In the fast-forward case, when the number of flows exceeds IPFLOW_MAX, the
performmance degraded to about 50% compared to the case less than IPFLOW_MAX
flows. This modification suppresses the degradation to 65%. Furthermore,
the modified kernel is about the same performance as the original kernel
when the number of flows is less than IPFLOW_MAX.
The original patch is implemented by ryo@n.o. Thanks.
This change makes struct ifaddr and its variants (in_ifaddr and in6_ifaddr)
MP-safe by using pserialize and psref. At this moment, pserialize_perform
and psref_target_destroy are disabled because (1) we don't need them
because of softnet_lock (2) they cause a deadlock because of softnet_lock.
So we'll enable them when we remove softnet_lock in the future.
netstat now uses sysctl instead of kvm(3) to get address information from
the kernel. So we can avoid the issue introduced by the reverted commit
(PR kern/51325) by updating netstat with the latest source code.
sysctl variable using ?= fails with EPERM, don't print an error
message.
Ideally setting a sysctl to the same value it already has should also
not fail regardless of permissions, but this would need to be done in
the kernel.
patchunwindframe(). Instead, check before subtracting, which in this
case means at the call site.
It would probably be better to change the call signature so the
subtraction happens inside patchunwindframe(), but since I don't
really know exactly what this code is trying to do I'm not comfortable
changing it.
Issue 1 in PR 51297 from David Binderman.
so they can't illegally reenter libc.
Fixes the problem Greg A. Woods describes in PR 51267, which might or
might not be the original submitter's problem.
buffer being written.)
There's some logic here that carefully checks for vp being null, and
other logic that will crash if it is. It appears that it's all
needless paranoia. See tech-kern for more info.
Unless someone sees the assertion go off (in which case a lot more
investigation is needed) I or someone will clean out the logic at some
future point.
Spotted by coypu.
dholland