From: Norbert Lange via lttng-dev <lttng-dev@lists.lttng.org>
To: lttng-dev <lttng-dev@lists.lttng.org>
Subject: [lttng-dev] Disabling sys_membarrier in lttng urcu
Date: Fri, 18 Jun 2021 00:13:39 +0200 [thread overview]
Message-ID: <CADYdroPw9Xnwqx97xQSyiFLR1s-Sb2RvtcbdRGu-VmG0Tfydgg@mail.gmail.com> (raw)
Hello,
Some old topic, see
https://lists.lttng.org/pipermail/lttng-dev/2019-November/029411.html.
(I actually thought this was solved meanwhile).
With lttng 2.13 liburcu is replicated in lttng-ust so my old custom
hack aint helping.
Aside from another crude hack, I thought about doing this:
extern int lttng_ust_urcu_has_sys_membarrier;
int setup() {
lttng_ust_urcu_has_sys_membarrier = 0;
}
this is obvious possible in my own program, but I don't know if some
lttng daemon would need to update RCU structures in shared memory that
should sync to other processes (and wont do that with sys_membarrier
in case of Xenomai threads)?
Seems safer to me to hack it out once more...
Norbert
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next reply other threads:[~2021-06-17 22:13 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 22:13 Norbert Lange via lttng-dev [this message]
2021-06-18 17:11 ` [lttng-dev] Disabling sys_membarrier in lttng urcu Mathieu Desnoyers via lttng-dev
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