linux-kernel - Re: [PATCH] perf report: Skip symbols for idle symbols

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Date:   Tue, 18 Oct 2022 14:54:07 +0200
From:   Rafał Miłecki <zajec5@...il.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Rafał Miłecki <rafal@...ecki.pl>
Subject: Re: [PATCH] perf report: Skip symbols for idle symbols

On 8.06.2022 07:51, Rafał Miłecki wrote:
> From: Rafał Miłecki <rafal@...ecki.pl>
> 
> Displaying idle symbols is rather useless and makes reviewing "real"
> symbols harder. perf top already skips them so perf report should
> probably do the same.
> 
> BEFORE
> 
> # Overhead  Command          Shared Object          Symbol
> # ........  ...............  .....................  ...................................
> #
>      75.04%  swapper          [kernel.kallsyms]      [k] arch_cpu_idle
>       1.05%  ksoftirqd/0      [kernel.kallsyms]      [k] __pi___inval_dcache_area
>       0.78%  ksoftirqd/0      [kernel.kallsyms]      [k] __netif_receive_skb_core
>       0.75%  ksoftirqd/0      [kernel.kallsyms]      [k] fib_table_lookup
>       0.58%  ksoftirqd/0      [kernel.kallsyms]      [k] __dev_queue_xmit
>       0.56%  ksoftirqd/0      [kernel.kallsyms]      [k] bcm4908_enet_start_xmit
>       0.55%  ksoftirqd/0      [kernel.kallsyms]      [k] __skb_flow_dissect
>       0.53%  ksoftirqd/0      [kernel.kallsyms]      [k] __pi___clean_dcache_area_poc
> 
> AFTER
> 
> # Overhead  Command          Shared Object          Symbol
> # ........  ...............  .....................  ...................................
> #
>       4.21%  ksoftirqd/0      [kernel.kallsyms]      [k] __pi___inval_dcache_area
>       3.13%  ksoftirqd/0      [kernel.kallsyms]      [k] __netif_receive_skb_core
>       3.01%  ksoftirqd/0      [kernel.kallsyms]      [k] fib_table_lookup
>       2.32%  ksoftirqd/0      [kernel.kallsyms]      [k] __dev_queue_xmit
>       2.23%  ksoftirqd/0      [kernel.kallsyms]      [k] bcm4908_enet_start_xmit
>       2.21%  ksoftirqd/0      [kernel.kallsyms]      [k] __skb_flow_dissect
>       2.13%  ksoftirqd/0      [kernel.kallsyms]      [k] __pi___clean_dcache_area_poc
>       2.00%  ksoftirqd/0      [kernel.kallsyms]      [k] eth_type_trans
>       1.86%  ksoftirqd/0      [kernel.kallsyms]      [k] bcm4908_enet_poll_rx
>       1.73%  ksoftirqd/0      [kernel.kallsyms]      [k] __local_bh_enable_ip
>       1.63%  ksoftirqd/0      [kernel.kallsyms]      [k] fib_rules_lookup
>       1.61%  ksoftirqd/0      [kernel.kallsyms]      [k] bcm4908_enet_poll_tx
>       (...)
> 
> Signed-off-by: Rafał Miłecki <rafal@...ecki.pl>

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