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SubjectRe: [PATCH v2 00/31] Replacing net_mutex with rw_semaphore
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Still no comments :(

Ping, ping, ping.

Here is the second version of big patch set with Eric's commentaries accounted.

What will we do next?

On 20.11.2017 21:32, Kirill Tkhai wrote:
> Hi,
>
> there is the second version of patchset introducing net_sem
> instead of net_mutex. The patchset adds net_sem in addition
> to net_mutex and allows pernet_operations to be async. This
> flag means, the pernet_operations methods are safe to be
> executed with any othor pernet_operations (un)initializing
> another net.
>
> If there are only async pernet_operations in the system,
> net_mutex is not used either for setup_net() or for cleanup_net().
>
> The flag is little easier, then (un)register_pernet_sys(),
> as it changes one line only. Also, it requires less changes
> in code. In future, when all pernet_operations are async,
> we'll just remove this struct field.
>
> The pernet_operations converted in this patchset allow
> to create minimal .config to have network working, and
> the changes improve the performance like you may see
> below:
>
> %for i in {1..10000}; do unshare -n bash -c exit; done
>
> *before*
> real 1m40,377s
> user 0m9,672s
> sys 0m19,928s
>
> *after*
> real 0m17,007s
> user 0m5,311s
> sys 0m11,779
>
> (5.8 times faster)
> ---
>
> Kirill Tkhai (31):
> net: Assign net to net_namespace_list in setup_net()
> net: Cleanup copy_net_ns()
> net: Introduce net_sem for protection of pernet_list
> net: Move mutex_unlock() in cleanup_net() up
> net: Allow pernet_operations to be executed in parallel
> net: Convert proc_net_ns_ops
> net: Convert net_ns_ops methods
> net: Convert sysctl_pernet_ops
> net: Convert netfilter_net_ops
> net: Convert nf_log_net_ops
> net: Convert net_inuse_ops
> net: Convert net_defaults_ops
> net: Convert netlink_net_ops
> net: Convert rtnetlink_net_ops
> net: Convert audit_net_ops
> net: Convert uevent_net_ops
> net: Convert proto_net_ops
> net: Convert pernet_subsys ops, registered via net_dev_init()
> net: Convert fib_* pernet_operations, registered via subsys_initcall
> net: Convert subsys_initcall() registered pernet_operations from net/sched
> net: Convert genl_pernet_ops
> net: Convert wext_pernet_ops
> net: Convert sysctl_core_ops
> net: Convert pernet_subsys, registered from inet_init()
> net: Convert unix_net_ops
> net: Convert packet_net_ops
> net: Convert ipv4_sysctl_ops
> net: Convert addrconf_ops
> net: Convert loopback_net_ops
> net: Convert default_device_ops
> net: Convert diag_net_ops
>
>
> drivers/net/loopback.c | 1
> fs/proc/proc_net.c | 1
> include/linux/rtnetlink.h | 1
> include/net/net_namespace.h | 6 +++
> kernel/audit.c | 1
> lib/kobject_uevent.c | 1
> net/core/dev.c | 2 +
> net/core/fib_notifier.c | 1
> net/core/fib_rules.c | 1
> net/core/net-procfs.c | 2 +
> net/core/net_namespace.c | 94 +++++++++++++++++++++++++------------------
> net/core/rtnetlink.c | 5 +-
> net/core/sock.c | 2 +
> net/core/sock_diag.c | 1
> net/core/sysctl_net_core.c | 1
> net/ipv4/af_inet.c | 2 +
> net/ipv4/arp.c | 1
> net/ipv4/devinet.c | 1
> net/ipv4/fib_frontend.c | 1
> net/ipv4/icmp.c | 1
> net/ipv4/igmp.c | 1
> net/ipv4/ip_fragment.c | 1
> net/ipv4/ipmr.c | 1
> net/ipv4/ping.c | 1
> net/ipv4/proc.c | 1
> net/ipv4/raw.c | 1
> net/ipv4/route.c | 4 ++
> net/ipv4/sysctl_net_ipv4.c | 1
> net/ipv4/tcp_ipv4.c | 2 +
> net/ipv4/tcp_metrics.c | 1
> net/ipv4/udp.c | 1
> net/ipv4/udplite.c | 1
> net/ipv4/xfrm4_policy.c | 1
> net/ipv6/addrconf.c | 1
> net/netfilter/core.c | 1
> net/netfilter/nf_log.c | 1
> net/netlink/af_netlink.c | 1
> net/netlink/genetlink.c | 1
> net/packet/af_packet.c | 1
> net/sched/act_api.c | 1
> net/sched/sch_api.c | 1
> net/sysctl_net.c | 1
> net/unix/af_unix.c | 1
> net/wireless/wext-core.c | 1
> net/xfrm/xfrm_policy.c | 1
> 45 files changed, 114 insertions(+), 41 deletions(-)
>
> --
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
>

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