linux-kernel - [PATCH v1 0/5] perf trace: Cleanup and remove unused bpf map

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Date:   Mon, 21 Nov 2022 07:52:32 +0000
From:   Leo Yan <leo.yan@...aro.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ian Rogers <irogers@...gle.com>,
        linux-perf-users@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Leo Yan <leo.yan@...aro.org>
Subject: [PATCH v1 0/5] perf trace: Cleanup and remove unused bpf map

The initial purpose of this series is to cleanup the unused bpf map
'syscalls' in the eBPF program augmented_raw_syscalls and perf trace
tool.  The relality is perf trace tool initializes system call table
based on map 'syscalls' and wrongly returns syscall pointer for
non-existed system calls based on the previous initialization.

So the patch set firstly addresses the issue for handling non-existed
system calls, then it removes unused local variable and bpf map in
augmented_raw_syscalls.c.

Patch 01 is a minor refactoring to use macro to replace number, patch 02
is to return error if a system call doesn't exist, especially when we
cannot find corresponding trace point in sysfs node, patch 03 is to fix
the issue that trace__syscall_info() returns a syscall pointer even the
system call doesn't exist, the corrected result is to always return NULL
pointer for non-existed system call.

The last two patches remove the unused local variable and bpf map
'syscalls'.

This patch set has been tested with mainline kernel on Arm64 Ampere
Altra platform.

Leo Yan (5):
  perf trace: Use macro RAW_SYSCALL_ARGS_NUM to replace number
  perf trace: Return error if a system call doesn't exist
  perf trace: Handle failure when trace point folder is missed
  perf augmented_raw_syscalls: Remove unused variable 'syscall'
  perf trace: Remove unused bpf map 'syscalls'

 tools/perf/builtin-trace.c                    | 131 +++---------------
 .../examples/bpf/augmented_raw_syscalls.c     |  18 ---
 2 files changed, 18 insertions(+), 131 deletions(-)

-- 
2.34.1