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SubjectRe: -rt doesn't compile for UML
> * Miklos Szeredi <> 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:
> 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

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