> * Miklos Szeredi <[email protected]> wrote:
>
> > When writing a big file to a ubd disk, everything in uml slows down to
> > a crawl, even though CPU usage is minimal.
> >
> > So I wanted to try the latency tracer from -rt, but it doesn't compile
> > with UML:
>
> note that there are standalone patches as well:
>
> http://people.redhat.com/mingo/latency-tracing-patches/
>
> so there's no forced need to use -rt.
Ah, forgotten about that.
Unfortunately the latency tracer patch doesn't compile either:
CC kernel/latency_trace.o
kernel/latency_trace.c:28:21: error: asm/rtc.h: No such file or directory
kernel/latency_trace.c:63:3: error: #error Implement cycles_to_usecs.
kernel/latency_trace.c: In function ‘____trace’:
kernel/latency_trace.c:658: error: implicit declaration of function ‘irqs_disabled_flags’
make[1]: *** [kernel/latency_trace.o] Error 1
Miklos
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