linux-kernel - Re: [PATCH v3 10/11] perf tools report: Implement browsing of individual samples

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Message-ID: <20190304144755.GF30476@krava>
Date:   Mon, 4 Mar 2019 15:47:55 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3 10/11] perf tools report: Implement browsing of
 individual samples

On Thu, Feb 28, 2019 at 10:35:49AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Now 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.

I'm getting this error for workload sampling:

File does not contain CPU events. Remove -C option to proceed.


jirka