Eric Lee / smarc-fsl-linux-kernel

01 Jun, 2020

1 commit

  • 9469b3907   zswap: docs/vm: Fix typo accept_threshold_percent in zswap.rst ... Browse Code »

    Recently, I switched over from swap-file to zramswap.

    When reading the Documentation/vm/zswap.rst file I fell over this typo.

    The parameter is called accept_threshold_percent not accept_threhsold_percent
    in /sys/module/zswap/parameters/ directory.

    Fixes: 45190f01dd402 ("mm/zswap.c: add allocation hysteresis if pool limit is hit")
    Cc: Vitaly Wool
    Signed-off-by: Sedat Dilek
    Link: https://lore.kernel.org/r/20200601005911.31222-1-sedat.dilek@gmail.com
    Signed-off-by: Jonathan Corbet

    Sedat Dilek
     

08 Apr, 2020

1 commit

  • bb8b93b5b   mm/zswap: allow setting default status, compressor and allocator in Kconfig ... Browse Code »

    The compressed cache for swap pages (zswap) currently needs from 1 to 3
    extra kernel command line parameters in order to make it work: it has to
    be enabled by adding a "zswap.enabled=1" command line parameter and if one
    wants a different compressor or pool allocator than the default lzo / zbud
    combination then these choices also need to be specified on the kernel
    command line in additional parameters.

    Using a different compressor and allocator for zswap is actually pretty
    common as guides often recommend using the lz4 / z3fold pair instead of
    the default one. In such case it is also necessary to remember to enable
    the appropriate compression algorithm and pool allocator in the kernel
    config manually.

    Let's avoid the need for adding these kernel command line parameters and
    automatically pull in the dependencies for the selected compressor
    algorithm and pool allocator by adding an appropriate default switches to
    Kconfig.

    The default values for these options match what the code was using
    previously as its defaults.

    Signed-off-by: Maciej S. Szmigiero
    Signed-off-by: Andrew Morton
    Reviewed-by: Vitaly Wool
    Link: http://lkml.kernel.org/r/20200202000112.456103-1-mail@maciej.szmigiero.name
    Signed-off-by: Linus Torvalds

    Maciej S. Szmigiero
     

01 Feb, 2020

1 commit

  • 45190f01d   mm/zswap.c: add allocation hysteresis if pool limit is hit ... Browse Code »

    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
    Cc: Dan Streetman
    Signed-off-by: Andrew Morton
    Signed-off-by: Linus Torvalds

    Vitaly Wool
     

17 Apr, 2018

1 commit