[PATCH v2 0/1] net: Reduce rcu_barrier() contentions from 'unshare(CLONE_NEWNET)'

[SeongJae Park <sjpark@amazon.com>]

From: SeongJae Park <sjpark@amazon.de>

On a few of our systems, I found frequent 'unshare(CLONE_NEWNET)' calls
make the number of active slab objects including 'sock_inode_cache' type
rapidly and continuously increase.  As a result, memory pressure occurs.

In more detail, I made an artificial reproducer that resembles the
workload that we found the problem and reproduce the problem faster.  It
merely repeats 'unshare(CLONE_NEWNET)' 50,000 times in a loop.  It takes
about 2 minutes.  On 40 CPU cores, 70GB DRAM machine, it reduced about
15GB of available memory in total.  Note that the issue don't reproduce
on every machine.  On my 6 CPU cores machine, the problem didn't
reproduce.

'cleanup_net()' and 'fqdir_work_fn()' are functions that deallocate the
relevant memory objects.  They are asynchronously invoked by the work
queues and internally use 'rcu_barrier()' to ensure safe destructions.
'cleanup_net()' works in a batched maneer in a single thread worker,
while 'fqdir_work_fn()' works for each 'fqdir_exit()' call in the
'system_wq'.

Therefore, 'fqdir_work_fn()' called frequently under the workload and
made the contention for 'rcu_barrier()' high.  In more detail, the
global mutex, 'rcu_state.barrier_mutex' became the bottleneck.

I tried making 'fqdir_work_fn()' batched and confirmed it works.  The
following patch is for the change.  I think this is the right solution
for point fix of this issue, but someone might blame different parts.

1. User: Frequent 'unshare()' calls
From some point of view, such frequent 'unshare()' calls might seem only
insane.

2. Global mutex in 'rcu_barrier()'
Because of the global mutex, 'rcu_barrier()' callers could wait long
even after the callbacks started before the call finished.  Therefore,
similar issues could happen in another 'rcu_barrier()' usages.  Maybe we
can use some wait queue like mechanism to notify the waiters when the
desired time came.

I personally believe applying the point fix for now and making
'rcu_barrier()' improvement in longterm make sense.  If I'm missing
something or you have different opinion, please feel free to let me
know.


Patch History
-------------

Changes from v1
(https://lore.kernel.org/netdev/20201208094529.23266-1-sjpark@amazon.com/)
- Keep xmas tree variable ordering (Jakub Kicinski)
- Add more numbers (Eric Dumazet)
- Use 'llist_for_each_entry_safe()' (Eric Dumazet)

SeongJae Park (1):
  net/ipv4/inet_fragment: Batch fqdir destroy works

 include/net/inet_frag.h  |  2 +-
 net/ipv4/inet_fragment.c | 28 ++++++++++++++++++++--------
 2 files changed, 21 insertions(+), 9 deletions(-)

-- 
2.17.1