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| author | Eric Dumazet <edumazet@google.com> | 2018-09-13 17:58:48 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 23:43:46 +0300 |
| commit | bd946fb5226e205530bea2581d867642e4b457ed (patch) | |
| tree | 1f57581d59a4ac761fba1a759b9c890d78526f33 | |
| parent | 3226bdcb044862084c3bfc3278d148948600ebc4 (diff) | |
| download | linux-bd946fb5226e205530bea2581d867642e4b457ed.tar.xz | |
rhashtable: reorganize struct rhashtable layout
While under frags DDOS I noticed unfortunate false sharing between
@nelems and @params.automatic_shrinking
Move @nelems at the end of struct rhashtable so that first cache line
is shared between all cpus, because almost never dirtied.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit e5d672a0780d9e7118caad4c171ec88b8299398d)
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | include/linux/rhashtable.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/include/linux/rhashtable.h b/include/linux/rhashtable.h index 7fd514f36e74..a4be6388a980 100644 --- a/include/linux/rhashtable.h +++ b/include/linux/rhashtable.h @@ -152,25 +152,25 @@ struct rhashtable_params { /** * struct rhashtable - Hash table handle * @tbl: Bucket table - * @nelems: Number of elements in table * @key_len: Key length for hashfn - * @p: Configuration parameters * @max_elems: Maximum number of elements in table + * @p: Configuration parameters * @rhlist: True if this is an rhltable * @run_work: Deferred worker to expand/shrink asynchronously * @mutex: Mutex to protect current/future table swapping * @lock: Spin lock to protect walker list + * @nelems: Number of elements in table */ struct rhashtable { struct bucket_table __rcu *tbl; - atomic_t nelems; unsigned int key_len; - struct rhashtable_params p; unsigned int max_elems; + struct rhashtable_params p; bool rhlist; struct work_struct run_work; struct mutex mutex; spinlock_t lock; + atomic_t nelems; }; /** |