The required BusyBox applets are enabled by default, so we can rely on them
being present in the system. This way, we make sure there are no conflicts
with less featured variants of these same applets which might also be
present in the system.
Fixes: 0bd7dfa3ed ("zram-swap: enable swap discard")
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
[wrap commit description]
Signed-off-by: David Bauer <mail@david-bauer.net>
On devices with small amounts of RAM, zram-swap fails to initialise due to the
default compression algorithm (lzo-rle). Startup example on an AirGrid M2, with
32 MiB of RAM:
root@airgrid:/etc/config# /etc/init.d/zram start
zram_start: activating '/dev/zram0' for swapping (13 MegaBytes)
zram_reset: enforcing defaults via /sys/block/zram0/reset
sh: write error: Out of memory
mkswap: image is too small
swapon: /dev/zram0: Invalid argument
root@airgrid:/etc/config#
Fix this by defaulting to traditional lzo, which works fine and is always
available.
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
Fix shellcheck SC2230
> which is non-standard. Use builtin 'command -v' instead.
Using `command -v` is POSIX compliant while `which` is not. Also to
mention, `command -v` is a shell builtin whereas `which` is a separate
busybox applet.
Once applied to everything concerning OpenWrt we can disable the busybox
feature `which` and save 3.8kB.
Acked-by: Stijn Tintel <stijn@linux-ipv6.be>
Signed-off-by: Paul Spooren <mail@aparcar.org>
[also replace cases in zram-swap]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
This replaces deprecated backticks by more versatile $(...) syntax.
Signed-off-by: Rui Salvaterra <rsalvaterra@gmail.com>
[add commit description]
Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>
If zram-backed swap is added after an existing swap, it gets a lower
priority. Assiming that usually all other swaps are slower, there should
be a way to assign a higher priority to zram swap.
Signed-off-by: Maxim Storchak <m.storchak@gmail.com>
This patch adds two new commands:
zram status - shows memory stats for all zram swaps
zram compaction - trigger compaction for all zram swaps
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
Executing '/etc/init.d/zram start' during runtime (with a swap being already
mounted) triggers zram device compaction and prints out nice stats info about
zram memory usage
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> [use IEC's MiB unit]
Config option to limit maximum compression streams per zram dev for
multicore CPU's. This could be defined via 'zram_comp_streams' option in
the 'system' section of '/etc/config/system' file or via cli (for e.x.
with 'uci set system.@System[0].zram_comp_streams=2 && uci commit
system'). Default is number of logical CPU cores.
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Use only one zram swap device of the specified $size instead of
[N x $size] devices for multicore CPUs Now zram module uses multiple
compression streams for each dev by default, so we do not need to create
several zram devs to utilize multicore CPUs.
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
* "zram stop" could reset up to $(num_of_cores) zram devices even if
some of those were not mounted as swap dev's. This fix tries to
enumerate mounted swap zram dev's before making a reset
* remove hot-added zram devs on stop (except zram0)
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Compression algorithms for zram are provided by kernel crypto API, could
be any of [lzo|zl4|deflate|<some_more>] depending on kernel modules.
Compress algo for zram-swap could be defined via 'zram_comp_algo' option
in 'system' section of '/etc/config/system' file, or via cli (for e.x.
with 'uci set system.@System[0].zram_comp_algo=lz4 && uci commit
system'). check available algo's via 'cat /sys/block/zram0
/comp_algorithm'
Signed-off-by: Emil Muratov <gpm@hotplug.ru>
Enable CONFIG_PROCD_ZRAM_TMPFS compatibility via two changes to list_cpu_idx():
* detect if /tmp is being used by /dev/zram0; if yes, offset initial value by 1 to skip first zram device.
* hot-add /dev/zram1, if not already present.
Signed-off-by: Conn O'Griofa >connogriofa@gmail.com>
