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Mon, 27 Sep 2021 10:48:15 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id MBL/Nm+hUWHBKgAAMHmgww (envelope-from ); Mon, 27 Sep 2021 10:48:15 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" X-Inumbo-ID: 6b8e251c-1f80-11ec-bc44-12813bfff9fa DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=susede1; t=1632739696; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0bTrNbQ0miBKyNabZ7OBv568TXSZHmfPJwYLlLSwrss=; b=Pl/LD+1gSxuMVta+tt/eO4ZEzBzgRAh0YlzD8rfBG3ybn9WUnHRuV3h1n4vB6BUPDAaSZk CGlvtWQxwq+0Ata56n89R9ybSNeVv45CwdRIN0EcYkL0piIPBNEHV363QHagqSrrkaH3YR 4GJa+Qx4t7+iXWBRHSP5Jrfls7TgDjw= From: Juergen Gross To: xen-devel@lists.xenproject.org Cc: Juergen Gross , Ian Jackson , Wei Liu Subject: [PATCH v4 2/2] tools/xenstore: set open file descriptor limit for xenstored Date: Mon, 27 Sep 2021 12:48:13 +0200 Message-Id: <20210927104813.19772-3-jgross@suse.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210927104813.19772-1-jgross@suse.com> References: <20210927104813.19772-1-jgross@suse.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @suse.com) X-ZM-MESSAGEID: 1632739714896100002 Content-Type: text/plain; charset="utf-8" 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 prlimit command requires specification of a real value for the number of files, so use 262144 as the default value. As an aid for the admin configuring the value add a comment specifying the common needs of xenstored for the different domain types. Signed-off-by: Juergen Gross --- V2: - set ulimit form launch script (Julien Grall) - split off from original patch (Julien Grall) V4: - switch to directly configuring the limit of file descriptors instead of domains (Ian Jackson) --- tools/hotplug/Linux/init.d/sysconfig.xencommons.in | 13 +++++++++++++ tools/hotplug/Linux/launch-xenstore.in | 2 ++ 2 files changed, 15 insertions(+) diff --git a/tools/hotplug/Linux/init.d/sysconfig.xencommons.in b/tools/hot= plug/Linux/init.d/sysconfig.xencommons.in index b83101ab7e..ad020b7a50 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=3D@XENSTORED@ =20 +## Type: integer +## Default: 262144 +# +# 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. Additiona= lly +# 20-30 file descriptors will be opened for internal uses. The default of +# 262144 allows for about 8 open files for the theoretical maximum of 32752 +# domains. +# Only evaluated if XENSTORETYPE is "daemon". +#XENSTORED_MAX_OPEN_FDS=3D262144 + ## Type: string ## Default: "" # diff --git a/tools/hotplug/Linux/launch-xenstore.in b/tools/hotplug/Linux/l= aunch-xenstore.in index 1747c96065..2bc41bb4f0 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 && . @C= ONFIG_DIR@/@CONFIG_LEAF =20 [ "$XENSTORETYPE" =3D "daemon" ] && { [ -z "$XENSTORED_TRACE" ] || XENSTORED_ARGS=3D"$XENSTORED_ARGS -T @XEN_LO= G_DIR@/xenstored-trace.log" + [ -z "$XENSTORED_MAX_OPEN_FDS" ] && XENSTORED_MAX_OPEN_FDS=3D262144 [ -z "$XENSTORED" ] && XENSTORED=3D@XENSTORED@ [ -x "$XENSTORED" ] || { echo "No xenstored found" @@ -70,6 +71,7 @@ test -f @CONFIG_DIR@/@CONFIG_LEAF_DIR@/xencommons && . @C= ONFIG_DIR@/@CONFIG_LEAF systemd-notify --booted 2>/dev/null || timeout_xenstore $XENSTORED || exi= t 1 XS_PID=3D`cat @XEN_RUN_DIR@/xenstored.pid` echo $XS_OOM_SCORE >/proc/$XS_PID/oom_score_adj + prlimit --pid $XS_PID --nofile=3D$XENSTORED_MAX_OPEN_FDS =20 exit 0 } --=20 2.26.2