Re: [PATCH v1 0/7] perf: Support multiple system call tables in the build

[Ian Rogers]

On Fri, Jan 31, 2025 at 11:15 PM Ian Rogers <irogers@xxxxxxxxxx> wrote:
>
> This work builds on the clean up of system call tables and removal of
> libaudit by Charlie Jenkins <charlie@xxxxxxxxxxxx>.
>
> The system call table in perf trace is used to map system call numbers
> to names and vice versa. Prior to these changes, a single table
> matching the perf binary's build was present. The table would be
> incorrect if tracing say a 32-bit binary from a 64-bit version of
> perf, the names and numbers wouldn't match.
>
> Change the build so that a single system call file is built and the
> potentially multiple tables are identifiable from the ELF machine type
> of the process being examined. To determine the ELF machine type, the
> executable's header is read from /proc/pid/exe with fallbacks to using
> the perf's binary type when unknown.
>
> Remove some runtime types used by the system call tables and make
> equivalents generated at build time.
>
> Ian Rogers (7):
>   perf syscalltble: Remove syscall_table.h
>   perf trace: Reorganize syscalls
>   perf syscalltbl: Remove struct syscalltbl
>   perf thread: Add support for reading the e_machine type for a thread
>   perf trace beauty: Add syscalltbl.sh generating all system call tables
>   perf syscalltbl: Use lookup table containing multiple architectures
>   perf build: Remove Makefile.syscalls

If you are looking for the improvement this series achieves, patch 6
has sample before and after output:
https://lore.kernel.org/lkml/20250201071455.718247-7-irogers@xxxxxxxxxx/

Thanks,
Ian