary='diffstat' class='diffstat'>