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Date: Tue, 09 Jan 2024 17:04:54 -0800
From: Kees Cook <kees@kernel.org>
To: Arnaldo Carvalho de Melo <arnaldo.melo@gmail.com>
CC: linux-perf-users <linux-perf-users@vger.kernel.org>
Subject: Re: Getting PMU stats on specific syscalls
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On January 9, 2024 3:30:32 PM PST, Arnaldo Carvalho de Melo <arnaldo=2Emel=
o@gmail=2Ecom> wrote:
>On Tue, Jan 9, 2024, 7:55 PM Kees Cook <keescook@chromium=2Eorg> wrote:
>
>> Hi,
>>
>> I'd like to get PMU stats only on specific syscalls=2E I haven't been a=
ble
>> to figure this out=2E i=2Ee=2E how do I run:
>>
>>         perf stat -e some_syscall_name_here make -j128
>>
>>
>>
>> Try with the technique described here:
>>
>
>https://www=2Espinics=2Enet/lists/linux-perf-users/msg09253=2Ehtml
>
>Using the syscalls:sys_enter_syscall_name and
>syscalls:sys_exit_syscall_name as on off switches=2E

Yeah, I can get walk-clock time, but I'm trying to get much more detailed =
stats (cache hits, cycle counts, etc)=2E

It seems I can only get PMU counts from a whole process=2E I was hoping to=
 avoid creating a synthetic workload that only exercises the one syscall an=
d instead get a view of the PMU counters under a real load but only for the=
 duration of the syscall=2E=2E=2E

--=20
Kees Cook