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SubjectRe: [PATCH v2 00/31] Replacing net_mutex with rw_semaphore
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On 18.01.2018 20:43, Andrei Vagin wrote:
> On Mon, Nov 20, 2017 at 09:32:08PM +0300, 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)
>
> Good job!
>
> Acked-by: Andrei Vagin <avagin@virtuozzo.com>

Thanks, Andrei!

>> ---
>>
>> 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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