OpenWrt – Blame information for rev 3
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Rev | Author | Line No. | Line |
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1 | office | 1 | #!/bin/sh /etc/rc.common |
2 | |||
3 | START=15 |
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4 | |||
5 | ram_size() |
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6 | { |
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7 | local line |
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8 | |||
9 | while read line; do case "$line" in MemTotal:*) set $line; echo "$2"; break ;; esac; done </proc/meminfo |
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10 | } |
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11 | |||
12 | zram_size() # in megabytes |
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13 | { |
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14 | local zram_size="$( uci -q get system.@system[0].zram_size_mb )" |
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15 | local ram_size="$( ram_size )" |
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16 | |||
17 | if [ -z "$zram_size" ]; then |
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18 | # e.g. 6mb for 16mb-routers or 61mb for 128mb-routers |
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3 | office | 19 | echo $(( $ram_size / 2048 )) |
1 | office | 20 | else |
21 | echo "$zram_size" |
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22 | fi |
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23 | } |
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24 | |||
25 | zram_applicable() |
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26 | { |
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27 | local zram_dev="$1" |
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28 | |||
3 | office | 29 | grep -sq ^"$zram_dev " /proc/swaps && { |
30 | logger -s -t zram_applicable -p daemon.notice "[OK] '$zram_dev' already active" |
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31 | return 1 |
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32 | } |
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33 | |||
1 | office | 34 | [ -e "$zram_dev" ] || { |
35 | logger -s -t zram_applicable -p daemon.crit "[ERROR] device '$zram_dev' not found" |
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36 | return 1 |
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37 | } |
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38 | |||
39 | which mkswap >/dev/null || { |
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40 | logger -s -t zram_applicable -p daemon.err "[ERROR] 'mkswap' not installed" |
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41 | return 1 |
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42 | } |
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43 | |||
44 | which swapon >/dev/null || { |
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45 | logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapon' not installed" |
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46 | return 1 |
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47 | } |
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48 | |||
49 | which swapoff >/dev/null || { |
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50 | logger -s -t zram_applicable -p daemon.err "[ERROR] 'swapoff' not installed" |
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51 | return 1 |
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52 | } |
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53 | } |
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54 | |||
55 | zram_dev() |
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56 | { |
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3 | office | 57 | local core="$1" |
58 | |||
59 | echo "/dev/zram${core:-0}" |
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1 | office | 60 | } |
61 | |||
62 | zram_reset() |
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63 | { |
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64 | local dev="$1" |
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65 | local message="$2" |
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66 | local proc_entry="/sys/block/$( basename "$dev" )/reset" |
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67 | |||
68 | logger -s -t zram_reset -p daemon.debug "$message via $proc_entry" |
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69 | echo "1" >"$proc_entry" |
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70 | } |
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71 | |||
3 | office | 72 | list_cpu_idx() |
1 | office | 73 | { |
3 | office | 74 | # Offset by 1 if /dev/zram0 is in use by /tmp |
75 | if [ "$(mount | grep /dev/zram0)" ]; then |
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76 | local line i=1 |
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77 | # Hot-add new ZRAM device (if necessary) |
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78 | if [ ! -b /dev/zram1 ]; then |
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79 | cat /sys/class/zram-control/hot_add |
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80 | fi |
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1 | office | 81 | else |
3 | office | 82 | local line i=0 |
1 | office | 83 | fi |
3 | office | 84 | |
85 | while read line; do { |
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86 | case "$line" in |
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87 | [Pp]rocessor*) |
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88 | echo $i |
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89 | i=$(( $i + 1 )) |
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90 | ;; |
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91 | esac |
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92 | } done <"/proc/cpuinfo" |
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1 | office | 93 | } |
94 | |||
3 | office | 95 | start() |
1 | office | 96 | { |
3 | office | 97 | # http://shmilyxbq-compcache.googlecode.com/hg/README |
98 | # if >1 cpu_core, reinit kmodule with e.g. num_devices=4 |
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1 | office | 99 | |
100 | local zram_size="$( zram_size )" |
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3 | office | 101 | local zram_dev core |
1 | office | 102 | |
3 | office | 103 | for core in $( list_cpu_idx ); do { |
104 | zram_dev="$( zram_dev "$core" )" |
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105 | zram_applicable "$zram_dev" || return 1 |
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1 | office | 106 | |
3 | office | 107 | logger -s -t zram_start -p daemon.debug "activating '$zram_dev' for swapping ($zram_size MegaBytes)" |
1 | office | 108 | |
3 | office | 109 | zram_reset "$zram_dev" "enforcing defaults" |
110 | echo $(( $zram_size * 1024 * 1024 )) >"/sys/block/$( basename $zram_dev )/disksize" |
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111 | mkswap "$zram_dev" |
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112 | swapon "$zram_dev" |
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113 | } done |
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1 | office | 114 | } |
115 | |||
116 | stop() |
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117 | { |
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3 | office | 118 | local zram_dev proc_entry |
1 | office | 119 | |
3 | office | 120 | for core in $( list_cpu_idx ); do { |
121 | zram_dev="$( zram_dev "$core" )" |
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122 | proc_entry="/sys/block/$( basename "$zram_dev" )/reset" |
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123 | |||
124 | grep -sq ^"$zram_dev " /proc/swaps && { |
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125 | logger -s -t zram_stop -p daemon.debug "deactivate swap $zram_dev" |
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126 | swapoff "$zram_dev" |
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127 | } |
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128 | |||
129 | zram_reset "$zram_dev" "claiming memory back" |
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1 | office | 130 | } done |
131 | } |
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132 |