Linux em tempo real
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Linux em tempo real

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Atualmente, o Linux vem sendo utilizado como sistema operacional de tempo real, tanto ...

Atualmente, o Linux vem sendo utilizado como sistema operacional de tempo real, tanto
comercialmente quando academicamente. Esta apresentação introduz os conceitos básicos do Linux em tempo real, fazendo um paralelo com a teoria de sistemas de tempo real. Das implementações do kernel do Linux com características de tempo real, duas são apresentadas: o PREEMPT_RT, a alternativa comercial, e o LitmusRT, a alternativa acadêmica. Para cada implementação, são apresentados detalhes de sua implementação e exemplos de pesquisas que estão sendo desenvolvidas atualmente nestes sistemas.

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    Linux em tempo real Linux em tempo real Presentation Transcript

    • SECCOM 2013 Real-Time Linux Daniel Bristot de Oliveira daniel@bristot.eti.br bristot@OFTC / #linux-rt
    • Who I'm and what we will talk about?
    • What does Real-Time means?
    • Event -> Response, latency, response time, deadline...
    • Real-Time means fast?
    • Real Time != FAST!
    • RT means Determinism, WCET, Response Time.
    • How Red Hat shows your Real-Time Linux
    • What is a Real-Time Operating System?
    • Real-Time Operating System Examples
    • Why Linux is not a RTOS?
    • Real-Time Linux: Past, Present, Possible Futures...
    • RTAI and Xenomai
    • RT Task on Xenomai + Non-RT on Linux... = ):) <- this is a bipolar emoticon
    • PREEMPT-RT
    • - latency + control over OS tasks
    • Preemptive lock
    • Priority inversion problems...
    • PREMPT-RT is WONDERFULL! Let's use everywhere!!!
    • ) :) This is another bipolar emoticon, but more happy than another...
    • How expensive is PREEMP-RT?
    • 50 45 40 35 CPU Load (%) 30 PREEMPT-RT Vanilla 25 20 15 10 5 0 12 24 36 Concurrent channels 60
    • LITMUS RT
    • A testbed for multiprocessor scheduling in Real-Time Systems
    • (Partitioned|Global|Clustered) EDF Partitioned Fixed-Priority PD2 (PFAIR)
    • Mutual Exclusion Interrupt Handling Real-Time GPU Management Tracing Tools
    • What about SCHED_DEADLINE?
    • Research Opportunities
    • Questions?