[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen staging] tools/xenstore: set open file descriptor limit for xenstored
commit 9cfeb83cbe23a873de512211d7ecd989348b9df0 Author: Juergen Gross <jgross@xxxxxxxx> AuthorDate: Tue Oct 12 15:41:48 2021 +0200 Commit: Ian Jackson <iwj@xxxxxxxxxxxxxx> CommitDate: Mon Oct 18 14:17:28 2021 +0100 tools/xenstore: set open file descriptor limit for xenstored Add a configuration item for the maximum number of open file descriptors xenstored should be allowed to have. The default should be "unlimited" in order not to restrict xenstored in the number of domains it can support, but unfortunately the kernel is normally limiting the maximum value via /proc/sys/fs/nr_open [1], [2]. So check that file to exist and if it does, limit the maximum value to the one specified by /proc/sys/fs/nr_open. As an aid for the admin configuring the value add a comment specifying the common needs of xenstored for the different domain types. [1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=60fd760fb9ff7034360bab7137c917c0330628c2 [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=0c2d64fb6cae9aae480f6a46cfe79f8d7d48b59f Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Reviewed-by: Ian Jackson <iwj@xxxxxxxxxxxxxx> Release-Acked-by: Ian Jackson <iwj@xxxxxxxxxxxxxx> --- tools/hotplug/Linux/init.d/sysconfig.xencommons.in | 13 +++++++++++++ tools/hotplug/Linux/launch-xenstore.in | 21 ++++++++++++++++++++- 2 files changed, 33 insertions(+), 1 deletion(-) diff --git a/tools/hotplug/Linux/init.d/sysconfig.xencommons.in b/tools/hotplug/Linux/init.d/sysconfig.xencommons.in index b83101ab7e..433e4849af 100644 --- a/tools/hotplug/Linux/init.d/sysconfig.xencommons.in +++ b/tools/hotplug/Linux/init.d/sysconfig.xencommons.in @@ -32,6 +32,19 @@ # Changing this requires a reboot to take effect. #XENSTORED=@XENSTORED@ +## Type: string +## Default: unlimited +# +# Select maximum number of file descriptors xenstored is allowed to have +# opened at one time. +# For each HVM domain xenstored might need up to 5 open file descriptors, +# PVH and PV domains will require up to 3 open file descriptors. Additionally +# 20-30 file descriptors will be opened for internal uses. +# The specified value (including "unlimited") will be capped by the contents +# of /proc/sys/fs/nr_open if existing. +# Only evaluated if XENSTORETYPE is "daemon". +#XENSTORED_MAX_OPEN_FDS=unlimited + ## Type: string ## Default: "" # diff --git a/tools/hotplug/Linux/launch-xenstore.in b/tools/hotplug/Linux/launch-xenstore.in index 1747c96065..8438af9977 100644 --- a/tools/hotplug/Linux/launch-xenstore.in +++ b/tools/hotplug/Linux/launch-xenstore.in @@ -54,6 +54,7 @@ test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . @CONFIG_DIR@/@CONFIG_LEAF [ "$XENSTORETYPE" = "daemon" ] && { [ -z "$XENSTORED_TRACE" ] || XENSTORED_ARGS="$XENSTORED_ARGS -T @XEN_LOG_DIR@/xenstored-trace.log" + [ -z "$XENSTORED_MAX_OPEN_FDS" ] && XENSTORED_MAX_OPEN_FDS=unlimited [ -z "$XENSTORED" ] && XENSTORED=@XENSTORED@ [ -x "$XENSTORED" ] || { echo "No xenstored found" @@ -62,10 +63,28 @@ test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . @CONFIG_DIR@/@CONFIG_LEAF [ -z "$XENSTORED_OOM_MEM_THRESHOLD" ] || XENSTORED_OOM_MEM_THRESHOLD=50 XS_OOM_SCORE=-$(($XENSTORED_OOM_MEM_THRESHOLD * 10)) + [ "$XENSTORED_MAX_OPEN_FDS" = "unlimited" ] || { + [ -z "${XENSTORED_MAX_OPEN_FDS//[0-9]}" ] && + [ -n "$XENSTORED_MAX_OPEN_FDS" ] || { + echo "XENSTORED_MAX_OPEN_FDS=$XENSTORED_MAX_OPEN_FDS invalid" + echo "Setting to default \"unlimited\"." + XENSTORED_MAX_OPEN_FDS=unlimited + } + } + [ -r /proc/sys/fs/nr_open ] && { + MAX_FDS=`cat /proc/sys/fs/nr_open` + [ "$XENSTORED_MAX_OPEN_FDS" = "unlimited" ] && XENSTORED_MAX_OPEN_FDS=$MAX_FDS + [ $XENSTORED_MAX_OPEN_FDS -gt $MAX_FDS ] && { + echo "XENSTORED_MAX_OPEN_FDS exceeds system limit." + echo "Setting to \"$MAX_FDS\"." + XENSTORED_MAX_OPEN_FDS=$MAX_FDS + } + } + rm -f @XEN_RUN_DIR@/xenstored.pid echo -n Starting $XENSTORED... - $XENSTORED --pid-file @XEN_RUN_DIR@/xenstored.pid $XENSTORED_ARGS + prlimit --nofile=$XENSTORED_MAX_OPEN_FDS $XENSTORED --pid-file @XEN_RUN_DIR@/xenstored.pid $XENSTORED_ARGS systemd-notify --booted 2>/dev/null || timeout_xenstore $XENSTORED || exit 1 XS_PID=`cat @XEN_RUN_DIR@/xenstored.pid` -- generated by git-patchbot for /home/xen/git/xen.git#staging
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