Messages in this thread | | | Date | Fri, 1 Apr 2016 12:19:30 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [PATCH] perf tools: Add sample types for bpf-output event |
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Em Fri, Apr 01, 2016 at 12:16:10PM -0300, Arnaldo Carvalho de Melo escreveu: > Perhaps, to make all more familiar we could even define equivalents to > stdio.h functions like puts, printf, fputs, etc, that would send to this > bpf-output based "stdout" "channel", then the above would end up being: > > func(void *ctx, int type) > { > char err_str[] = "BAD %d\n"; > int err; > > err = puts("Raise a BPF event!"); > if (err) > trace_printk(err_str, sizeof(err_str), err); > return 1; > } > > This trace_printk() in turn could become error() (glibc's error.h header), i.e. > the error mechanism would use the equivalent to userland's "syslog", i.e. > trace_printk :-) > > In general trying to make BPF C scriptlets fed via perf to be as compact as > possible, hiding all these details while allowing them to be used, if desired.
One extra possibility would be that it would look so much like a user space C program that we could test it without loading it to the kernel, with just building it with a different header and feeding it data as it would get inside the kernel :-)
- Arnaldo
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