Re: [libvirt] [PATCH v4 2/2] libxl: keepalive messages support

This patch introduces keep alive messages support for P2P migration and it adds two new configuration entries namely 'keepalive_interval' 'keepalive_count' to control it. Behavior of these entries is the same as qemu driver thus the description is copied from there with just a few simplifications. Signed-off-by: Joao Martins <joao.m.martins(a)oracle.com&gt; --- Note: v4 series requires the patch ("remote: set VIR_TYPED_PARAM_STRING_OKAY on migration") to make migration work again, but it's not reviewed yet. [https://www.redhat.com/archives/libvir-list/2016-February/msg00317.html] --- src/libxl/libvirtd_libxl.aug | 4 ++++ src/libxl/libxl.conf | 18 ++++++++++++++++++ src/libxl/libxl_conf.c | 26 ++++++++++++++++++++++++++ src/libxl/libxl_conf.h | 3 +++ src/libxl/libxl_migration.c | 6 ++++++ src/libxl/test_libvirtd_libxl.aug.in | 2 ++ 6 files changed, 59 insertions(+) diff --git a/src/libxl/libvirtd_libxl.aug b/src/libxl/libvirtd_libxl.aug index d5aa150..b31cc07 100644 --- a/src/libxl/libvirtd_libxl.aug +++ b/src/libxl/libvirtd_libxl.aug @@ -26,10 +26,14 @@ module Libvirtd_libxl = (* Config entry grouped by function - same order as example config *) let autoballoon_entry = bool_entry "autoballoon" let lock_entry = str_entry "lock_manager" + let keepalive_interval_entry = int_entry "keepalive_interval" + let keepalive_count_entry = int_entry "keepalive_count" (* Each entry in the config is one of the following ... *) let entry = autoballoon_entry | lock_entry + | keepalive_interval_entry + | keepalive_count_entry let comment = [ label "#comment" . del /#[ \t]*/ "# " . store /([^ \t\n][^\n]*)?/ . del /\n/ "\n" ] let empty = [ label "#empty" . eol ] diff --git a/src/libxl/libxl.conf b/src/libxl/libxl.conf index ba3de7a..82abdb6 100644 --- a/src/libxl/libxl.conf +++ b/src/libxl/libxl.conf @@ -20,3 +20,21 @@ # "lockd". Accepted values are "sanlock" and "lockd". # #lock_manager = "lockd" + + +# A keepalive message is sent to the daemon after keepalive_interval +# seconds of inactivity to check if the daemon is still responding; +# keepalive_count is a maximum number of keepalive messages that are +# allowed to be sent to the deamon without getting any response before +# the connection is considered broken. In other words, the connection +# is automatically closed approximately after keepalive_interval * +# (keepalive_count + 1) seconds since the last message received from +# the daemon. If keepalive_interval is set to -1, libxl driver will +# not send keepalive requests during peer-to-peer migration; however, +# the remote libvirtd can still send them and source libvirtd will +# send responses. When keepalive_count is set to 0, connections will +# be automatically closed after keepalive_interval seconds of +# inactivity without sending any keepalive messages. +# +#keepalive_interval = 5 +#keepalive_count = 5