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authorPaolo Abeni <pabeni@redhat.com>2019-04-10 14:32:40 +0200
committerDavid S. Miller <davem@davemloft.net>2019-04-10 12:20:46 -0700
commit8a53e616de294873fec1a75ddb77ecb3d225cee0 (patch)
tree417d298678e0f2bba183375d0754ff2f8ccbe19e /MAINTAINERS
parent9c01c9f1f2a3ddbddbf3b233cc6bfa86f5a59af0 (diff)
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net: sched: when clearing NOLOCK, clear TCQ_F_CPUSTATS, too
Since stats updating is always consistent with TCQ_F_CPUSTATS flag, we can disable it at qdisc creation time flipping such bit. In my experiments, if the NOLOCK flag is cleared, per CPU stats accounting does not give any measurable performance gain, but it waste some memory. Let's clear TCQ_F_CPUSTATS together with NOLOCK, when enslaving a NOLOCK qdisc to 'lock' one. Use stats update helper inside pfifo_fast, to cope correctly with TCQ_F_CPUSTATS flag change. As a side effect, q.qlen value for any child qdiscs is always consistent for all lock classfull qdiscs. Signed-off-by: Paolo Abeni <pabeni@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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