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2530dc0ebd
Add Linux kernel OOM killer control option. This adds the ability to control the Linux OOM killer oom_score_adj parameter for all Redis processes, depending on the process role (i.e. master, replica, background child). A oom-score-adj global boolean flag control this feature. In addition, specific values can be configured using oom-score-adj-values if additional tuning is required.
82 lines
2.6 KiB
Tcl
82 lines
2.6 KiB
Tcl
set system_name [string tolower [exec uname -s]]
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set user_id [exec id -u]
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if {$system_name eq {linux}} {
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start_server {tags {"oom-score-adj"}} {
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proc get_oom_score_adj {{pid ""}} {
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if {$pid == ""} {
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set pid [srv 0 pid]
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}
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set fd [open "/proc/$pid/oom_score_adj" "r"]
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set val [gets $fd]
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close $fd
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return $val
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}
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proc get_child_pid {} {
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set pid [srv 0 pid]
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set fd [open "|ps --ppid $pid -o pid -h" "r"]
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set child_pid [string trim [read $fd]]
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close $fd
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return $child_pid
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}
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test {CONFIG SET oom-score-adj works as expected} {
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set base [get_oom_score_adj]
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# Enable oom-score-adj, check defaults
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r config set oom-score-adj-values "10 20 30"
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r config set oom-score-adj yes
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assert {[get_oom_score_adj] == [expr $base + 10]}
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# Modify current class
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r config set oom-score-adj-values "15 20 30"
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assert {[get_oom_score_adj] == [expr $base + 15]}
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# Check replica class
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r replicaof localhost 1
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assert {[get_oom_score_adj] == [expr $base + 20]}
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r replicaof no one
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assert {[get_oom_score_adj] == [expr $base + 15]}
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# Check child process
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r set key-a value-a
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r config set rdb-key-save-delay 100000
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r bgsave
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set child_pid [get_child_pid]
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assert {[get_oom_score_adj $child_pid] == [expr $base + 30]}
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}
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# Failed oom-score-adj tests can only run unprivileged
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if {$user_id != 0} {
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test {CONFIG SET oom-score-adj handles configuration failures} {
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# Bad config
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r config set oom-score-adj no
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r config set oom-score-adj-values "-1000 -1000 -1000"
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# Make sure it fails
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catch {r config set oom-score-adj yes} e
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assert_match {*Failed to set*} $e
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# Make sure it remains off
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assert {[r config get oom-score-adj] == "oom-score-adj no"}
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# Fix config
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r config set oom-score-adj-values "0 100 100"
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r config set oom-score-adj yes
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# Make sure it fails
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catch {r config set oom-score-adj-values "-1000 -1000 -1000"} e
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assert_match {*Failed*} $e
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# Make sure previous values remain
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assert {[r config get oom-score-adj-values] == {oom-score-adj-values {0 100 100}}}
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}
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}
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}
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}
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