Re: [PATCH v6 7/7] perf diff: Support hot streams comparison

From: Jin, Yao
Date: Sat Sep 19 2020 - 00:43:06 EST

Hi Arnaldo,

On 9/18/2020 4:26 AM, Arnaldo Carvalho de Melo wrote:
Em Fri, Sep 11, 2020 at 04:03:53PM +0800, Jin Yao escreveu:
This patch enables perf-diff with "--stream" option.

"--stream": Enable hot streams comparison

Now let's see examples.

perf record -b ... Generate with branch data
perf record -b ... Generate with branch data
perf diff --stream

[ Matched hot streams ]

hot chain pair 1:
cycles: 1, hits: 27.77% cycles: 1, hits: 9.24%
--------------------------- --------------------------
main div.c:39 main div.c:39
main div.c:44 main div.c:44

hot chain pair 2:
cycles: 34, hits: 20.06% cycles: 27, hits: 16.98%
--------------------------- --------------------------
__random_r random_r.c:360 __random_r random_r.c:360

Would it be interesting to get the associated source code and show right below
these file:number lines?

- Arnaldo

I'm thinking we can implement this function in callchain_list__sym_name(), and then all callchain functionality will benefit from it. While that looks to be another patchset. :)

Jin Yao