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| author |   Björn Töpel <bjorn.topel@intel.com> | 2019-12-19 07:09:59 +0100 |
|---|---|---|
| committer |   Alexei Starovoitov <ast@kernel.org> | 2019-12-19 21:09:43 -0800 |
| commit | 0536b85239b8440735cdd910aae0eb076ebbb439 (patch) | |
| tree | fab5254d7ae58913aca58e39a04d856a016c913a /tools/perf/scripts/python/export-to-postgresql.py | |
| parent | bpf: Remove unnecessary assertion on fp_old (diff) | |
| download | linux-dev-0536b85239b8440735cdd910aae0eb076ebbb439.tar.xz linux-dev-0536b85239b8440735cdd910aae0eb076ebbb439.zip | |
xdp: Simplify devmap cleanup
After the RCU flavor consolidation [1], call_rcu() and
synchronize_rcu() waits for preempt-disable regions (NAPI) in addition
to the read-side critical sections. As a result of this, the cleanup
code in devmap can be simplified
* There is no longer a need to flush in __dev_map_entry_free, since we
know that this has been done when the call_rcu() callback is
triggered.
* When freeing the map, there is no need to explicitly wait for a
flush. It's guaranteed to be done after the synchronize_rcu() call
in dev_map_free(). The rcu_barrier() is still needed, so that the
map is not freed prior the elements.
[1] https://lwn.net/Articles/777036/
Signed-off-by: Björn Töpel <bjorn.topel@intel.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Toke Høiland-Jørgensen <toke@redhat.com>
Link: https://lore.kernel.org/bpf/20191219061006.21980-2-bjorn.topel@gmail.com
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions