• Andi Kleen's avatar
    perf report: Implement browsing of individual samples · 4968ac8f
    Andi Kleen authored
    Now 'perf report' can show whole time periods with 'perf script', but
    the user still has to find individual samples of interest manually.
    
    It would be expensive and complicated to search for the right samples in
    the whole perf file. Typically users only need to look at a small number
    of samples for useful analysis.
    
    Also the full scripts tend to show samples of all CPUs and all threads
    mixed up, which can be very confusing on larger systems.
    
    Add a new --samples option to save a small random number of samples per
    hist entry.
    
    Use a reservoir sample technique to select a representatve number of
    samples.
    
    Then allow browsing the samples using 'perf script' as part of the hist
    entry context menu. This automatically adds the right filters, so only
    the thread or cpu of the sample is displayed. Then we use less' search
    functionality to directly jump the to the time stamp of the selected
    sample.
    
    It uses different menus for assembler and source display.  Assembler
    needs xed installed and source needs debuginfo.
    
    Currently it only supports as many samples as fit on the screen due to
    some limitations in the slang ui code.
    Signed-off-by: default avatarAndi Kleen <ak@linux.intel.com>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Link: http://lkml.kernel.org/r/20190311174605.GA29294@tassilo.jf.intel.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    4968ac8f
scripts.c 4.3 KB