From: Kirill Tkhai <ktk...@virtuozzo.com> Date: Thu, 22 Mar 2018 12:44:46 +0300
> Commit 1215e51edad1 "ipv4: fix a deadlock in ip_ra_control" > made rtnl_lock() be used in raw_close(). This function is called > on every RAW socket destruction, so that rtnl_mutex is taken > every time. This scales very sadly. I observe cleanup_net() > spending a lot of time in rtnl_lock() and raw_close() is one > of the biggest rtnl user (since we have percpu net->ipv4.icmp_sk). > > This patchset reworks the locking: reverts the problem commit > and its descendant, and introduces rtnl-independent locking. > This may have a continuation, and someone may work on killing > rtnl_lock() in mrtsock_destruct() in the future. > > Thanks, > Kirill > > --- > v3: Change patches order: [2/5] and [3/5]. > v2: Fix sparse warning [4/5], as reported by kbuild test robot. This looks a lot better, series applied, thank you.
