admin-guide/mm/zswap.rst

10 dynamically allocated RAM-based memory pool.  zswap basically trades CPU cycles
11 for potentially reduced swap I/O.  This trade-off can also result in a
21   throttling by the hypervisor. This allows more work to get done with less
24   drastically reducing life-shortening writes.
69 means the compression ratio will always be 2:1 or worse (because of half-full
76 with a red-black tree per swap type.  The swap offset is the search key for the
90 * max_pool_percent - The maximum percentage of memory that the compressed
101 When the zpool and/or compressor parameter is changed at runtime, any existing
107 Some of the pages in zswap are same-value filled pages (i.e. contents of the
108 page have same value or repetitive pattern). These pages include zero-filled
110 checked if it is a same-value filled page before compressing it. If true, the
111 compressed length of the page is set to zero and the pattern or same-filled
117 special parameter has been introduced to implement a sort of hysteresis to
125 Setting this parameter to 100 will disable the hysteresis.
129 zswap itself) on a cgroup-basis as follows::
131 	echo 0 > /sys/fs/cgroup/<cgroup-name>/memory.zswap.writeback
148 of pages stored, same-value filled pages and various counters for the reasons