diff options
| author | Vitaly Wool <vitaly.wool@konsulko.com> | 2020-01-30 22:15:04 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-31 10:30:39 -0800 |
| commit | 45190f01dd402112d3d22c0ddc4152994f9e1e55 (patch) | |
| tree | d707c75e478a464d43095393197140a587b88c99 /Documentation/vm | |
| parent | 3d680bdf60a5bade3e8cbd049927e7f8b1d3fe97 (diff) | |
mm/zswap.c: add allocation hysteresis if pool limit is hit
zswap will always try to shrink pool when zswap is full. If there is a
high pressure on zswap it will result in flipping pages in and out zswap
pool without any real benefit, and the overall system performance will
drop. The previous discussion on this subject [1] ended up with a
suggestion to implement a sort of hysteresis to refuse taking pages into
zswap pool until it has sufficient space if the limit has been hit.
This is my take on this.
Hysteresis is controlled with a sysfs-configurable parameter (namely,
/sys/kernel/debug/zswap/accept_threhsold_percent). It specifies the
threshold at which zswap would start accepting pages again after it
became full. Setting this parameter to 100 disables the hysteresis and
sets the zswap behavior to pre-hysteresis state.
[1] https://lkml.org/lkml/2019/11/8/949
Link: http://lkml.kernel.org/r/20200108200118.15563-1-vitaly.wool@konsulko.com
Signed-off-by: Vitaly Wool <vitaly.wool@konsulko.com>
Cc: Dan Streetman <ddstreet@ieee.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/vm')
| -rw-r--r-- | Documentation/vm/zswap.rst | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/vm/zswap.rst b/Documentation/vm/zswap.rst index 1444ecd40911..61f6185188cd 100644 --- a/Documentation/vm/zswap.rst +++ b/Documentation/vm/zswap.rst @@ -130,6 +130,19 @@ checking for the same-value filled pages during store operation. However, the existing pages which are marked as same-value filled pages remain stored unchanged in zswap until they are either loaded or invalidated. +To prevent zswap from shrinking pool when zswap is full and there's a high +pressure on swap (this will result in flipping pages in and out zswap pool +without any real benefit but with a performance drop for the system), a +special parameter has been introduced to implement a sort of hysteresis to +refuse taking pages into zswap pool until it has sufficient space if the limit +has been hit. To set the threshold at which zswap would start accepting pages +again after it became full, use the sysfs ``accept_threhsold_percent`` +attribute, e. g.:: + + echo 80 > /sys/module/zswap/parameters/accept_threhsold_percent + +Setting this parameter to 100 will disable the hysteresis. + A debugfs interface is provided for various statistic about pool size, number of pages stored, same-value filled pages and various counters for the reasons pages are rejected. |