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| author |   Eric Dumazet <edumazet@google.com> | 2019-06-18 11:08:59 -0700 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2019-06-19 11:37:47 -0400 |
| commit | d7d99872c144a2c2f5d9c9d83627fa833836cba5 (patch) | |
| tree | f3a83dacc74fbe6c81665fb4c46ac2572173fcc8 /net/ipv4/ip_fragment.c | |
| parent | Merge branch 'xdp-page_pool-fixes-and-in-flight-accounting' (diff) | |
| download | linux-dev-d7d99872c144a2c2f5d9c9d83627fa833836cba5.tar.xz linux-dev-d7d99872c144a2c2f5d9c9d83627fa833836cba5.zip | |
netns: add pre_exit method to struct pernet_operations
Current struct pernet_operations exit() handlers are highly
discouraged to call synchronize_rcu().
There are cases where we need them, and exit_batch() does
not help the common case where a single netns is dismantled.
This patch leverages the existing synchronize_rcu() call
in cleanup_net()
Calling optional ->pre_exit() method before ->exit() or
->exit_batch() allows to benefit from a single synchronize_rcu()
call.
Note that the synchronize_rcu() calls added in this patch
are only in error paths or slow paths.
Tested:
$ time for i in {1..1000}; do unshare -n /bin/false;done
real 0m2.612s
user 0m0.171s
sys 0m2.216s
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
0 files changed, 0 insertions, 0 deletions