Re: [PATCH 05/37] perf tools: Create separate mmap for dummy tracking event
From: Namhyung Kim
Date: Sat Dec 27 2014 - 00:32:41 EST
On Sat, Dec 27, 2014 at 1:51 AM, David Ahern <dsahern@xxxxxxxxx> wrote:
> On 12/24/14 12:15 AM, Namhyung Kim wrote:
>> When multi file support is enabled, a dummy tracking event will be
>> used to track metadata (like task, comm and mmap events) for a session
>> and actual samples will be recorded in separate files.
>> Provide separate mmap to the dummy tracking event. The size is fixed
>> to 128KiB (+ 1 page) as the event rate will be lower than samples. I
> Have you tried stress tests like a kernel compile with -j Ncpus (Ncpus = 16
> or higher)?
Yep, the test results in the cover letter were recorded kernel build
with -j 20 on my development machine.
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