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From: Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>
To: "Van Haaren, Harry" <harry.van.haaren@intel.com>,
	Mattias Rönnblom <mattias.ronnblom@ericsson.com>,
	dpdk-dev <dev@dpdk.org>
Cc: Tomasz Piatkowski <tomasz.piatkowski@ericsson.com>,
	nd <nd@arm.com>,
	Honnappa Nagarahalli <Honnappa.Nagarahalli@arm.com>,
	nd <nd@arm.com>
Subject: Re: [dpdk-dev] Retrieving lcore worker thread id
Date: Tue, 14 Jul 2020 18:59:59 +0000
Message-ID: <DB6PR0802MB2216D42FE32A9BC0FD071A3F98610@DB6PR0802MB2216.eurprd08.prod.outlook.com> (raw)
In-Reply-To: <BYAPR11MB314345496165731C1DD80B4AD7610@BYAPR11MB3143.namprd11.prod.outlook.com>


> >
> > Hi.
> Hey,
> > In DPDK 19.11, the lcore_config struct of <rte_lcore.h> is made
> > private, and with it the possibility to look up the thread id of the
> > lcore worker threads disappears.
> >
> > One use case is an application with a monitoring function (on some
> > control plane thread), which uses the thread ids to make sure the
> > worker threads gets the CPU runtime they should, and thus is able to
> > detect stalls.
This sounds similar to 'keep alive' functionality.

> >
> > Is there some other way of finding out the thread_id of a lcore worker
> > thread? All I can think of are hacks like using a temporary service
> > function for service cores, in combination with requiring launched
> > application threads also to store their thread id in some global
> > structure (index by lcore_id).
> -1 for the service cores idea. I like the creative solution thinking, but not as a
> long-term solution.
> > Is there some cleaner way? If not, would adding something like a
> > rte_lcore_thread_id() function make sense?
I guess here you mean the OS provided thread ID. Are there OS calls that provide the CPU runtime?

> I think given your use-case description above, this makes sense.
> I guess it comes down to a discussion around if thread_id should be exposed
> at all - but given you have a use I'd argue yes it should.
> Doing so in a cross-platform way might be a bit tricky though.
> > Regards,
> >      Mattias
> Regards, -Harry

  reply	other threads:[~2020-07-14 19:00 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-14 12:03 Mattias Rönnblom
2020-07-14 13:08 ` Van Haaren, Harry
2020-07-14 18:59   ` Honnappa Nagarahalli [this message]
2020-07-14 20:51     ` Stephen Hemminger
2020-07-15 10:17       ` Mattias Rönnblom
2020-07-15 16:21         ` Stephen Hemminger
2020-07-16 10:20           ` Mattias Rönnblom
2020-08-10  9:36             ` [dpdk-dev] [RFC] eal: introduce function to get lcore " Mattias Rönnblom
2020-10-20 13:38               ` David Marchand
2020-10-20 18:40                 ` Mattias Rönnblom
2020-07-15 10:21   ` [dpdk-dev] Retrieving lcore worker " Mattias Rönnblom

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