linux-kernel - Re: [FYI][PATCH 1/1] tools headers UAPI: Sync powerpc syscall table file changed by new futex

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Date:   Fri, 26 Nov 2021 15:19:32 +0530
From:   Athira Rajeev <atrajeev@...ux.vnet.ibm.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     André Almeida <andrealmeid@...labora.com>,
        Arnd Bergmann <arnd@...db.de>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [FYI][PATCH 1/1] tools headers UAPI: Sync powerpc syscall table
 file changed by new futex_waitv syscall



> On 26-Nov-2021, at 2:12 AM, Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> 
> To pick the changes in this cset:
> 
>  a0eb2da92b715d0c ("futex: Wireup futex_waitv syscall")
> 
> That add support for this new syscall in tools such as 'perf trace'.
> 
> For instance, this is now possible (adapted from the x86_64 test output):
> 
>  # perf trace -e futex_waitv
>  ^C#
>  # perf trace -v -e futex_waitv
>  event qualifier tracepoint filter: (common_pid != 807333 && common_pid != 3564) && (id == 449)
>  ^C#
>  # perf trace -v -e futex* --max-events 10
>  event qualifier tracepoint filter: (common_pid != 812168 && common_pid != 3564) && (id == 221 || id == 449)
>  mmap size 528384B
>           ? (         ): Timer/219310  ... [continued]: futex())                                            = -1 ETIMEDOUT (Connection timed out)
>       0.012 ( 0.002 ms): Timer/219310 futex(uaddr: 0x7fd0b152d3c8, op: WAKE|PRIVATE_FLAG, val: 1)           = 0
>       0.024 ( 0.060 ms): Timer/219310 futex(uaddr: 0x7fd0b152d420, op: WAIT_BITSET|PRIVATE_FLAG, utime: 0x7fd0b1657840, val3: MATCH_ANY) = 0
>       0.086 ( 0.001 ms): Timer/219310 futex(uaddr: 0x7fd0b152d3c8, op: WAKE|PRIVATE_FLAG, val: 1)           = 0
>       0.088 (         ): Timer/219310 futex(uaddr: 0x7fd0b152d424, op: WAIT_BITSET|PRIVATE_FLAG, utime: 0x7fd0b1657840, val3: MATCH_ANY) ...
>       0.075 ( 0.005 ms): Web Content/219299 futex(uaddr: 0x7fd0b152d420, op: WAKE|PRIVATE_FLAG, val: 1)     = 1
>       0.169 ( 0.004 ms): Web Content/219299 futex(uaddr: 0x7fd0b152d424, op: WAKE|PRIVATE_FLAG, val: 1)     = 1
>       0.088 ( 0.089 ms): Timer/219310  ... [continued]: futex())                                            = 0
>       0.179 ( 0.001 ms): Timer/219310 futex(uaddr: 0x7fd0b152d3c8, op: WAKE|PRIVATE_FLAG, val: 1)           = 0
>       0.181 (         ): Timer/219310 futex(uaddr: 0x7fd0b152d420, op: WAIT_BITSET|PRIVATE_FLAG, utime: 0x7fd0b1657840, val3: MATCH_ANY) ...
>  #
> 
> That is the filter expression attached to the raw_syscalls:sys_{enter,exit}
> tracepoints.
> 
>  $ grep futex tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
>  221	32	futex				sys_futex_time32
>  221	64	futex				sys_futex
>  221	spu	futex				sys_futex
>  422	32	futex_time64			sys_futex			sys_futex
>  449	common  futex_waitv                     sys_futex_waitv
>  $
> 

Hi Arnaldo,

I checked this in powerpc by using :
perf trace -v -e futex_waitv 
And also using functional selftest from 'tools/testing/selftests/futex/functional/futex_waitv’, to make sure ‘futex_waitv’ comes in the perf trace result.

Just a minor suggestion change. Below warning mentioned in this patch is for s390. But I verified that this patch fixes the perf build warning in powerpc also. So would be good to put the warning logs for powerpc:

Warning: Kernel ABI header at 'tools/perf/arch/powerpc/entry/syscalls/syscall.tbl' differs from latest version at 'arch/powerpc/kernel/syscalls/syscall.tbl'
diff -u tools/perf/arch/powerpc/entry/syscalls/syscall.tbl arch/powerpc/kernel/syscalls/syscall.tbl

Reviewed-and-Tested-by: Athira Rajeev <atrajeev@...ux.vnet.ibm.com>

Thanks
Athira

> This addresses this perf build warnings:
> 
>  Warning: Kernel ABI header at 'tools/perf/arch/s390/entry/syscalls/syscall.tbl' differs from latest version at 'arch/s390/kernel/syscalls/syscall.tbl'
>  diff -u tools/perf/arch/s390/entry/syscalls/syscall.tbl arch/s390/kernel/syscalls/syscall.tbl
> 
> Cc: AndrÃ© Almeida <andrealmeid@...labora.com>
> Cc: Arnd Bergmann <arnd@...db.de>
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> ---
> tools/perf/arch/powerpc/entry/syscalls/syscall.tbl | 1 +
> 1 file changed, 1 insertion(+)
> 
> diff --git a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
> index 7bef917cc84e6499..15109af9d0754d5f 100644
> --- a/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
> +++ b/tools/perf/arch/powerpc/entry/syscalls/syscall.tbl
> @@ -528,3 +528,4 @@
> 446	common	landlock_restrict_self		sys_landlock_restrict_self
> # 447 reserved for memfd_secret
> 448	common	process_mrelease		sys_process_mrelease
> +449	common  futex_waitv                     sys_futex_waitv
> -- 
> 2.31.1
> 
>