libvirt/src/qemu/libvirtd_qemu.aug
Jim Fehlig d5572f62e3 qemu: Add support for overriding max threads per process limit
Some VM configurations may result in a large number of threads created by
the associated qemu process which can exceed the system default limit. The
maximum number of threads allowed per process is controlled by the pids
cgroup controller and is set to 16k when creating VMs with systemd's
machined service. The maximum number of threads per process is recorded
in the pids.max file under the machine's pids controller cgroup hierarchy,
e.g.

$cgrp-mnt/pids/machine.slice/machine-qemu\\x2d1\\x2dtest.scope/pids.max

Maximum threads per process is controlled with the TasksMax property of
the systemd scope for the machine. This patch adds an option to qemu.conf
which can be used to override the maximum number of threads allowed per
qemu process. If the value of option is greater than zero, it will be set
in the TasksMax property of the machine's scope after creating the machine.

Signed-off-by: Jim Fehlig <jfehlig@suse.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
2019-07-24 15:59:49 -06:00

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(* /etc/libvirt/qemu.conf *)
module Libvirtd_qemu =
autoload xfm
let eol = del /[ \t]*\n/ "\n"
let value_sep = del /[ \t]*=[ \t]*/ " = "
let indent = del /[ \t]*/ ""
let array_sep = del /,[ \t\n]*/ ", "
let array_start = del /\[[ \t\n]*/ "[ "
let array_end = del /\]/ "]"
let str_val = del /\"/ "\"" . store /[^\"]*/ . del /\"/ "\""
let bool_val = store /0|1/
let int_val = store /[0-9]+/
let str_array_element = [ seq "el" . str_val ] . del /[ \t\n]*/ ""
let str_array_val = counter "el" . array_start . ( str_array_element . ( array_sep . str_array_element ) * ) ? . array_end
let str_entry (kw:string) = [ key kw . value_sep . str_val ]
let bool_entry (kw:string) = [ key kw . value_sep . bool_val ]
let int_entry (kw:string) = [ key kw . value_sep . int_val ]
let str_array_entry (kw:string) = [ key kw . value_sep . str_array_val ]
let unlimited_val = del /\"/ "\"" . store /unlimited/ . del /\"/ "\""
let limits_entry (kw:string) = [ key kw . value_sep . unlimited_val ] | [ key kw . value_sep . int_val ]
(* Config entry grouped by function - same order as example config *)
let default_tls_entry = str_entry "default_tls_x509_cert_dir"
| bool_entry "default_tls_x509_verify"
| str_entry "default_tls_x509_secret_uuid"
let vnc_entry = str_entry "vnc_listen"
| bool_entry "vnc_auto_unix_socket"
| bool_entry "vnc_tls"
| str_entry "vnc_tls_x509_cert_dir"
| str_entry "vnc_tls_x509_secret_uuid"
| bool_entry "vnc_tls_x509_verify"
| str_entry "vnc_password"
| bool_entry "vnc_sasl"
| str_entry "vnc_sasl_dir"
| bool_entry "vnc_allow_host_audio"
let spice_entry = str_entry "spice_listen"
| bool_entry "spice_tls"
| str_entry "spice_tls_x509_cert_dir"
| bool_entry "spice_auto_unix_socket"
| str_entry "spice_password"
| bool_entry "spice_sasl"
| str_entry "spice_sasl_dir"
let chardev_entry = bool_entry "chardev_tls"
| str_entry "chardev_tls_x509_cert_dir"
| bool_entry "chardev_tls_x509_verify"
| str_entry "chardev_tls_x509_secret_uuid"
let migrate_entry = str_entry "migrate_tls_x509_cert_dir"
| bool_entry "migrate_tls_x509_verify"
| str_entry "migrate_tls_x509_secret_uuid"
let nogfx_entry = bool_entry "nographics_allow_host_audio"
let remote_display_entry = int_entry "remote_display_port_min"
| int_entry "remote_display_port_max"
| int_entry "remote_websocket_port_min"
| int_entry "remote_websocket_port_max"
let security_entry = str_entry "security_driver"
| bool_entry "security_default_confined"
| bool_entry "security_require_confined"
| str_entry "user"
| str_entry "group"
| bool_entry "dynamic_ownership"
| bool_entry "remember_owner"
| str_array_entry "cgroup_controllers"
| str_array_entry "cgroup_device_acl"
| int_entry "seccomp_sandbox"
| str_array_entry "namespaces"
let save_entry = str_entry "save_image_format"
| str_entry "dump_image_format"
| str_entry "snapshot_image_format"
| str_entry "auto_dump_path"
| bool_entry "auto_dump_bypass_cache"
| bool_entry "auto_start_bypass_cache"
let process_entry = str_entry "hugetlbfs_mount"
| bool_entry "clear_emulator_capabilities"
| str_entry "bridge_helper"
| str_entry "pr_helper"
| bool_entry "set_process_name"
| int_entry "max_processes"
| int_entry "max_files"
| limits_entry "max_core"
| bool_entry "dump_guest_core"
| str_entry "stdio_handler"
| int_entry "max_threads_per_process"
let device_entry = bool_entry "mac_filter"
| bool_entry "relaxed_acs_check"
| bool_entry "allow_disk_format_probing"
| str_entry "lock_manager"
let rpc_entry = int_entry "max_queued"
| int_entry "keepalive_interval"
| int_entry "keepalive_count"
let network_entry = str_entry "migration_address"
| int_entry "migration_port_min"
| int_entry "migration_port_max"
| str_entry "migration_host"
let log_entry = bool_entry "log_timestamp"
let nvram_entry = str_array_entry "nvram"
let gluster_debug_level_entry = int_entry "gluster_debug_level"
let memory_entry = str_entry "memory_backing_dir"
let vxhs_entry = bool_entry "vxhs_tls"
| str_entry "vxhs_tls_x509_cert_dir"
let nbd_entry = bool_entry "nbd_tls"
| str_entry "nbd_tls_x509_cert_dir"
let swtpm_entry = str_entry "swtpm_user"
| str_entry "swtpm_group"
let capability_filters_entry = str_array_entry "capability_filters"
(* Each entry in the config is one of the following ... *)
let entry = default_tls_entry
| vnc_entry
| spice_entry
| chardev_entry
| migrate_entry
| nogfx_entry
| remote_display_entry
| security_entry
| save_entry
| process_entry
| device_entry
| rpc_entry
| network_entry
| log_entry
| nvram_entry
| gluster_debug_level_entry
| memory_entry
| vxhs_entry
| nbd_entry
| swtpm_entry
| capability_filters_entry
let comment = [ label "#comment" . del /#[ \t]*/ "# " . store /([^ \t\n][^\n]*)?/ . del /\n/ "\n" ]
let empty = [ label "#empty" . eol ]
let record = indent . entry . eol
let lns = ( record | comment | empty ) *
let filter = incl "/etc/libvirt/qemu.conf"
. Util.stdexcl
let xfm = transform lns filter