Date: Sun, 3 Sep 2023 08:56:32 +0100 From: Graham Perrin <grahamperrin@gmail.com> To: Mateusz Guzik <mjguzik@gmail.com> Cc: FreeBSD-CURRENT <freebsd-current@freebsd.org> Subject: Re: kernel 100% CPU Message-ID: <79114b6f-9fe1-2e76-55be-a27cf8c178bf@gmail.com> In-Reply-To: <CAGudoHEhNG2e2J7Cb2w0EKZ7p_cdq0hie_s67AHCj7x8hfw8SA@mail.gmail.com> References: <95e9f65b-58c4-ef3a-a5d1-b794179e4252@gmail.com> <CAGudoHG%2B4wT-MCP=zE4VqdJYJwTKSLf8GfARvQbGwKZw%2Bz8F_g@mail.gmail.com> <d2e5951a-7c6c-f450-eacc-d8e4f6446118@gmail.com> <CAGudoHEhNG2e2J7Cb2w0EKZ7p_cdq0hie_s67AHCj7x8hfw8SA@mail.gmail.com>
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On 02/09/2023 18:31, Mateusz Guzik wrote:
> Looks like you have a lot of unrelated traffic in there.
>
> Run this script:
> #pragma D option dynvarsize=32m
>
> profile:::profile-997
> /execname == "find"/
> {
> @oncpu[stack(), "oncpu"] = count();
> }
>
> /*
> * The p_flag & 0x4 test filters out kernel threads.
> */
>
> sched:::off-cpu
> /execname == "find"/
> {
> self->ts = timestamp;
> }
>
> sched:::on-cpu
> /self->ts/
> {
> @offcpu[stack(30), "offcpu"] = sum(timestamp - self->ts);
> self->ts = 0;
> }
>
> dtrace:::END
> {
> normalize(@offcpu, 1000000);
> printa("%k\n%s\n%@d\n\n", @offcpu);
> printa("%k\n%s\n%@d\n\n", @oncpu);
> }
>
> dtrace -s script.d -o out
# pwd
/home/grahamperrin/Documents/IT/BSD/FreeBSD/kernel-cpu
# ./2023-09-02-18-31.sh
./2023-09-02-18-31.sh: profile:::profile-997: not found
./2023-09-02-18-31.sh: /execname: not found
./2023-09-02-18-31.sh: 6: Syntax error: "(" unexpected (expecting "}")
# whoami
root
# echo $
$
# echo $0
sh
# echo $SHELL
/bin/csh
# exit
root@mowa219-gjp4-8570p-freebsd:/home/grahamperrin/Documents/IT/BSD/FreeBSD/kernel-cpu
#
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