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H A D | neighbour.c | cdd8512a Tue Dec 05 21:38:33 CST 2023 Judy Hsiao <judyhsiao@chromium.org> neighbour: Don't let neigh_forced_gc() disable preemption for long
[ Upstream commit e5dc5afff62f3e97e86c3643ec9fcad23de4f2d3 ]
We are seeing cases where neigh_cleanup_and_release() is called by neigh_forced_gc() many times in a row with preemption turned off. When running on a low powered CPU at a low CPU frequency, this has been measured to keep preemption off for ~10 ms. That's not great on a system with HZ=1000 which expects tasks to be able to schedule in with ~1ms latency.
Suggested-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: Judy Hsiao <judyhsiao@chromium.org> Reviewed-by: David Ahern <dsahern@kernel.org> Reviewed-by: Eric Dumazet <edumazet@google.com> Reviewed-by: Douglas Anderson <dianders@chromium.org> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Sasha Levin <sashal@kernel.org>
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